How is sulphur important for plants ? Name the amino acids in which it is present.

Explanation

Sulphur (S) us an important macronutrient in plants that is absorbed by the plants as `SO_(4)^(2-)` ion . It mainly functions as a components of vitamins (biotin, thiamine), proteins, coenzyme-A, amino acid (cystein and methionine) etc. It is also an essential component of ally sulphide (onion, garlic)and sinigrin (mustard).
Deficiency of sulphur can lead to chlorosis in young leaves, extensive root growth, formation of hard and woody stem. It also causes the reduction in juice content of citrus fruit and tea yellow disease of tea.
Sulphur is found in amino acids systeine, methionione, etc.