First slide

Anatomy of Dicotyledonous and Monocotyledonous Plants

Question

Leaves of grasses roll and unroll due to

Moderate

A

Hormonal change.
B

Presence of Bulliform cells.
C

Change in turgor pressure of guard cells
D

Change in temperature.

Solution

Leaves of grasses show rolling and unrolling due to the presence of bulliform cells. In dry conditions, the bulliform cells of adaxial side lose turgor, become flaccid and the lamina of leaf rolls towards the mid rib from margins to hide some of the stomata to minimise transpiration. In humid conditions, they regain turgor pressure and the lamina is spread out.

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