why doesn't the term 'circulation' apply to water transport in plant?

Answer 1

I'm not a 100% sure, so someone correct me if I'm wrong.

When water reaches the leaf cells of the plant via xylem, it is either used up for photosynthesis or is removed from the plant by transpiration. Whereas in animals once the blood transports oxygen to the cells and get deoxygenated, it is once again circulated to the lungs to get oxygenated and pumped to the various tissues and organs by the heart. Hence this term is not used for plants.

Answer 2

to circulate means to move around and around in a certain pathway. in the 'circulatory' system of animals,the blood moves around the animal body in a path of arteries and veins everytime. in plants, water is absorbed from the soil and pumped up the plant in vessels called xylem. when it reaches the leaves it is used for photosynthesis(some of the water escapes from surface of the leaf by transpiration),the water does not then return to the roots of the plant through any route on the plant as in animals. in other words,the water transported up the plant and not 'circulated' around the plant