Give biological explanations of the following :
On a bright sunny day, the leaves of certain plants roll up.

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Solution

Turgidity:
Opening and rolling up of leaf blades depends on turgidity and flaccidity respectively of cells of the leaf.
Many monocot plants that survive in dry climates or drought conditions have large, transparent bubble-like cells flanking their mid-veins.
During water-deficient conditions or on a bright sunny day, 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 reason for the following:

The leaves of certain plants roll up on a bright sunny day.

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 scientific reasons for the following statement.

The leaves of certain plants roll up on a bright sunny day.

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Give biological explanations of the following :On a bright sunny day, the leaves of certain plants roll up.

Give biological explanations of the following :
On a bright sunny day, the leaves of certain plants roll up.