1. why stem of a cactus perform the function of a leaf ?

as the leaf of a cactus is filled up with spines it could not make food

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IN DESERT PLANTS,THE STEM IS MODIFIED INTO GREEN FLATTENED OR ROUNDED STEM WHICH BEARS MODIFIED LEAVES IN THE FORM OF SPINES TO REDUCE WATER LOSS. E.g- PRICKLY PEAR.

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