Assertion (A) : The main excretory unit ...

Assertion (A) : The main excretory unit of kidney is nephron.
Reason (R) : It carries out filtration, selective absorption and tubular secretion to from urine in kidney.

Both assertion (A) and (R) are true and reason (R) is the correct explanation of assertion (A).

Both assertion (A) and reason (R) are true but reason (R) is not the correct explanation of assertion (A).

Assertion (A) is true but reason (R) is false.

Assertion (A) is false but reason (R) is true.

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Assertion (A): Excretory unit of kidneys are nephrons. Reason (R): It has no role in secretion of urine.

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 but R is false.

A is false and R is true.

If both the assertion and the reason are true and the reason is a correct explanation of the assertion

If both the assertion and the reason are true and the reason is not a correct explanation of the assertion

If the assertion is true but the reason is false

If both the assertion and reason are false

Both A and R is true and R is the correct explanation of A.

Both A and Ris true but Ris not correct explanatioin of A.

A is true but R is false.

A is false but R is true.