During the water cycle, which part of the plant is involved in the process of transpiration?

Transpiration is the process by which plants lose water in the form of water vapor to the atmosphere.
This occurs mainly through tiny pores called stomata present on the surface of leaves.
When stomata open for gas exchange (taking in carbon dioxide and releasing oxygen), water vapor also escapes.
Thus, leaves are the primary part of the plant involved in transpiration during the water cycle.

Key Points to Remember
Stomata (on leaves) → Main site of transpiration.
Stem and flowers → May lose a little water, but negligible compared to leaves.
Roots → Absorb water, not involved in transpiration.
Therefore, in the water cycle, leaves play the crucial role in transpiration.