On a bright sunny day, the leaves of certain plants roll up. Give suitable explanation.

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Solution

Many monocot plants that survive in dry climate or drought conditions have large, transparent bubble like cells flanking their mid-vein. During water deficit conditions these cells become flaccid and make the leaf margin roll towards the vein, thus, reducing transpiration. With the return of normal water conditions the cells become turgid, opening the leaf blade to facilitate transpiration.

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Similar questions

Give suitable explanation for the following :

(a) A higher rate of transpiration is recorded on a windy day rather than on a calm day.

(b) Excessive transpiration results in the wilting of the leaves.

(d) More transpiration occurs from the lower surface of a dorsiventral leaf.

(e) Cork and bark of trees help in preventing loss of water.

(f) Perspiration and transpiration help to cool the body temperature of the organism.

(g) On a bright sunny day, the leaves of certain plants roll up.

Q. A higher rate of transpiration is recorded on a windy day rather than on a calm day. Give suitable explanation

Q. 0bserve the picture of an activity carried out with leaves of plants and bell jar.

Now answer the following.
(a) Which process is demonstrated in the activity?
(b) When will this activity show better results on a bright sunny day or a cloudy day?
(c) What will you observe in the bell jar after a few hours of setting up the activity?
(d) Mention any one precaution you must take while performing this activity.

Question 16

Observe the figure of an activity given, carried out with leaves of plants and polythene bag. Now answer the following.

(a) Which process is demonstrated in the activity?
(b) When will this activity show better results on a bright sunny day or a cloudy day?

(c) What will you observe in the polythene bag after few hours of setting up the activity?
(d) Mention any one precaution you must take while performing this activity?

Q. Excessive transpiration results in the wilting of the leaves. Give suitable explanation.

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