When the rate of transpiration exceeds the rate of water absorption, the leaves wilt and droop while the stem remains upright.
Explain why the stem remains upright when the leaves wilt.

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When the soil of a plant runs too low on available water, the water chains in the xylem become thinner and thinner due to less water. When this happens, the plant loses its turgidity and begins to wilt. Low soil moisture is often the reason this happens but other factors play a role as well.

Explanation:

hope this helps

desert perennials often survive by remaining dormant during dry periods of the year, then springing to life when water becomes available. most annual desert plants germinate only after heavy seasonal rain, then complete their reproductive cycle very quickly.