Question

what is it called when plants lose water through their leaves?
a. transpiration
b. runoff
c. percolation
d. respiration

Explanation:

Transpiration is the process by which plants lose water vapor through their leaves (specifically through stomata). Runoff refers to water flowing over land (like after rainfall). Percolation is water seeping through soil. Respiration in plants is about gas exchange (taking in oxygen and releasing carbon dioxide, not water loss like in this question). So the correct term for water loss through leaves is transpiration.

Answer:

A. Transpiration