The process responsible for facilitating loss of water in liquid form from the tip of grass blades at night and in early morning is : 

The process of guttation is caused due to root pressure. In this process water is lost from the tip of grass blade at night and in early morning.

Imbibition is a special type of diffusion when water is absorbed by solids – colloids – causing them to increase in volume.

Plasmolysis occurs when water moves out of the cell and the cell membrane of a plant cell shrinks away from its cell wall. This takes place when a cell is placed in a hypertonic solution. 

Transpiration is the evaporative loss of water by plants. It occurs mainly through stomata.