[ Cool Design ] Cactus not a hugger t-shirt

The cactus does not have leaves to make food; it uses its stem instead. This adaptation greatly reduces water loss. The stem of the cactus also has a thick waxy surface which stops water passing through it. Most cacti do not have branches. This reduces the area of the stem through which water can pass. In fact many cacti make the surface area of their stems as small as possible by having it in the shape of a dome, and growing close to the ground.
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One cactus that grows in the Mexican desert even sinks below ground in the dry season and grows above ground again after rain. The stem of a cactus has spaces for storing water, and a skin which can change shape as the amount of water changes, rather like a concertina. When the cactus has little water stored, the surface of the stem has deep grooves in it. But as more water is stored, the stem swells up and the grooves become much less deep.