Question

What is transpiration and how does it occur?

Answer 1

Answer:

Transpiration is the evaporation of water from plants. It occurs mostly at the leaves while their stomata (small pores on the underside of leaves) are open for the movement of CO2 and O2 during photosynthesis. It can also occur in flowers and stems.

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Answer 2

Transpiration is the evaporation of water from plants. It occurs chiefly at the leaves while their stomata are open for the passage of CO2 and O2 during photosynthesis.

But air that is not fully saturated with water vapor (100% relative humidity) will dry the surfaces of cells with which it comes in contact. So the photosynthesizing leaf loses substantial amount of water by evaporation. This transpired water must be replaced by the transport of more water from the soil to the leaves through the xylem of the roots and stem.