For transpiration, water helps in water loss reduction and water movement throughout the plant. Thermoregulation indotherm it helps in evaporative cooling. In the case of plasma membrane structure it helps in maintenance of phospholipids.
From where we can see that water has various properties such as polarity, specific heat, water potential, ability to move, cohesion,etc. Water is present in all the states that is solid liquid and gas in the earth.
The most common state in which water is found is liquid. Water also helps in movement of object from one place to another such as nutrients, minerals, enzymes etc.