A) hormonal change
B) change in temperature
C) change in turgor pressure
D) presence of bulliform apparatus
Correct Answer: D
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.
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