Which factor regulates the loss of water through transpiration?

Nitrogen

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Humidity

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Level of

O_{2}

in air

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Xylem

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Solution

The correct option is D Humidity
Transpiration describes loss of water from aerial parts like leaves in gaseous vapour form through the stomata. The rate of transpiration depends on vapour pressure gradient between leaf mesophyll tissue and the atmosphere. Thus, transpiration rate is affected by atmospheric humidity. Higher the humidity level in atmosphere, lower will be the transpiration rate and vice versa.

Suggest Corrections

Hormone	Source	Function
A.Vasopressin	Posterior pituitary	Increases loss of water through urine
B.Norepinephrine	Adrenal medulla	Increases heartbeat, rate of respiration and alertness
C.Glucagon	Beta-cells of Islets of Langerhans	Stimulates glycogenolysis
D.Prolactin	Anterior pituitary	Regulates growth of mammary glands and milk formation in females