Photosynthesis in plants is relatively less limited by atmospheric levels because
1. | The primary fixation of CO2 is mediated via PEP carboxylase. |
2. | Effective pumping of CO2 into bundle sheath cells. |
3. | Four carbon acids are the primary initial CO2 fixation products. |
4. | RuBisCO in C4 plants has higher affinity for CO2. |
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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