(B) The correct answer is $B$. In some leguminous plants,the leaf base becomes swollen,which is known as the pulvinus. This structure plays a crucial

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(B) The correct answer is $B$. In some leguminous plants,the leaf base becomes swollen,which is known as the pulvinus. This structure plays a crucial role in the movement of leaves,such as in the case of $Mimosa$ $pudica$ (touch-me-not plant) and other legumes like pea and gram.