Question

9.   Which of the following describes a phenomenon that occurs when we observe plants that wilt?

A. The xylem releases all its water.   B. The roots begin to rot, causing them to no longer uptake water.   C. The stomata close, cutting off transpiration and gas exchange.   D. The plant begins absorbing oxygen and releasing carbon dioxide into the atmosphere.

Answer 1

C

Plant wilts when soil water decreases to level so that plants cannot uptake water from soil. So, to survive plants close their stomata, cut down transpiration to prevent any water loss. Closure of stomata leads to stoppage of gaseous exchange as well.

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Answer 2

The xylem releases all its water.