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Assertion (A): Threshing efficiency alone is a sufficient measure of a thresher's performance.

Reason (R): Threshing efficiency counts only the grain detached from the head.

Select the correct answer from the options below.

  • A.Both A and R are true, and R is the correct explanation of A
  • B.Both A and R are true, but R is not the correct explanation of A
  • C.A is true but R is false
  • D.A is false but R is true

Answer: D

The definition given is correct and it is exactly why the assertion fails: a machine may detach nearly all the grain while cracking it, losing it in the straw or blowing it away. Four measures at least are needed together.

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