More transpiration occurs from the under surface of the dicot leaves

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Solution

Dicot plants or dicotyledons have a pair of cotyledons.
The dicots have dorsiventral (the two surfaces of the leaf i.e., dorsal and ventral differ from each other in appearance and structure) leaves.
Stomata count on the lower surface of dorsiventral leaves is more.
Transpiration rate increases with the rise in the number of stomata.
Dicots have more stomata on the lower surface of the leaves and therefore increased transpiration is observed.

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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.

Which of the following statements are true and which ones are false? Give reason in support of your answer.

(a) Potometer is an instrument used for demonstration of transpiration occurring from the lower surface of a leaf.

(b) Hydathodes are similar to stomata in plant physiology.

(d) Some desert plants have sunken stomata on their leaves.

(e) Most transpiration occurs during midday.

State whether the following statements are true or false.

More transpiration occurs from the under surface of a dicot leaf.

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