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26 Oct 2010 16:55:13 IST

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In opuntia leaves are modified into spines because of lack of water in deserts. But opuntia presen

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In opuntia leaves are modified into spines because of lack of water in deserts. But opuntia present in water available places Why the spines are not modified into leaves.

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Vikram Saxena

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Joined: 1 Apr 2007

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6 May 2012 19:23:15 IST

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The leaf-nature of spines is certainly understandable from the point of view of ... So the evolutionary conversion of cactus leaves into spines did not involve a mere ...(modified spines), and the basal portion produces flowers (not shown here)

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