At night when stomata close... Select one: a. phloem transport stops. b. transpiration stops and leaf...

At night when stomata close...

Select one:

a. phloem transport stops.

b. transpiration stops and leaf water potential increases.

c. respiration stops.

d. transpiration stops and leaf water potential decreases.

Expert Solution

b. transpiration stops and leaf water potential increases.

Stomata are pores in the leaf that allow gas exchange where water vapor leaves the plant and carbon dioxide enters. Special cells called guard cells control each pore's opening or closing. The two main functions of stomata are to allow for the uptake of carbon dioxide and to limit the loss of water due to evaporation. Stomata remain open during the day and closed at night. At night, when sunlight is no longer available and photosynthesis and transpiration are not occurring, stomata close. This closure prevents water from escaping through open pores.

At night inorder to close stomatal opening the guard cells actively pump potassium ions out of the guard cells and into surrounding cells. This causes water in the enlarged guard cells to move osmotically from an area of low solute concentration (guard cells) to an area of high solute concentration (surrounding cells). The loss of water in the guard cells causes them to shrink. This shrinkage closes the stomatal pore. This movement of water from guard cell to the neighbouring cells increase the water potential of the leaves.

gladiator answered 2 years ago

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