Which element is responsible for maintaining the turgidity of cells?

Which one of the following is very rich in magnesium?

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

Which of the following elements is a component of ferredoxin?

Which of the following mineral elements is a component of ferredoxin?

$S$ - Statement: Sulfur is present in the structure of cysteine and methionine amino acids.
$R$ - Reason: Phosphorus does not participate in energy exchange processes.