The process in which loss of water in the form of vapour from the aerial parts of plants takesplace is X which helps in Y. Here X and Y respectively are

The process in which the loss of water in the form of vapor from the aerial parts of plants takes place is called transpiration (X). This process helps in cooling the plant, maintaining nutrient uptake, and facilitating photosynthesis (Y).

Transpiration is crucial for plants as it creates a negative pressure that pulls water and dissolved nutrients from the roots through the xylem to the leaves. Additionally, it aids in cooling the plant's leaves and contributes to the water cycle by returning water vapor to the atmosphere. Furthermore, transpiration helps maintain turgor pressure within the plant cells, which is essential for maintaining structural integrity and enabling various physiological processes.