Photosynthesis in plants is relatively less limited by atmospheric levels because
1. The primary fixation of is mediated via PEP carboxylase.
2. Effective pumping of into bundle sheath cells.
3. Four carbon acids are the primary initial fixation products.
4. RuBisCO in plants has higher affinity for
Consider the two statements:
I. The C4 photosynthesis pathway uses more energy than the C3 photosynthesis pathway.
II. C4 plants are able to more efficiently fix carbon in drought, high temperatures, and in limitations of nitrogen or CO2.
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. Only I is correct
4. Both I and II are incorrect
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