Q. Assertion: Deficiency of sulphur causes chlorosis in plants.Reason: Sulphur is a constituent of chlorophyll, proteins and nucleic acids.

1. Both the Assertion and the Reason are true and the Reason is a correct explanation of the Assertion.
2. Both the Assertion and the Reason are true but the Reason is not a correct explanation of Assertion.
3. Assertion is true but the Reason is false.
4. Both the Assertion and the Reason are false.