Question

Assertion :Sedimentary nutrient cycles of phosphorus, calcium, magnesium, etc., are considered as imperfect cycles. Reason: These cycles get more easily disrupted by local disturbances as the bulk of material remains in the relatively inactive and immobile reservoir on the earth's crust.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

Sedimentary nutrient cycles, e.g., phosphorus calcium, magnesium are less perfect (or imperfect) as they get more easily disrupted by local disturbances as the bulk of material remains in the relatively inactive and immobile reservoir on the earth's crust(lithosphere). On the other hand, gaseous nutrient cycles are rapid and more perfect as compared to sedimentary cycles. It is because in gaseous nutrient cycles, e.g., carbon, hydrogen, oxygen, nitrogen, nutrients remain in circulation more or less uniformly. In these cycles, nutrients self-adjust rather quickly because of large reservoir pool (atmosphere or hydrosphere).

So, the correct answer is 'Both Assertion and Reason are correct and Reason is the correct explanation for Assertion'.