Lakhmir Singh solutions for Biology [English] Class 10 ICSE chapter 7 - Chemical Coordination in Plants [Latest edition]

The chemicals that help in control, coordination and growth of plants are known as ______.

______ are responsible for phototropic response of the plants.

True or False.

Auxins regulate cell division and cell differentiation in plants.

True or False.

Auxins speed up the growth of the roots.

True or False.

Abscisic acid promotes plant growth.

Mark the odd one out:

The fruit ripening hormone is ______.

______ is response of plant to light.

Tendrils are positively ______ and they always grow towards the support.

True or False.

Auxins always accumulate on the illuminated portion of the stem and this result in rapid division of cells in the shaded side.

True or False.

Chemotropism is a directional response of plants to a chemical substance.

True or False.

Roots are negatively geotropic and positively hydrotropic.

Stem tendrils are present in:

Tropic movements help the plant to obtain ______.

Why insectivorous plants are called partial heterotrophs?

How does pitcher plant trap insects?

Which hormone is responsible for nastic movements?

How are the tropic movements of plants helpful to the farmers?

______ movements are independent of direction of stimulus.

The non-directional movement in response to light intensity is termed as ______.

______ regulate many functions in plants.

True or False.

Nastic movement is independent to stimuli shown by plants.

True or False.

Dandelion flowers are sensitive to light.

True or False.

The folding of leaves of Mimosa pudica on touching is a growth movement.

True or False.

Plant hormones are associated with the directional growth movements in plants.

True or False.

Thigmonastic movements are growth movements.

True or False.

Unequal rate of growth in shoots results in bending of shoots towards light.

True or False.

Hydrotropism is movement of the plant in response to gravity.

True or False.

The opening and closing of stomata are not regulated by plant hormones.

True or False.

Closing and opening of flower in response to light intensity is a growth movement.

In tropic movements the plant parts move in response to the direction of the ______.

A plant hormone that is found in higher concentration in ripe banana is ______.

The hormone responsible for apical dominance is ______.

The plant hormone that induces root hair growth is ______.

Non-directional movements in plant parts in response to external stimulus are ______ movements.

The growth of pollen tube towards the ovule is an example of ______ movement.

Match the Following.

Give One Word Answer.

The hormone that promotes the growth of a tendril around a support.

Give One Word Answer.

Hormone that promotes ripening of fruit.

Give One Word Answer.

Hormone used to break seed dormancy.

Name the following:

Growth-retarding hormone in plants.

Name the following:

Hormone that stimulates growth by cell division.

Directional movement of plants in response to external stimuli is called ______.

The reason behind the change in shape of plant cell in response to stimulus is ______.

The hormones which help in the growth of plant stem are ______.

Mark the odd one out:

Closing of Venus fly trap leaf when it captures prey is an example of ______.

Which of the following is not a growthdependent response?

Name one example of the movement of a plant part which is not a growth movement and can be observed easily. Name the plant where this is observed.

What is the stimulus in phototropism?

What is the stimulus in hydrotropism?

What is the stimulus in chemotropism?

How does auxins promote apical dominance?

What is meant by abscission?

Which plant hormone is responsible for abscission?

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

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

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

Name the plant part which bends towards the source of water.

Name two types of tendrils with an example of each.

How do the tendrils respond to the stimulus of touch of a support?

Expand the following biological abbreviations :
(i) ABA 

Expand the following biological abbreviations : 
IAA

Expand the following biological abbreviations : 
 ATP 

Identify the ODD term in the set and name the CATEGORY to which the remaining three belong:

Auxin, Ethylene, Adrenaline, Cytokinin

Differentiate between the Following:

Hydrotropism and Geotropism

Differentiate between:

Positive and negative tropism

Differentiate between the Following:

Chemotropism and Thigmotropism

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

Differentiate between the Following:

Auxin and Abscisic acid

How do tropic movements help the plants in their survival?

What would happen if plants could not respond using tropisms?

The tea bushes are pruned at regular intervals. Why? Which phenomenon is overcome by frequent pruning? Name the hormone responsible for this phenomenon.

How does control and coordination takes place in plants?

Explain response of plant parts to light with the help of a diagram.

What will happen to a ripe fruit placed in bag with raw fruits? Name the hormone responsible for it. What are other effects of this hormone on the plant?

What is the difference between thigmotropism and thigmonasty?

Study the given figure and answer the following:

1. What type of phenomenon is exhibited by the plant?
2. What will happen if after few days clay pot with water is shifted to the other side?

Study the given figure and answer the following:

1. What phenomenon is being shown in the above figure?
2. Name the hormone responsible for the above changes.
3. Mention another feature of this hormone.

Study the below given figure and answer the following.

1. Can you identify the tree?
2. What tropism does it show?
3. Why do you think it occurs?

1. Look at the figure. Make a table and ask at least 10 people if they know about these plant hormones.

2. Find out if these hormones are synthetically sold in the market and under what names (products).

3. Write the chemical formula for each hormone.

4. Take a printout of something similar to the figure given below. Add clippings and pictures to this. Fix this in your bulletin board in school.

ACROSS

1. Giving out of water vapour by the plants through stomatal openings
2. Removal of excess water through the leaf veins
3. After shrinkage of plasma membrane the cells become ______
4. Process by which plant cells lose water when placed in hypertonic solution
5. Minute pore in the epidermis of leaf that help in exchange of gases
6. Stacks of thylakoid in the chloroplast
7. Shedding of leaves, flowers and fruits due to imbalance of hormones
8. Promotes cell differentiation and enlargement of cell in plants
9. Natural purifiers of air
10. Relative concentration of a solution that determines the movement of water in a cell

DOWN

1. Phenomenon of swelling of a cell due to absorption of high fluid content
2. Promotes cell division in plants
3. Thread-like outgrowths from the plant parts that provide support to the plant in standing upright
4. Nastic movement where a plant part bend outward and often downward
5. Absorption of water by the cells due to surface attraction leading to the swelling of the cells
6. Process of movement of molecules from a region of higher to a region of lower concentration
7. Flattened disc-like structures in the chloroplast
8. Movement of water molecules from high to lower concentration through a semi-permeable membrane
9. Another name for ripening hormone
10. Secretion of xylem sap from a cut or injured plant part
11. Waxy layer secreted by epidermal cells on the surface of the leaf
12. Electrons convert ______ to ATP