Q.

Choose the incorrect statement.

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a

The guard cells possess chloroplasts.

b

In grasses, the guard cells are dumb-bell shaped.

c

The outer walls of guard cells (away from stomatal pore) are thick and the inner walls (towards stomatal pore) are thin.

d

Subsidiary cells are modified epidermal cells.

answer is B.

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Detailed Solution

The outer wall of the guard cell is thin, and the inner wall is thick. Because of this uneven thickness, it acquires a crescent shape. 

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