Source. It is available in the form of chlorine gas and as chlorides in soil.

Regions. It is required by every part of a plant.

Functions. It plays an important role in PS II of photosynthesis and transpiration. With Na⁺ and K⁺, chlorine helps in determining solute concentration and anion cation balance in the cells. It is essential for oxygen evolution in photosynthesis.

Deficiency symptoms

(i) Affects the process of photosynthesis.
(ii) Roots become short, thick and club shaped near the tip.
(iii) Appearance of wilted leaves.