Grass leaves curl inwards during very dry weather. Select the most appropriate reason for the following:

  • Option 1)

    Closure of stomata

  • Option 2)

    Flaccidity of bulliform cells

  • Option 3)

    Shrinkage of aire spaces in spongy mesophyll

  • Option 4)

    Tyloses in vessels

Answers (10)

 

Opening and closing of stomata -

This is governed by the change in osmotic pressure or turgidity of guard cells.

- wherein

When guard cells are turgid, stomata open and when guard cells are flaccid, stomata close.

 

 

 

The rolling or curling of grass leaves is mainly done due to bulliform cells. These are large bubble - shaped cells distributed between epidermal cells of the leaf. During stress conditions (such as dry weather) they become flaccid and causes the leaves to curl or roll. They unroll the leaves by gaining turgidity once stress conditions are over.

 


Option 1)

Closure of stomata

Option 2)

Flaccidity of bulliform cells

Option 3)

Shrinkage of aire spaces in spongy mesophyll

Option 4)

Tyloses in vessels

Option 2 os correct

Option  2

Option 3

2 nd ans

 

2) Flaccidity of Bulliform cells

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