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NEET 2020
Exam
NEET
Year
2020
Subject
Botany
Chapter
Photosynthesis in Higher Plants

NEET 2020 · Botany · Photosynthesis in Higher Plants

The oxygenation activity of RuBisCO enzyme in photorespiration...

The oxygenation activity of RuBisCO enzyme in photorespiration leads to the formation of

Options

  1. A1 molecule of 3-C compound and 1 molecule of a 2-C compound
  2. B1 molecule of 6-C compound
  3. C1 molecule of 4-C compound and 1 molecule of 2-C compound
  4. D2 molecules of 3-C compound

Correct answer

A. 1 molecule of 3-C compound and 1 molecule of a 2-C compound

Step-by-step solution

C2 cycle or glycolate pathway operates during the daytime in C3 plants & RuBisCO acts as oxygenase at higher concentration of O2 and low CO2 concentration in the C3-green cells. The light-dependent uptake of O2 & release of CO2 in C3 photosynthetic cells is called photorespiration.

RuBP+O2→LowCO2concentration,HighO2concentration,HightemperatureRuBisCO1PGA+1Phosphoglycolate(5C)(3C)(2C)RuBP + {O}_{2}\mathop{\to}_{LowC{O}_{2}concentration, High{O}_{2}concentration, Hightemperature}^{RuBisCO}1PGA + 1Phosphoglycolate ( 5C ) ( 3C ) ( 2C )

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