Question

why are leaves of cactus plants in the form of spines ​

Answer 1

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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.

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Answer 2

Answer:

The leaves of cactus plants in the form of spines because it helps to reduce evaporation and transpiration.