Question

Loss of water from the leaves in the form of water vapour is called---------​

Answer 1

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The bulk of this water absorbed, however, takes no permanent part in its develop­ment or in metabolic processes, but evaporates into the air from the leaves and other aerial parts. This loss of water in the form of vapour from living plants, particularly from the aerial parts, is known as transpiration. The process is in principle one of evaporation and diffusion....

Answer 2

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Transpiration.

Overall, this uptake of water at the roots, transport of water through plant tissues, and release of vapor by leaves is known as transpiration. Water also evaporates directly into the atmosphere from soil in the vicinity of the plant.

What comes out of leaves in the form of Vapour and this is called?

Water comes out of leaves in the form of vapour by a process called transpiration.  For this, they use water and carbon dioxide from air. This process is called photosynthesis. Oxygen is given out in this process.

Transpiration is the loss of water from the plant through evaporation at the leaf surface. Evaporation from the mesophyll cells produces a negative water potential gradient that causes water to move upwards from the roots through the xylem.