As deserts are extremely cold at night, how do plants like cactus survive the cold night in the desert?

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As deserts are extremely cold at night, how do plants like cactus survive the cold night in the desert?

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Cacti are CAM Plants. CAM plants open their stomata (its own ‘sweat pores’) at night and not during the day. Stomata let them respire. At night the heat drops, which drops its rate of water loss.

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