Consider the two statements:
I. | Elevated atmospheric CO2 increases the instantaneous rate of photosynthesis in C3 plants. |
II. | Current availability of atmospheric CO2 level is limiting to the C3 plants. |
1. | Both I and II are correct and II explains I |
2. | Both I and II are correct but II does not explain I |
3. | I is correct but II is incorrect |
4. | Both I and II are incorrect |
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