Question

how do leaves of plants help in excretion​

Answer 1

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Many plants store waste materials in the vacuoles of mesophyll cells and epidermal cells. When old leaves fall, the waste materials are excreted along with the leaves.

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Answer 2

Leaves of plants help in excretion in many ways:

$\bullet$ Excess of water in plant is discarded by the process of transpiration. This process takes place through the leaves.

$\bullet$ Some waste materials get accumulated in older leaves. When old leaves fall, the waste materials are excreted along with the leaves.