How Do We Detect the Smell of an Agarbatti (Incense Stick)? - Science


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



When the smell of the incense stick reaches to our nose then the olfactory receptors present in our nose detects it send this information in fore brain in the form of electrical signals. Fore brain interprets this information as the smell of incense stick where it is already stored.

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Chapter 2: Control and Coordination - Exercise 2 [Page 116]


Lakhmir Singh Class 10 Biology (Science)
Chapter 2 Control and Coordination
Exercise 2 | Q 34.3 | Page 116
NCERT Science Class 10
Chapter 7 Control and Coordination
Intext Questions | Q 4 | Page 119


With the help of a neat and labelled diagram, describe reflex arc.

Give examples of unconditional reflexes

Name one gustatory receptor and one olfactory receptor present in human beings.

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

State one function each of cerebellum and pons.

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

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

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?

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

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

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)

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

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

Put a tick mark (✓) against the correct alternative in the following statement:

The smell of good food causes watering of your mouth. It is a

Your are driving your bicycle at a fast speed. Suddenly, a small boy comes in front of your cycle and, without wasting any time in thinking, you immediately apply the brakes and accident is avoided. What name is given to such an action?

Differentiate between the following pair of terms:
Stimulus and impulse

With the help of suitable example, describe reflex action.

Differentiate between natural reflex and conditioned reflex. Give examples to illustrate your answer.

Multiple choice question. Tick (✓) the correct choice:

Reflex actions occur under the control of

  1. brain
  2. medulla oblongata
  3. spinal cord
  4. cerebrum

Define voluntary and reflex actions. Give examples of each.

Note the relationship between the first two words and suggest the suitable word/words for the fourth place.

Stimulus: Receptor:: Impulse: …………….

Explain the mechanism of reflex action with the help of a suitable diagram.

State whether the following is

Constriction of pupil

State whether the following is

Knitting without looking

State whether the following is


State whether the following is

Playing on the Keyboard

State whether the following is

Salivation when food is put in the mouth.

What type of reflex is the following?

Knitting and swimming

Give Reason:

 The hand automatically shows the direction to turn a cycle without thinking.

Mention, if the following statement is True or False
Reflex action is a unit of nervous action

Complete the following sentence with appropriate Word
Which of the following is not a natural reflex action?

In reflex action, the reflex arc is formed by ______

A change in the environment that causes an animal to react is called ______.

Give an example for conditioned reflexes.

Differentiate between Voluntary and involuntary actions.

What will you do if someone pricks your hand with a needle? Elucidate the pathway of response with a neat labelled diagram.

Reflex arc allows the rapid response of the body to a stimulus.

Which of the following is an example of unconditioned reflex?

The reflex arc which is made up of one sensory and one motor neuron is ______ 

Which of the following is not involved in Knee-jerk reflex?

The given diagrammatic representation of reflex action shows knee jerk reflex.

Identify the parts labeled as A to E and select the correct option.

If after cutting through dorsal root of a spinal nerve of a mammal, the associated receptor in skin was stimulated the animal would ______.

Which sensory organ is involved in vertigo (sensation of oneself or objects spinning around)?

What kind of reflex is cycling?


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