Assertion:  Entire operations of cultivation from ploughing to harvesting are done manually in extensive commercial grain cultivation. Reasoning:  In Extensive commercial grain cultivation the size of the farm is very large.

Both (A) and (R) are true and (R) is the correct explanation of (A) Both (A) and (R) are true but (R) is not the correct explanation of (A) (A) is true and (R) is false (A) is false and (R) is true

(A) is false and (R) is true

The size of the farm is very large, therefore entire operations of cultivation from ploughing to harvesting are mechanised.