Consider the following two statements:

l. The annual net primary productivity of the whole biosphere is approximately 170 billion tons (dry weight) of organic matter.
ll. Majority of this is contributed by the oceans as they occupy larger area of earth.

1. Both l and ll are correct and ll explains l

2. Both l and ll are correct but ll does not explain l

3. l is correct but ll is incorrect

4. l is incorrect but ll is correct

Subtopic:  Ecosystem Productivity |
 74%
Level 2: 60%+
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Assertion(A): Primary productivity depends on a variety of environmental factors.
Reason(R): Primary productivity varies in different types of ecosystems.
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Subtopic:  Ecosystem Productivity |
 57%
Level 3: 35%-60%
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