Question

Why are the leaves of cactus plant reduced to spine ?
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Answer 1

Answer:

The leaves are reduced to pines to avoid transpiration and loss of water

Explanation:

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Answer 2

Here is the answer to your question:

Cactus have leaves instead of spines . Since cactus are desert plants , the transpiration is highest and in order to reduce transpiration(loss of water) and to defend themselves by getting eaten up by animals the leaves are modified into spines.