Water

• This is another important requirement for photosynthesis.
• The root system of plants enables them to obtain water from the soil.
• The root system consists of a main or primary root, rootlets or secondary roots, and root hair.
• Root hairs increase the surface area of roots, and are found in great numbers near the tips of roots.

• Water and soluble nutrients enter the root hair, pass through the secondary roots, and travel through the main root into the stems and reaches the leaves through structures called xylem.
• Once photosynthesis takes place, starch is formed. This starch is carried to various parts of the plants through structures called phloem.

Passage of water in the roots