Generally, evapotranspiration depends on two factors. These are:
A. Water must be available for plants to transpire and the air cannot be saturated with humidity.
B. Evaporation must be zero and the air must be saturated.
C. Transpiration must not be present and evaporation must be determined to be below 10 percent.
D. Water must be available for plants to transpire and the air must be saturated with moisture.
E. The roots must be able to provide water through osmosis and the air must be saturated.

A. Water must be available for plants to transpire and the air cannot be saturated with humidity.

Explanation:

Evapotranspiration is the sum of evaporation and transpiration. Evaporation is the loss of water from the earth surface or ground water table and transpiration is lost of water from plant surfaces. Plant absorps water from the soil through the root and it is transport by xylem to various body cells.

When the humidity is high and the air is saturated with water the rate of evapotranspiration is low but at a low humidity the rate of evaporation is high until the air is saturated.

Temperature also have a major role in transpiration. When the temperature is high the plant stomata is open which favours water Loss from plant but when the temperature is low plant closes their stomata in response to temperature change.

Option A.

Water must be available for plants to transpire and the air cannot be saturated with humidity.

Explanation:

Evapotranspiration is the process where water is evaporated from the plant leaves or land to the atmosphere and transpiration I .e a process plants absorb water from their roots and it is evaporated through the leaves pores.

Evapotranspiration is the sum of evaporation and transpiration.

Water must be available for evapotranspiration. It's the water that is evapotranspired and air cannot be saturated by humidity.

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