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Stomata

In monocots, ...

Question

In monocots, the guard cells are

A

Dumb-bell-shaped

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B

Reniform

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C

Spherical

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D

Isodiametric

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Solution

The correct option is A Dumb-bell-shaped

The modified epidermal cells present in the stomata are called guard cells. These are kidney shaped in dicots and dumb-bell shaped in monocots.
So, the correct option is ‘Dumb-bell shaped’.

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Q. Select the correct events leading to the stomatal opening.
(a) The decline in guard cell solutes.
(b) Lowering of osmotic potential of guard cells.
(c) Rise in K ions in guard cells.
(d) Movement of water from neighboring cells into guard cells.
(e) Guard cells become flaccid.

Q. Arrange the events of the opening of stomata in the correct sequence and choose the correct option accordingly.

I. Lowering of osmotic potential of guard cells.
II. Decline in guard cell solute.
III. Rise of potassium ion level in guard cells.
IV. Guard cells absorb water from neighboring epidermal cells.
V. Guard cells become flaccid.

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