1. Why are the leaves in a cactus plant modified to spines ? How then, does the plant make food ?
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Leaves in a cactus are modified into spines to reduce loss of water from leaves by transpiration . Then the plants make from the process of photosynthesis which is performed by the stem .
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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.
Since cacti don't have true leaves, their stomata are in the body of the plant, or the stem. ... Plants can use this carbon dioxide plus sunlight and water to make their food. It's a process called photosynthesis and it helps plants get the energy they need to survive.
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