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JIPMER 2007
Exam
JIPMER
Year
2007
Subject
Botany
Chapter
Photosynthesis in Higher Plants

JIPMER 2007 · Botany · Photosynthesis in Higher Plants

Photosynthesis in C_4 plants is relatively less limited by...

Photosynthesis in C4\mathrm{C}_4 plants is relatively less limited by atmospheric CO2\mathrm{CO}_2 levels because

Options

  1. Afour carbon acids are the primary initial CO2\mathrm{CO}_2 fixation products
  2. Bthe primary fixation of CO2\mathrm{CO}_2 is mediated via PEP carboxylase
  3. Ceffective pumping of CO2\mathrm{CO}_2 into bundle sheath cells
  4. DRUBISCO in CO4\mathrm{CO}_4 plants has higher affinity for CO2\mathrm{CO}_2

Correct answer

B. the primary fixation of CO2\mathrm{CO}_2 is mediated via PEP carboxylase

Step-by-step solution

The fixation of CO2\mathrm{CO}_2 in C4\mathrm{C}_4 plants takes place in two places and by two different organic compounds. Phosphoenol pyruvate (PEP) is found in mesophyll cells which primarily fixes atmospheric CO2\mathrm{CO}_2 into oxaloacetic acid (4C). RUBISCO is present in bundle sheath cells where final fixation of CO2\mathrm{CO}_2 in hexose sugars takes place. CO2\mathrm{CO}_2 is primarily fixed by PEP carboxylase because this enzyme has greater affinity to CO2\mathrm{CO}_2 than RUBISCO.
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