Assertion (A) : Plants absorb sulphur in the form of sulphate ions.
Reason (R ) : Sulphur bacteria are required for the formation of sulphate .

Options

A. If both assertion and reason are true reason is the correct explanation of assertion
B. If both assertion and reason are true but reason is not the correct explanation of assertion
C. If assertion is true but reason is false
D. If both assertion and reason are false.

Answer

A

Explanation

Both assertion and reason are true an reason is the correct explanation of assertion.
Organic sulphur is made available to the plant through biological oxidation through the activity of certain microorganisms. Sulphur is tranformed from the organic form to the sulfate ion, the form of sulphur that higher plants absorb. Soil microorganisms oxidize not only organic sulphur but also sulphide minerals such as ferrous sulphide. The elemental sulphur is then oxidizd to sulphate by sulphur bacteria.