Q16 of 86 Page 152

Name the cell that surrounds the stoma.

Guard cells surround the stoma. They are bean or kidney shaped. They have thick inner walls but thin outer walls. When they become turgid the stomata opens during day time. But at night time the guard cells turn flaccid closing the stomata.


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14

Give an example for the movement plant part which is very quick and can be observed easily.

 15

To which directional stimuli do (a) roots respond (b) shoots respond?

 1

Assertion (A): If the plant part moves in the direction of gravity, it is called positive geotropism.

Reason (R) : Stem shows positive geotropism

 2

Assertion (A): The loss of excess water from the aerial parts of the plant in the form of water vapour is known as transpiration.

Reason (R) : Stomata of the leaf perform transpiration.