Final answer:
The liquid found in the roots, stems, and leaves of plants is called sap. Water is essential for plants as it supports various functions and is utilized in photosynthesis.
Step-by-step explanation:
The liquid found in the roots, stems, and leaves of plants is called sap.
Plant roots absorb water from the soil through root hairs and transport it up to the leaves through a structure called the xylem. The transport of water and nutrients in plants is aided by cohesion and adhesion properties of water molecules.
Water is essential for plants as it supports cell structure, carries nutrients, and is utilized in the process of photosynthesis.