Question

give reason why cactus has needle shaped leaves?
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Answer 1

Answer:

By shading the cactus, these spines also help prevent the cactus from losing water through evaporation. So all in all, spines are adaptations that protect and help cacti hide from animals that may want to eat them. They also provide shade for the plant, which keeps them cooler and limits water loss.

Answer 2

Answer:

So, one reason for why cacti have needles is to prevent thirsty or hungry animals from eating or damaging the plant. ... These spine clusters almost act like mini-umbrellas that help to shade the plant. By shading the cactus, these spines also help prevent the cactus from losing water through evaporation