CBSE Class 10CBSE
Account
It's free!

User


Login
Register


      Forgot password?
Share
Notifications

View all notifications
Books Shortlist
Your shortlist is empty

Lakhmir Singh solutions Biology for Class 10 (2019 Exam) chapter 2 Control and Coordination

Chapters

Lakhmir Singh Solutions for Physics for Class 10 (2019 Exam)

Lakhmir Singh Biology Class 10 (2019 Exam)

Biology for Class 10 (2019 Exam)

Chapter 2 - Control and Coordination

Pages 92 - 98

What is the general name of chemical substances which bring about control and coordination in plants?

Q 1 | Page 92

Which plant hormone is responsible for the wilting and falling of leaves?

Q 2 | Page 92

 What does a tendril do in response to the touch of a support? What is this phenomenon known as?

Q 2.3 | Page 93

Which plant hormone makes a stem (or shoot) bend towards light?

Q 3 | Page 92

Where is the auxin hormone made in a plant stem?

Q 4 | Page 92

What is the scientific name of sensitive plant?

 
Q 5 | Page 92

Name one plant hormone that promotes growth and another plant hormone which inhibits growth.

Q 6 | Page 92

Name one example of the movement of a plant part which is very quick and can be observed easily.

Q 7 | Page 92

Name the type of chemical substances that control the growth in plants.

Q 8 | Page 92

What is the stimulus in phototropism?

Q 9.1 | Page 92

What is the stimulus in geotropism?

Q 9.2 | Page 92

What is the stimulus in  chemotropism?

Q 9.3 | Page 92

What is the stimulus in hydrotropism? 

Q 9.4 | Page 92

What is the stimulus in thigmotropism?

Q 9.5 | Page 92

Give the scientific terms used to represent the  Bending of a shoot towards light.

Q 10.1 | Page 92

Give the scientific terms used to represent the Growing of roots towards the earth.

Q 10.2 | Page 92

Give the scientific terms used to represent the Growth of a pollen tube towards ovule.

Q 10.3 | Page 92

Give the scientific terms used to represent the Bending of roots towards water.

Q 10.4 | Page 92

Give the scientific terms used to represent the Winding of tendril around a support.

Q 10.5 | Page 92

Give one example of the movement of a plant part which is caused by the loss of water (or migration of water).

Q 11 | Page 93

Give one example of a plant part which is positively hydrotropic as well as positively geotropic.

Q 12.1 | Page 93

Give one example of a plant part which is positively phototropic but negatively geotropic.

Q 12.2 | Page 93

Which of the following is a growth movement and which is not?
(a) folding up of leaves of sensitive plant on touching with hand.
(b) folding up of petals of dandelion flower when light fades.

Q 13 | Page 93

Name the plant part  which bends in the direction of gravity but away from light

Q 14.1 | Page 93

Name the plant part which bends towards light but away from the force of gravity

Q 14.2 | Page 93

To which directional stimuli do roots respond?

Q 15.1 | Page 93

To which directional stimuli do shoots respond?

Q 15.2 | Page 93

Fill in the following blank :

 A plant's response to light is called ..........

Q 16.1 | Page 93

Fill in the following blank:

A plant's response to gravity is called ........

Q 16.2 | Page 93

Fill in the following blank:                                                                                 Plant shoot grows upward in response to .......

Q 16.3 | Page 93

Fill in the following blank : Plant roots grow downward in response to ........

Q 16.4 | Page 93

Fill in the following blank:

Tendrils wind around a support in response to .......

Q 16.5 | Page 93

Fill in the following blanks :

Plant roots grow towards........ and in the direction of force of .........

Q 16.6 | Page 93

Fill in the following blank :

A root of a plant grows downward. This is known as ........

Q 16.7 | Page 93

Fill in the following blank :

 ...... is the hormone that causes phototropism in plants

Q 16.8 | Page 93

Fill in the following blank:

The response of leaves to the sunlight is called ..........

Q 16.9 | Page 93

Plant parts show two types of movements, one dependent on growth and other independent of growth Give one example  which depends on growth

Q 17.1 | Page 93

Plant parts show two types of movements, one dependent on growth and other independent of growth. Give one example  which does not depend on growth

Q 17.2 | Page 93

What is a plant hormone? Name four plant hormones. State one function of each.

Q 18 | Page 93

What does a root do in response to gravity? What is this phenomenon known as?

Q 19.1 | Page 93

What does a stem (or shoot) do in response to light? What is this phenomenon known as?

Q 19.2 | Page 93

What does a stem (or shoot) do in response to gravity? What is this phenomenon known as?

Q 20.1 | Page 93

What does a root do in response to light? What is this phenomenon known as?

Q 20.2 | Page 93

What does a Mimosa pudica plant do in response to touch? What is this phenomenon known as?

Q 21.1 | Page 93

What happens to the dandelion flower (i) during daytime, and (ii) at night? What is this phenomenon known as?

Q 21.2 | Page 93

What does a plant root do in response to water? What is this phenomenon known as?

Q 22.1 | Page 93

What happens to the moonflower (i) during daytime, and (ii) at night? What is this phenomenon known as?

Q 22.2 | Page 93

What is a tendril?

Q 23.1 | Page 93

Name the two types of tendrils.

Q 23.2 | Page 93

Name the five types of tropisms.

Q 24.1 | Page 93

How are tropic movements helpful to plants? Explain with an example.

Q 24.2 | Page 93

Define chemotropism.

Q 25.1 | Page 93

Give one example of chemotropism. State whether this example is of positive chemotropism or negative chemotropism.

Q 25.2 | Page 93

Distinguish between tropic movements and nastic movements in plants. Give examples to illustrate your answer.

Q 26 | Page 93

What is meant by nastic movements in plants? Give one example of nastic movements in plants.

Q 27.1 | Page 93

 What is the difference between photonasty and thigmonasty?

Q 27.2 | Page 93

A potted plant is kept horizontally for a considerable time. The three positions of the parts A and B of the potted plant are shown in the following figures :

(a) Which figure shows the correct position taken by the parts A and B of the plant?
(b) What type of phenomenon is exhibited by the figure chosen in (a) above?

Q 28 | Page 94

Name the plant hormones which is responsible for the following effect :
opening of stomata

Q 29.2 | Page 94

Name the plant hormones which are responsible for the following effect :
bending of stem towards light

Q 29.3 | Page 94

Name the plant hormones which are responsible for the following effect:
closing of stomata

Q 29.4 | Page 94

Name the plant organ which is positively phototropic.

Q 30.1 | Page 94

Name the plant organ which is positively geotropic

Q 30.2 | Page 94

Name the plant organ which is negatively geotropic

Q 30.3 | Page 94

Name the plant organ which is positively hydrotropic

Q 30.4 | Page 94

Why is the folding up of the leaves of a sensitive plant on touching with a finger not a tropism?

Q 31 | Page 94

Why is the closing of a dandelion flower at dusk (when it gets dark) not a tropism?

Q 32 | Page 94

What is meant by 'tropisms' (or tropic movements)? Explain with an example.

Q 33.1 | Page 94

What are the different types of tropisms? Define each type of tropism. Write the name of stimulus in each case

Q 33.2 | Page 94

Define phototropism. Give one example of phototropism.

Q 34.1 | Page 94

How does phototropism occur in a plant stem (or shoot)? Explain with the help of labelled diagrams.

Q 34.2 | Page 94

What is meant by positive phototropism and negative phototropism? Give one example of each type.

Q 34.3 | Page 94

Define geotropism. Give one example of geotropism.

Q 35.1 | Page 94

What is meant by 'positive geotropism' and 'negative geotropism? Give one example of each type. Draw a labelled diagram to illustrate your answer indicating the plant part which shows positive geotropism and the plant part which shows negative geotropism.

Q 35.2 | Page 94

Name one plant part which exhibits positive thigmotropism.

Q 35.3 | Page 94

How does control and coordination take place in plants? How does it differ from that in animals?

Q 36.1 | Page 94

Name five stimuli which act on plants. Name the type of tropism produced by each one of these stimuli.

Q 36.2 | Page 94

 Define hydrotropism. Give one example of hydrotropism. State whether this example is of positive hydrotropism or negative hydrotropism. Illustrate your answer with the help of labelled diagram.

Q 36.3 | Page 94

What is meant by positive tropism and negative tropism? Explain with examples.

Q 37.1 | Page 94

Define thigmotropism. Give one example of thigmotropism.

Q 37.2 | Page 94

 What is the difference between thigmotropism and thigmonasty? Name one plant which exhibits thigmotropism and one plant which exhibits thigmonasty. What behaviour (or responses) of these plants make you think that they exhibit thigmotropism and thigmonasty respectively?

Q 37.3 | Page 94

Which of the following is not a plant hormone?
(a) auxin
(b) ascorbic acid
(c) cytokinin
(d) abscisic acid

Q 38 | Page 94

One of the following plant hormones is responsible for the phenomenon of phototropism in plants. This is :
(a) gibberellin
(b) eltroxin
(c) cytokinin
(d) auxin

Q 39 | Page 94

The movement of a plant part in response to the force of attraction exerted by the earth is called :
(a) hydrotropism
(b) geotropism
(c) chemotropism
(d) phototropism

Q 40 | Page 94

The movement of sunflower in accordance with the path of the sun is due to :
(a) photonasty
(b) phototropism
(c) hydrotropism
(d) chemotropism

Q 41 | Page 95

The plant part which exhibits negative geotropism is :
(a) root
(b) stem
(c) branch
(d) leaves

Q 42 | Page 94

A big tree falls in a forest but its roots are still in contact with the soil.
The branches of this fallen tree grow straight up (vertically). This happens in response to
(a) water and light
(b) water and minerals
(c) gravity and water
(d) light and gravity

Q 43 | Page 95

Which of the following is not caused by a growth movement?
(a) bending of the shoot of a plant in response to light
(b) closing up of leaves of a sensitive plant on touching with an object
(c) climbing up of a plant on an object by using tendrils
(d) movement of the root of a plant towards a source of water

Q 44 | Page 95

The root of a plant is :
(i) positively phototropic but negatively geotropic
(ii) positively geotropic but negatively phototropic
(iii) negatively phototropic but positively hydrotropic
(iv) negatively hydrotropic but positively phototropic
(a) (i) and (ii)  (b) (ii) and (iii)  (c) (iii) and (iv)  (d) (i) and (

Q 45 | Page 95

The main function of the plant hormone called abscisic acid is to :
(a) increase the length of cells
(b) promote cell division
(c) inhibit growth
(d) promote growth of stem and roots

Q 46 | Page 95

The growth of tendrils in pea plants is due to the :

(a) effect of sunlight on the tendril cells facing the sun
(b) effect of gravity on the part of tendril hanging down towards the earth
(c) rapid cell division and elongation in tendril cells that are away from the support
(d) rapid cell division and elongation in tendril cells in contact with the support

Q 47 | Page 95

Which of the following phytohormone is not associated with the promotion of growth in plants?
(a) auxin
(b) abscisic acid
(c) gibberellin
(d) cytokinin

Q 48 | Page 95

The plant hormone which triggers the fall of mature leaves and fruits from the plant body is :
(a) auxin
(b) gibberellin
(c) abscisic acid
(d) cytokinin

Q 49 | Page 95

Which of the following terms denotes the movement of the root of a plant towards moisture in the soil?
(a) thigmotropism
(b) chemotropism
(c) hydrotropism
(d) geotropism

Q 50 | Page 95

The growth of a pollen tube towards the ovule caused by a sugary substance as stimulus is an example of :
(a) phototropism
(b) chlorotropism
(c) gravitropism
(d) chemotropism

Q 51 | Page 95

The bending of the shoot of a plant in response to light is called :
(a) geotropism
(b) phototropism
(c) thigmotropism
(d) photonasty

Q 52 | Page 95

The stimulus in the process of thigmotropism is :
(a) touch
(b) gravity
(c) light
(d) chemical

Q 53 | Page 95

A growing seedling is kept in a dark room. A burning candle is placed near it for a few days. The top part of seedling bends towards the burning candle. This is an example of :
(a) chemotropism
(b) hydrotropism
(c) phototropism
(d) geotropism

Q 54 | Page 95

Which of the following acts as a stimulus in the process of hydrotropism?
(a) hydrocarbon
(b) hydrogen oxide
(c) hydrogen chloride
(d) hydrogen peroxide

Q 55 | Page 95

The growth movement of a plant part in response to the touch of an object is called :
(a) thigmonasty
(b) hydrotropism
(c) thigmotropism
(d) geotropism

Q 56 | Page 95

The climbing organs of plants like tendrils grow towards any support which they happen to touch and wind around the support. This is an example of :
(a) chemotropism
(b) nastic movement
(c) thigmotropism
(d) geotropism

Q 57 | Page 96

The rate of growth in roots is decreased by one of the following plant hormones. This plant hormone is :
(a) gibberellin
(b) auxin
(c) cytokinin
(d) ethene

Q 58 | Page 96

When the leaves of a Mimosa pudicaplant are touched with a finger, they fold up quickly. This is an example of :
(a) chemotropism
(b) thigmonasty
(c) photonasty
(d) thigmotropism

Q 59 | Page 96

Dandelion flowers open the petals in bright light during the daytime but close the petals in dark at night. This response of dandelion flowers to light is called :
(a) phototropism
(b) thigmonasty
(c) chemotropism
(d) photonasty

Q 60 | Page 96

To which of the following directional stimulus roots of a plant do not respond?
(a) moisture
(b) candle light
(c) touch
(d) gravity

Q 61 | Page 96

One of the following is not caused by the growth related movement of the concerned plant part. This is :
(a) phototropism
(b) photonasty
(c) thigmonasty
(d) thigmotropism

Q 62 | Page 96

The bending of the root of a plant away from a source of light is caused by a plant hormone called :
(a) cytokinin
(b) gibberellin
(c) abscisic acid
(d) auxin

Q 63 | Page 96

Most of the plant hormones promote plant growth. A plant hormone which inhibits growth is :
(a) abscisic acid
(b) ethene
(c) ascorbic acid
(d) cytokinin

Q 64 | Page 96

The movement of a shoot towards light is :
(a) geotropism
(b) hydrotropism
(c) chemotropism
(d) phototropism

Q 65 | Page 96

The bending of the stem of a plant towards a source of light is caused by the action of a phytohormone known as :
(a) abscisic acid
(b) auxin
(c) gibberellins
(d) cytokinin

Q 66 | Page 96

Which of the following plant part exhibits negative phototropism?
(a) root
(b) branch
(c) leaves
(d) stem

Q 67 | Page 96

Which of the following are not tropisms?
(i) growing of pollen tube in response to a sugary substance
(ii) folding up of leaves of sensitive plant in response to touch
(iii) winding of tendril around a support in response to touch
(iv) opening up of the leaves of a daisy flower in response to light
(a) (i) and (ii)  (b) (ii) and (iii)  (c) (i) and (iv)  (d) (ii) and (iv)

Q 68 | Page 96

The chemical substance P is made and secreted by the meristematic tissue at the tip of stem (or shoot) of a plant. The chemical substance P is responsible for a phenomenon Q in plants in which the stem bends towards a source of light. The same chemical substance P has an opposite effect on the root of a plant. It causes the root of a plant to bend away from the source of light in a process called R.
(a) What is the chemical substance P?
(b) State whether P prefers to remains in the sunlit side of a stem or in shade.
(c) What is the effect of substance P on the rate of growth of (i) a root, and (ii) a stem?
(d) What is the name of process (i) Q, and (ii) R?
(e) What is the general name of chemical substances like P? Name another substance which belongs to this class of chemical substances.

Q 69 | Page 96

A potted plant is growing in a transparent glass jar. In this plant, X and Y are the two growing parts having a lot of meristematic tissue. It is observed that the part X of this plant exhibits positive geotropism but negative phototropism. On the other hand, part Y of this plant exhibits negative geotropism but positive phototropism.
(a) Name the part X of plant.
(b) Name the part Y of plant.
(c) Which part of the plant, X or Y, will exhibit positive hydrotropism?
(d) Which part of the plant, X or Y, can have tendrils on it?
(e) Which phytohormone causes the part X to exhibit negative phototropism?

Q 70 | Page 96

There are three plants A, B and C. The flowers of plant A open their petals in bright light during the day but close them when it gets dark at night. On the other hand, the flowers of plant B open their petals at night but close them during the day when there is bright light. The leaves of plant C fold up and droop when touched with fingers or any other solid object.
(a) Name the phenomenon shown by the flowers of (i) plant A, and (ii) plant B.
(b) Name one flower each which behaves like the flower of (i) plant A, and (ii) plant B.
(c) Name the phenomenon exhibited by the leaves of plant C.
(d) Name a plant whose leaves behave like those of plant C.
(e) Which plant/plants exhibit the phenomenon based on growth movements?

Q 71 | Page 97

While conducting experiments to study the effect of various stimuli on the plants, it was observed that the roots of a plant X grow and bend towards two stimuli A and B but bend away from a third stimulus C. The stem of the plant X, however, bends away from stimuli A and B but bends towards the stimulus C. The stimulus B is known to act on the roots due to too much weight of the earth. Keeping these points in mind, answer the following question :
(a) What could stimulus A be?
(b) Name the stimulus B.
(c) What could stimulus C be?
(d) The branches of a fallen tree in a forest grow straight up in response to two stimuli. What could be these two stimuli out of A, B and C? Also name these two stimuli.

Q 72 | Page 97

P and Q are two types of plants having weak stems which cannot stand upright on their own. The plants P and Q have organs R and S respectively which can grow towards any support which they happen to touch and wind around that support. It is observed that organ R originates from the leaves of the plant whereas organ S originates directly from the stem of the plant.
(a) What is (i) R, and (ii) S?
(b) What is the name of growth movement exhibited by the organs R and S?
(c) Name the stimulus involved in this case.
(d) State whether the behaviour of organs R and S is a tropic movement or a nastic movement.
(e) Name one plant like P and another plant like Q.

Q 73 | Page 97

The top part A of the flask-shaped reproductive organ X in the flower of a plant secrets a surgery substance into its lower part B which goes towards the bottom part C of the flask-shaped organ. When a tiny grain D coming from the top part E of another reproductive organ Y i the flower falls on part A, it grows a long tube F through the organ X i response to the sugary substance and reaches the bottom part C of flask-shaped organ to carry out fertilisation.
(a) Name parts (i) organ X, and (ii) organ Y, inside the flower?
(b) Name parts (i) A (ii) B, and (iii) C, of flask-shaped organ.
(c) Name (i) grain D, and (ii) part E of organ Y.
(d) Name the tube F.
(e) What is the phenomenon of growing a long tube in response to sugary substance in the process of fertilisation in a flower known as?

Q 74 | Page 97

P, Q, R and S are four major types of phytohormones. P is a phytohormone which functions mainly as a growth inhibitor. It promotes the wilting and falling of leaves. Q, R and S are phytohormones which all promote growth of plants in various ways. Q is responsible for the phenomenon of phototropism in plants. R is involved mainly in shoot extensions. The phytohormone S helps in breaking the dormancy of seeds and buds. What are P, Q, R and S? Give one reason each for your choice.

Q 75 | Page 97

A potted plant having straight parts A and B was placed horizontally on its side as shown in figure (i). After a few days it was observed that the parts A and B of the plant acquire new positions as shown in Figure (ii).
(a) Name the phenomenon exhibited by the position of plant parts A and B in Figure (ii)
(b) Name the stimulus (other than sunlight) which causes plant part A to grow and bend upwards, and plant part B to bend downwards.

Q 76 | Page 97

When the leaves of a sensitive plant are touched with a finger, they fold up and when light fades at dusk, the petals of a dandelion flower close.

State one way in which the above two processes are similar.

Q 77.1 | Page 98

When the leaves of a sensitive plant are touched with a finger, they fold up and when light fades at dusk, the petals of a dandelion flower close.

state two ways in which the above two processes differ.

Q 77.2 | Page 98

Pages 17 - 122

Name the two systems of control and coordination in higher animals.

Q 1 | Page 115

What are the two parts of the vertebrate nervous system?

Q 2 | Page 115

If we happen to touch a hot object unknowingly, we immediately pull back our hand. What is this type of action known as?

Q 3 | Page 115

Name the three components of a neuron (or nerve cell).

Q 4 | Page 115

 What are the short fibres of a neuron known as?

Q 5.1 | Page 115

What is the long fibre of a neuron known as?

Q 5.2 | Page 115

Name the most important part of the human brain.

Q 6 | Page 115

Which part of the brain maintains posture and equilibrium of the body?

Q 7 | Page 115

State one function each of cerebellum and pons.

Q 8 | Page 115

 Name one hormone secreted by the pituitary gland

Q 9 | Page 115

Where are hormones made in the human body?

Q 10 | Page 115

What is the name of the system of glands which produces hormones?

Q 11 | Page 115

Which gland secretes the growth hormone?

Q 12 | Page 115

Name the hormones secreted by testes.

Q 13.1 | Page 115

Name the hormones secreted by ovaries.

Q 13.2 | Page 115

What are the scientific names for the receptors in animals?

receptors for light

Q 14.1 | Page 115

What are the scientific names for the receptors in animals?

 receptors for heat

Q 14.2 | Page 115

What are the scientific names for the receptors in animals?

receptors for sound

Q 14.3 | Page 115

What are the scientific names for the receptors in animals?

 receptors for smell

Q 14.4 | Page 115

What are the scientific names for the receptors in animals?

 receptors for taste

Q 14.5 | Page 115

Name the disease caused by the deficiency of insulin hormone in the body.

Q 15 | Page 115

Name the disease caused by the deficiency of thyroxine hormone in the body.

Q 16 | Page 115

Which halogen element is necessary for the making of thyroxine hormone by the thyroid gland?

Q 17 | Page 115

Why are some patients of diabetes treated by giving injections of insulin?

Q 18 | Page 115

What is the name of in-built 'arrangement' in our body which controls the timing and amount of hormones released by various endocrine glands in the body?

Q 19 | Page 115

Name one gland  which acts only as an endocrine gland.

Q 20.1 | Page 115

Name one gland which acts only as an exocrine gland.

Q 20.2 | Page 115

Name one gland which acts both as an endocrine gland as well as an exocrine gland.

Q 20.3 | Page 115

What part does the diet play in helping us to have a healthy thyroid gland?

Q 21 | Page 115

If sugar is detected in the urine of a person, name the disease he is suffering from.

Q 22 | Page 115

Name two parts of the body which contain receptors of chemical stimuli.

Q 23 | Page 115

Which part of the eye contains cells which are sensitive to light?

Q 24 | Page 115

What are the two main communications systems in an animal's body?

Q 25 | Page 115

Which one term of the following includes the other three?
 thyroid, ductless gland, thymus, pituitary, ovary

Q 26.1 | Page 115

Which one term of the following includes the other three?
adrenalin, insulin, hormone, thyroxine, estrogen

Q 26.2 | Page 115

Which parts of the body form the central nervous system?

Q 27 | Page 115

Give three examples of reflex actions.

Q 28 | Page 115

Why do you need iodine in your diet?

Q 29 | Page 115

State whether coughing is a voluntary action or reflex action.

Q 30 | Page 115

Fill in the following blanks with suitable words :

The two examples of effectors are .........and ...........

Q 31.1 | Page 115

Fill in the following blanks with suitable words :

Our.............system allows us to react to our surroundings. Information from receptors passes along...........neurons to our brain. Our brain sends impulses along..........neurons to our muscles.

Q 31.2 | Page 115

Fill in the following blank with suitable word :

A neuron which carries an impulse to the brain is called a ........... neuron.

Q 31.3 | Page 115

Fill in the following blank with suitable word :

The neuron which carries a message for action to a muscle or gland is known as a......... neuron.

Q 31.4 | Page 115

What are the various sense organs in our body?

Q 32.1 | Page 116

What is meant by receptors and effectors? Give two examples of each.

Q 32.2 | Page 116

What is spinal cord? What is its main function?

Q 33.1 | Page 116

Give the functions of medulla.

Q 33.2 | Page 116

Name the three types of nerves which constitute the peripheral nervous system.

Q 34.1 | Page 116

What is the difference between a reflex action and walking?

Q 34.2 | Page 116

 How do we detect the smell of an agarbatti (incense stick)?

Q 34.3 | Page 116

What substances are made by endocrine glands?

Q 35.1 | Page 116

What is the function of receptors and effectors in our body?

Q 35.2 | Page 116

 Name the hormones secreted by given endocrine glands :

 Thyroid gland

Q 36.1 | Page 116

Name the hormones secreted by given endocrine glands :

Parathyroid glands

Q 36.2 | Page 116

Name the hormones secreted by given endocrine glands :

Pancreas

Q 36.3 | Page 116

Name the hormones secreted by given endocrine glands:

Adrenal glands

Q 36.4 | Page 116

Write the functions of testosterone and oestrogen hormones.

Q 36.5 | Page 116

 Write the names of the regions in hindbrain. Give one function of each region.

Q 37.1 | Page 116

Name the function of cerebrum.

Q 37.2 | Page 116

The human brain can be broadly divided into three regions. name these three regions.

Q 38.1 | Page 116

What is cranium? What is its function?

Q 38.2 | Page 116

How does chemical coordination take place in human beings?

Q 39.1 | Page 116

Why is the use of iodised salt advisable?

Q 39.2 | Page 116

What is the function of insulin hormone? What type of patients are given insulin injections?

Q 40 | Page 116

Compare the nervous system and endocrine system (hormonal system) for control and coordination in humans.

Q 41 | Page 116

State the functions of  Thyroxine hormones.

Q 42.1 | Page 116

State the functions of Adrenaline hormones. 

Q 42.2 | Page 116

State the functions of Growth hormone.

Q 42.3 | Page 116

Write the names of all the major endocrine glands present in the human body. Which of these glands also function as exocrine glands?

Q 43 | Page 116

Match the hormones given in column I with their functions given in column II :

Hormones Functions
(i) Thyroxine (a) Causes breasts to develop in females
(ii) Adrenaline (b) Causes the male to start producing sperms
(iii) Insulin (c) Prepares the body for an emergency
(iv) Estrogen (d) Controls the metabolic rate
(v) Testosterone (e) Regulates the amount of sugar in blood

 

Q 44 | Page 116

A person walks across a room in barefeet and puts his foot on a drawing pin lying on the floor. He lets out a cry. Explain what happens in his nervous system in bringing about this response.

Q 45 | Page 116

In what ways are puberty and adolescence result of the activity of some glands in the human body?

Q 46 | Page 116

List three ways in which neurons are similar to other cells.

Q 47 | Page 116

Explain the difference between of the following pair of terms :
receptor and effector

Q 48.1 | Page 116

Explain the difference between of the following pair of terms :

cerebrum and cerebellum

Q 48.2 | Page 116

What is the difference between a voluntary and an involuntary action? Which kind of action is digestion? Explain your choice.

Q 49 | Page 116

What does CNS stand for? Which part of CNS : (a) consists of two cerebral hemispheres, and (b) has spinal nerves attached to it?

Q 50 | Page 116

Which hormone prepares the body for action?

Q 51.1 | Page 116

Which hormone controls the amount of glucose in blood?

Q 51.2 | Page 116

Which hormone gives boys a deep voice?

Q 51.3 | Page 116

Which hormone gives girls soft skin?

Q 51.4 | Page 116

When you smell a favourite food your mouth begins to water (that is, you secrete saliva). Write down what is the example of the smell of the food?

Q 52.1 | Page 117

When you smell a favourite food your mouth begins to water (that is, you secrete saliva). Write down what is the example of the cells in your nasal passages which perceive the smell?

Q 52.2 | Page 117

When you smell a favourite food your mouth begins to water (that is, you secrete saliva). Write down what is the example of the gland which is stimulated to secrete saliva.

Q 52.3 | Page 117

Name the structural and functional unit of the nervous system.

Q 53.1 | Page 117

Draw a flow chart to show the classification of the nervous system into various parts.

Q 53.2 | Page 117

What is autonomic nervous system? What is its function?

Q 53.3 | Page 117

 What is voluntary nervous system? Explain the working of the voluntary nervous system with an example.

Q 53.4 | Page 117

What is a reflex action? Explain with the help of an example.

Q 54.1 | Page 117

Define reflex arc. Give the flow chart of a spinal reflex arc.

Q 54.2 | Page 117

How are involuntary actions and reflex actions different from each other?

Q 54.3 | Page 117

What is the function of our nervous system?

Q 55.1 | Page 117

What are the main organs of the human nervous system? Draw a labelled diagram to show the main organs of the human nervous system.

Q 55.2 | Page 117

How does the human nervous system work? Explain.

Q 55.3 | Page 117

Draw a labelled diagram of a neuron.

Q 56.1 | Page 117

What is a neuron?

Q 56.1 | Page 117

 What happens at the synapse between two neurons?

Q 56.2 | Page 117

What is a synapse?

Q 56.2 | Page 117

 How are the messages carried across a synapse? Explain with the help of a labelled diagram.

Q 56.2 | Page 117

Name two systems which taken together perform the functions of control and coordination in human beings.

Q 57.1 | Page 117

What does the central nervous system in humans consist of? What is the job of the central nervous system?

Q 57.2 | Page 117

Give the various functions of brain.

Q 57.3 | Page 17

 Write the names of five endocrine glands found in the human body. Name the hormones secreted by each gland.

Q 58.1 | Page 117

How do hormones reach the organs they control?

Q 58.2 | Page 117

Name the gland which controls the secretion of hormones from the pituitary.

Q 58.3 | Page 117

How does our body respond when adrenaline is secreted into the blood?

Q 58.4 | Page 117

Name the disease which occurs in adults due to the deficiency of iodine in the diet. What is the main symptom of this disease?

Q 58.5 | Page 117

A cell (or group of cells) in a sense organ which is sensitive to a particular type of stimulus is called :

(a) interceptor
(b) effector
(c) receptor
(d) acceptor

Q 59 | Page 117

Which of the following cannot be considered a receptor?

(a) ear
(b) nose
(c) muscle
(d) eye

Q 60 | Page 117

One of the following acts as an endocrine gland as well as an exocrine gland. This one is :

(a) salivary gland
(b) pancreas
(c) pituitary
(d) parathyroid

Q 61 | Page 117

Which of the following  helps in maintaining posture and balance of the human body?
(a) cerebellum
(b) cerebrum
(c) medulla
(d) pons

Q 62 | Page 117

The number of pairs of nerves which arises from the spinal cord is :
(a) 21
(b) 31
(c) 41
(d) 51

Q 63 | Page 117

Cerbellum, medulla and pons are the parts of :
(a) mid-brain
(b) hind-brain
(c) forebrain
(d) spinal cord

Q 64 | Page 117

Which of the following are cerebral reflexes?
(i) a person pulls away his hand on touching a hot object
(ii) a person spits out immediately when a fly enters his mouth while talking
(iii) A person walking bare foot lifts his foot at once on stepping on to a nail
(iv) A person's pupil contracts at once in the presence of bright light
(a) (i) and (ii)  (b) (ii) and (iii)  (c) (iii) and (iv)  (d) (ii) and (iv)

Q 65 | Page 117

odine is necessary for the synthesis of which of the following hormone?
(a) adrenaline
(b) auxin
(c) thyroxine
(d) insulin

Q 66 | Page 118

Which of the following is a mis-matched pair?

(a) adrenaline : pituitary gland
(b) estrogen : ovary
(c) pancreas : insulin
(d) progesterone : ovary

Q 67 | Page 118

One of the following is an incorrect statement about insulin. This is :

(a) it is produced in pancreas
(b) it regulates growth and development of the body
(c) it regulates blood glucose level in the blood
(d) its deficiency in the body will cause diabetes

Q 68 | Page 118

The spinal cord orginates from :
(a) cerebrum
(b) cerebellum
(c) medulla
(d) pons

Q 69 | Page 118

The involuntary actions in the body are controlled by :

(a) medulla in forebrain
(b)medulla in hindbrain
(c) medulla in spinal cord
(d) medulla in midbrain

Q 70 | Page 118

Which of the following is not an involuntary action?
(a) vomiting
(b) chewing
(c) heart beat
(d) salivation

Q 71 | Page 118

Which of the following hormone prepares our body for action in emergency situations?

(a) testosterone
(b) growth hormone
(c) adrenaline
(d) insulin

Q 72 | Page 118

One of the following controls the peristaltic movements of alimentary canal. This one is :

(a) cerebrum
(b) cerebellum
(c) pons
(d) medulla

Q 73 | Page 118

The hormone which is associated with male puberty is called :
(a) oestrogen
(b) adrenaline
(c) testosterone
(d) progesterone

Q 74 | Page 118

Which of the following endocrine gland does not occur as a pair in the human body?
(a) adrenal
(b) pituitary
(c) testis
(d) ovary

Q 75 | Page 118

The junction between two adjacent neurons is called :
(a) nerve junction
(b) sensory junction
(c) synapse
(d) neuro-muscular joint

Q 76 | Page 118

The life processes in humans are controlled and regulated by :
(a) reproductive and endocrine systems
(b) respiratory and nervous systems
(c) endocrine and digestive systems
(d) nervous and endocrine systems

Q 77 | Page 118

A doctor advised a person to take injection of insulin because :
(a) his blood pressure was high
(b) his heart beat was high
(c) his blood sugar was high
(d) his thyroxine level in blood was high

Q 78 | Page 118

All the voluntary actions of our body are controlled by :
(a) cerebrum
(b) cerebellum
(c) pons
(d) medulla

Q 79 | Page 118

One of the following statements is not true about thyroxine. This is :
(a) Thyroid gland requires iron to synthesise thyroxine
(b) It regulates carbohydrate, protein and fat metabolism
(c) Iodine is essential for the synthesis of thyroxine
(d) Thyroid gland can enlarge due to lack of thyroxine

Q 80 | Page 118

Which of the following does not act as an endocrine gland as well as an exocrine gland?
(a) testis
(b) ovary
(c) pituitary
(d) pancreas

Q 81 | Page 118

The part of brain which controls the involuntary action such as heart beat, breathing, blood pressure, etc. is :
(a) pons
(b) medulla
(c) cerebrum
(d) cerebellum

Q 82 | Page 118

Dwarfism results due to :
(a) excessive secretion of thyroxine hormone
(b) excessive secretion of growth hormone
(c) less secretion of adrenaline hormone
(d) less secretion of growth hormone

Q 83 | Page 119

The dramatic changes in body features associated with puberty are mainly because of the secretions of :
(a) estrogen from testes and testosterone from ovary
(b) estrogen from adrenal gland and testosterone from pituitary gland
(c) testosterone from testes and estrogen from ovary
(d) testosterone from thyroid gland and estrogen from pituitary gland

Q 84 | Page 119

Which of the following statements is correct about receptors?
(a) gustatory receptors detect taste while olfactory receptors detect smell
(b) both gustatory and olfactory receptors detect smell
(c) auditory receptors detect smell and olfactory receptors detect taste
(d) olfactory receptors detect taste and gustatory receptors detect smell

Q 85 | Page 119

The part of brain which takes part in regulating respiration in the human body is :
(a) medulla
(b) pons
(c) cerebellum
(d) cerebrum

Q 86 | Page 119

Electrical impulse travels in a neuron from :
(a) dendrite → axon → axon end → cell body
(b) cell body → dendrite → axon → axon end
(c) dendrite → cell body → axon → axon end
(d) axon end → axon → cell body → dendrite

Q 87 | Page 119

In a synapse, chemical signal is transmitted from :
(a) axon to cell body of the same neuron
(b) cell body to axon end of the same neuron
(c) dendrite end of one neuron to axon end of adjacent neuron
(d) axon end of one neuron to dendrite end of adjacent neuron

Q 88 | Page 119

In a neuron, the conversion of electrical signal to a chemical signal occurs at/in :
(a) dendrite end
(b) cell body
(c) axon end
(d) myelin sheath

Q 89 | Page 119

One of the following gives the correct sequence of the components in a reflex arc. This is :
(a) Receptors → Muscle → Sensory neuron → Motor neuron → Spinal cord
(b) Receptors → Motor neuron → Spinal cord → Sensory neuron → Muscle
(c) Receptors → Spinal cord → Sensory neuron → Motor neuron → Muscle
(d) Receptors → Sensory neuron → Spinal cord → Motor neuron → Muscle

Q 90 | Page 119

Which of the following statements are true?
(i) sudden action in response to something in the environment is called reflex action
(ii) sensory neurons carry electrical signals from spinal cord to muscles in a reflex action
(iii) motor neurons carry signals from receptors to spinal cord in a reflex action
(iv) the pathway of transmitting signals from a receptor to a muscle is a reflex action
(a) (i) and (ii)
(b) (i) and (iii)
(c) (i) and (iv)
(d) (i), (ii) and (iii)

Q 91 | Page 119

The gustatory receptors of our body are in one of the following organs. This organ is :

a) ear
(b) nose
(c) tongue
(d) skin

Q 92 | Page 119

The olfactory receptors in humans are located in :
(a) eyes
(b) tongue
(c) ears
(d) nose

Q 93 | Page 119

The contraction of pupil of the eye in the presence of bright light is an example of :
(a) Voluntary reflex
(b) Spinal reflex
(c) Cerebral reflex
(d) Adrenal reflex

Q 94 | Page 119

The faulty functioning of an endocrine gland can make a person very short or very tall. This gland is :
(a) thyroid
(b) pineal
(c) adrenal
(d) pituitary

Q 95 | Page 119

The underactive endocrine gland which causes goitre is :
(a) pancreas
(b) thyroid
(c) adrenal
(d) pituitary

Q 96 | Page 120

The endocrine gland whose malfunctioning causes diabetes disease is :
(a) pituitary
(b) pineal
(c) parathyroid
(d) pancreas

Q 97 | Page 120

The use of iodised salt is recommended to prevent :
(a) diabetes
(b) gonorrhoea
(c) dysentery
(d) goitre

Q 98 | Page 120

Which of the following are often called glands of emergency?
(a) thyroid
(b) pituitary
(c) adrenal
(d) pancreas

Q 99 | Page 120

P is a cell (or group of cells) in the human body which is sensitive to a particular type of stimulus and conveys the messages to CNS through nerves Q. On the other hand, R is a part of the human body which can respond to a stimulus according to the instructions sent from the CNS through nerves S.
(a) What is P? Name five organs which contain cells (or group of cells) like P.
(b) Name the nerves Q.
(c) What is R? Give two examples of R.
(d) Name nerves S.
(e) How do messages travel through the nerves Q and S?

Q 100 | Page 120

The human body contains a large number of cells A which are very long and branched, and look like electric wires. The longest branch of this cell is B whereas there are many small branches C. Any two A cells do not join to one another completely in the human body. There is a microscopic gap D between every pair of adjacent A cells through which electric impulses can pass by the release of a chemical substance.
(a) What are cells A?
(b) What is the name of (i) branch B, and (ii) branches C?
(c) What is the microscopic gap D known as?
(d) What is the function of cells like A in the human body?
(e) The cells A are of three types. name the three types.

Q 101 | Page 120

When we touch a hot plate unknowingly, then this heat is sensed by a receptor P present in our fingers. The receptor triggers and impulse in neuron Q which transmits the message to an organ R which is a part of the central nervous system. Here the impulse is passed on to a neuron S which in turn passes it to a yet another neuron T. The neuron T passes the impulse to a tissue U in our arm. The tissue U then contracts and pulls our hand away from the hot plate.
(a) What is the name of (i) receptor P (ii) neuron Q, and (iii) organ R?
(b) What is (i) neuron S, and (ii) neuron T?
(c) Name the tissue U.
(d) What name is given to the phenomenon in which hand is pulled away quickly from the hot plate?
(e) Name the effector in this whole process.

Q 102 | Page 120

The gland X which is located just below the brain in the human head secretes a chemical substance Y which controls the development of ones and muscles in the body of a person. Secretion of too little of substance Y as well as the secretion of too much of substance Y by the gland X leads to abnormal development of the body of a person.
(a) Name the gland X.
(b) What is the chemical substance Y?
(c) What happens if too little of substance Y is secreted?
(d) What happens if too much of substance Y is secreted?
(e) Name the system of glands in the human body of which gland X is a part.

Q 103 | Page 120

A and B are the two systems of control and coordination in the human body. The messages in system A are transmitted in the form of chemical substances C which travel comparatively slowly through the blood stream. The substances C are made in tissues D present in the head and trunk of human body. The messages in system b are transmitted very quickly in the form of electrical impulses through fibres E. The effect of messages transmitted by system b usually lasts for a much shorter time as compared to those transmitted by system A.
(a) Name the system A. What does system A consist of?
(b) Name the chemical substance C.
(c) What is tissue D? Name any five such tissues in the human body.
(d) Name the system B. What does system B consist of?
(e) Name the fibres E.
(f) State whether system A controls the working of system B or system B controls the working of system A.

Q 104 | Page 120

A cylindrical structure P in our body begins in continuation with medulla and extends downwards. It is enclosed in a bony cage Q and surrounded by membranes R. As many as x pairs of nerves arise from the structure P. The structure P is involved in the reflex actions of our body and conduction of nerve impulses to and from another organ S of our body with which it forms CNS.
(a) Name the structure P.
(b) Name (i) bony cage Q, and (ii) membranes R.
(c) How much is x?
(d) Name the organs S.
(e) What are the reflexes involving structure P only known as?

Q 105 | Page 121

The pancreas is made up of two parts A and B. The part A secretes insulin whereas part B secretes pancreatic juice.
(a) Which part is functioning as an endocrine gland? Why?
(b) What is insulin and what effect does it have in the body?
(c) Name the disease which can be treated by giving insulin injection.
(d) What does pancreatic juice contain? Where does pancreatic juice go?
(e) Name the life process in which pancreatic juice is made use of.

Q 106 | Page 121

The gland A is attached to the wind pipe in the human body. The gland A makes and secretes a hormone B which controls the metabolism of carbohydrates, fats and proteins in the body. The non-metal element C is necessary for the formation of hormone B. The deficiency of C in the diet can cause a deficiency of hormone B in the body leading to a disease D in which the neck of a person appears to be swollen. People are advised to use salt E in cooking food so as to avoid disease D.
(a) Name (i) gland A, and (ii) hormone B.
(b) What is the element C?
(c) Name one type of food which can provide sufficient C in the diet of a person.
(d) Name (i) disease D, and (ii) salt E.

Q 107 | Page 121

   A piece of thread was tied tightly around an animal's pancreatic duct. The animal subsequently had difficulty in digesting food but did not get diabetes. Explain.

Q 108 | Page 121

Which is the target organ of both adrenaline and insulin?
(a) heart
(b) kidney
(c) liver
(d) pancreas

Q 109 | Page 121

A gland W is located just below the stomach in the human body. The gland W secretes a hormone X. The deficiency of hormone X in the body causes a disease Y in which the blood sugar level of a person rises too much. The person having high blood sugar is called Z.
(a) Name (i) gland W, and (ii) hormone X.
(b) What is the function of hormone X?
(c) Name (i) disease Y, and (ii) person Z.
(d) What advice would you like to give to a person who is suffering from disease Y due to faulty life-style?

Q 110 | Page 121

There are two similar glands P which are located on top of two similar organs Q in the human body. P are often called the emergency glands and they secrete a hormone R into the blood stream. R is secreted in large amounts when a person is frightened. It brings about temporary changes in the body which allow a lot of substance S from the liver to go into the blood to provide a lot of energy in a very short time. This helps a person to fight back or run away from the frightening situation.

What are P, Q, R and S?

Q 111 | Page 121

A and B are two pairs of glands that are present in the human endocrine system. The pair A is found only in females, whereas B is present only in males. Glands A make and secrete two hormones C and D, whereas glands B make and secrete only one hormone E. In addition to hormones, Glands A make gametes F, whereas glands make gametes G.
(a) What are the glands A?
(b) What are the hormones C and D?
(c) What are the glands B? Name the hormone E.
(d) What are the gametes F and G?
(e) Which event in the life of males and females is associated with the secretion of the hormones C, D and E?

Q 112 | Page 121

The organ A which is located inside the skull of our body is protected by a bony shell B. It is surrounded by three layers membranes C. The spaces between these layers are filled with a liquid D which protects organ A from mechanical shocks. Organ A in combination with another organ E makes up the central nervous system.

(a) What is organ A?
(b) What are B, C and D?
(c) Name the organ E.
(d) While walking barefoot, if we happen to step on a sharp piece of stone, we immediately lift our foot up. Which of the two organs: A or E, is directly involved in this action?
(e) If we step out from a darkened room into bright sunlight, we close our eyes for a moment. Which of the two organs: A or E, is directly involved in this action?

Q 113 | Page 122

Write down the following activities in the correct order for a simple reflex arc:
(a) impulse travels in the motor fibre
(b) impulse travels in the sensory fibre
(c) effector organ stimulated
(d) impulse crosses the synapse

Q 114 | Page 122

Explain why the tongue may be considered as both a receptor and an effector organ.

Q 115 | Page 122

Lakhmir Singh Biology Class 10 (2019 Exam)

Biology for Class 10 (2019 Exam)
S