Why is carbon dioxide fixation decreased in some C3 plants?(a) Phosphoglycerate formation(b) Unavailability of RuBP(c) Oxygen binds to RuBisCO(d) Oxygen binds to RuBPThis question was posed to me in an international level competition.This intriguing question comes from Higher Plants Photosynthesis in division Photosynthesis in Higher Plants of Biology – Class 11

Why is carbon dioxide fixation decreased in some C3 plants?(a) Phospho

1.	Why is carbon dioxide fixation decreased in some C3 plants?(a) Phosphoglycerate formation(b) Unavailability of RuBP(c) Oxygen binds to RuBisCO(d) Oxygen binds to RuBPThis question was posed to me in an international level competition.This intriguing question comes from Higher Plants Photosynthesis in division Photosynthesis in Higher Plants of Biology – Class 11
Answer» The CORRECT answer is (c) Oxygen BINDS to RuBisCO To EXPLAIN I would say: The active SITE of RuBisCO can bind to both oxygen and carbon dioxide. When oxygen binds to RuBisCO, carbon dioxide FIXATION is reduced as the active site of RuBisCO is not able to bind to carbon dioxide.

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