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  4. Leaves of grasses roll and unroll due to :

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Q. Leaves of grasses roll and unroll due to :

Jharkhand CECEJharkhand CECE 2006

Solution:

Isobilateral leaf is found in monocots and both the surfaces of leaf are covered by epidermis. The upper epidermis possesses groups of larger sized, thin walled vacuolate cells called bulliform or motor cells. They help in rolling of leaves during drought.