Question

Why the stem has to performs photosynthesis in xerophytes?​

Answer 1

Unlike other plants the stem of Xerophytes performs photosynthesis because the temperature condition of region where they grow is extremely high (desert region).

Answer 2

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Unlike other plants the stem of Xerophytes performs photosynthesis because the temperature condition of region where they grow is extremely high (desert region). Xerophyte do have leaves but their leaves are modified into spines  and the function of photosynthesis is carried by stems only because in leaves a great amount of transpiration would occur making the plant unable to produce food and causing it to dry out.

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