Question

(1) The stems of cactus perform in the absence of leaves.
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Answer 1

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Most species of cacti have lost true leaves, having only spines, which are highly modified leaves, as well as defending against the herbivores. Spines help prevent water loss by reducing air flow close to the cactus. In the absence of leaves, enlarged stems carry out photosynthesis.

Answer 2

Hello,

Here is your answer::

Due to high heat in deserts cacti don't have leaves or are reduced to spines to prevent transpiration.

In this case the green and fleshy stem has chlorophyll and thus performs photosynthesis for the plant.

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