Why do cacti have needles?

Question by PrairieMom Reward: 25 Pond Points + 10 Knowledge Tokens Status: Pending a resolution
Why do cacti have needles?


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Comment from d_Oz User Rating:  120 Knowledge Tokens
To keep a water source for people, and keep the animals away
- see animal know where to feed, not all people do
- so the needles suit well in protecting the plant

That's what I think.
Is a cacti a plant - or is it just a cacti?

Comment from etmarborist User Rating:  0 Knowledge Tokens
Needles on a cactus are modified leaves.

Comment from Mahibio User Rating:  50 Knowledge Tokens
leaves are modified to thorns to conserve loss of water,in hot environmentalso to check grazing by animals


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