Question

How does the water inside plants return to the atmosphere?

Runoff
Evaporation
Precipitation
Transpiration

Answer 1

Transpiration is the correct answer. It's when moisture is carried through plants from roots to stomata on the underside of leaves, where it changes to vapor and is released to the atmosphere.

Answer 2

The right answer is transpiration.

Leaves transpirate by their stomata, small pores that connect the inside of the leaf with the external environment. The plant thus uses phenomena of variations of the opening of the stomata.

Transpiration plays a major role in the water absorption of the plant. It is in fact largely thanks to it that the sap rises in the xylem.