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The cactus has needles to lessen the loss of moisture through evaporation. Needles are the cactus plant's equivalent of leaves. The smaller the leaf or needle surface, the less the loss of...
Cactus needles have a number of functions. Firstly, because cactus plants live in deserts and semi-arid areas, the needles reduce the loss of moisture that normally occurs through evaporation. As the...
its because the needles are actually leaves. they are small because if they were bigger, then they would waste water. also, the "leaves" have small waxy cuticles(i think that's how to spell them)...
the spines or spikes on a cacti are actually leaves. in order to conserve water, prevent evaporation, and serve as a form of defense the leaves have turn into spikes. instead of in the leaves cacti...
To protect it for animals. They contain allot of water so their good food if your in the desert. They are leaves and so small because if they weren't they would wast water. they contain...