Assertion (A): Biofertilizers can be used to avoid soil and water pollution Reason (R): By intensive tree plantation nutrients can be recycled
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When dealing with Assertion-Reason questions, read both statements independently first.
If the reason statement is factually incorrect or lacks physiological accuracy, you can immediately select option (C).
Both (A) and (R) are correct and (R) is the correct explanation to (A)
Both (A) and (R) are correct but (R) is not correct explanation for (A)
(A) is correct (R) is wrong
(A) is wrong (R) is correct
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The Correct Option isC
Solution and Explanation
Step 1: Understanding the Question:
The question presents an Assertion regarding the ecological benefits of biofertilizers and a Reason regarding nutrient recycling via intensive tree plantation.
We need to determine the validity of both statements and see if the Reason explains the Assertion.
Step 2: Key Concepts and Approach:
We evaluate the environmental impacts of biofertilizers versus chemical fertilizers.
We then examine the physiological role of tree plantation on biogeochemical cycles and check for a logical connection.
Step 3: Detailed Explanation:
• Assertion (A): Chemical fertilizers cause severe environmental issues, including soil acidification, loss of beneficial soil microbes, and eutrophication of water bodies due to runoff.
Biofertilizers use living organisms (like Rhizobium, Azotobacter, and mycorrhizal fungi) to naturally enrich soil nutrients without chemical toxicity.
Therefore, they prevent soil and water pollution, making Assertion (A) correct.
• Reason (R): Intensive tree plantation helps in conserving soil structure and preventing erosion.
However, plants extract nutrients from the soil to grow; they do not directly recycle nutrients back to the soil in a manner that substitutes for biofertilizers.
More importantly, tree plantation alone does not explain how or why biofertilizers prevent environmental pollution.
Additionally, the biological mechanism of biofertilizers involves symbiotic nitrogen fixation and phosphorus solubilization, which is distinct from simple vegetative cycling.
Thus, statement (R) is considered incorrect or biologically flawed in the given context.
Step 4: Final Answer:
Assertion (A) is scientifically correct, but Reason (R) is scientifically incorrect.
