Even though they look different, how are a leaf cuticle and a thorn the same?
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Xerophytes are the plants growing in water scarcity. These plants show a number of adaptations to conserve water, like presence of thick cuticle layer, reduction in size of leaves to scales or spines, multilayered epidermis and sunken stomata in leaves. These plants also have well developed extensive root system, which helps in absorbing as much water as possible. Some xerophytes, like cactus open their stomata during night time and show crassulacean acid metabolism (CAM).
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Prickles are comparable to hairs but can be quite coarse (for example, rose prickles). They are extensions of the cortex and epidermis. Technically speaking, many plants commonly thought of as having thorns or spines actually have prickles.
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