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

(N/A) $\Rightarrow$ Sulphur is a macronutrient. It is absorbed by plants in the form of $SO_{4}^{2-}$ ions.
$\Rightarrow$ It is a structural component of vitamins (biotin and thiamine),coenzyme $A$,and ferredoxin.
$\Rightarrow$ It is essential for the synthesis of specific amino acids and is involved in the formation of secondary metabolites like sinigrin.
$\Rightarrow$ Deficiency of sulphur leads to chlorosis,particularly in younger leaves,and can cause stems to become hard and woody. It also affects the quality of fruits and causes yellowing in tea leaves.
$\Rightarrow$ Sulphur is present in the amino acids $Cysteine$ and $Methionine$.