leaves of some plant are modified to spines give reason
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Most species of cacti have lost true leaves, having only spines, which are highly modified leaves, as well as defending against the herbivores. Spines help prevent water loss by reducing air flow close to the cactus. In the absence of leaves, enlarged stems carry out photosynthesis.
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when leaves are modified into leave spines because they help to reduce the loss of water through transpiration in xeric condition
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