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The only leaves which do not stay green are generally the deciduous ones. They shed their leaves during the autumn to prepare themselves from the cold and harsh winter. A cactus has a green fleshy stem which actually contains chlorophyll. The leaves are actually the thorns!! There is no reason for a cactus to change color. It cannot store much also due to its small size. Hence it must continuously photosynthesize to produce food.

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11y ago
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Q: Why a cactus stay green all year?
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