why cactus stem is covered with thick waxy coating
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The inside of the stem is either spongy or hollow (depending on the cactus). A thick, waxy coating keeps the water inside the cactus from evaporating. Many cacti have very long, fibrous roots, which absorb moisture from the soil.
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Because it grows in desert and there is no sufficient water and waxy coating does not need water that's why in cactus plant it is covered with waxy coating
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