Question

why the leaves in cactus plants are reduced to spines?​

Answer 1

Answer:

because

Explanation:

leaves lose water by the process of transpiration but cactus grows in deserts and cannot afford to lose water .The spines of cactus store water .They reduce air flow around cactus and help the plant to get enough water by storing it.

Answer 2

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