Multiple choice

Photosynthesis in C4- plants is relatively less limited by atmospheric CO2 levels because

  1. the primary fixation of CO2 is mediated via PEP carboxylase.

  2. effective pumping of CO2 into bundlesheath cells.

  3. four carbon acids are the primary initial CO2 fixation products.

  4. rubisco in C4- plants has higher affinity for CO2.
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Explanation

 Photosynthesis in C4- plants is relatively less limited by atmospheric CO2 levels because the primary fixation of CO2 is mediated via PEP carboxylase.

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