Leaves of plants wilt on a bright sunny day.

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Solution

Wilting:
The loss of turgidity of the areal parts of the plant that makes it droop is called wilting.
It occurs due to less water in the cells.
On a bright sunny day the transpiration increases which thereby enhances the water loss in plants.
The rolling of leaves reduces the surface area for water evaporation.
Wilting is observed on a sunny day to reduce the water loss in plants.

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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.

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

Give reason why on a bright sunny day the leaves of certain plant rolls up?

Q. A well-watered potted herbaceous plant shows wilting in the afternoon of a dry sunny day. Why?

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