During photorespiration, ribulose biphosphate carboxylase combines with oxygen gas whichresults in lowering the overall rate of:
Correct answer: D. Carbon dioxide fixation
- A. ADP synthesis
- B. NAD formation
- C. Nitrogen fixation
- D. Carbon dioxide fixation
Explanation
During photorespiration, ribulose biphosphate carboxylase (RuBisCO) combines with oxygen instead of carbon dioxide, leading to a process that releases carbon dioxide and consumes energy, ultimately reducing the efficiency of carbon dioxide fixation. This process competes with the Calvin cycle, which is responsible for carbon fixation in photosynthesis. Thus, the presence of oxygen decreases the overall rate of carbon dioxide fixation.
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About Plant Nutrition and Transport
Plants require macronutrients and micronutrients for growth, and mineral deficiencies produce recognizable symptoms. Transport involves water and minerals through xylem by transpiration pull, cohesion and adhesion, while phloem translocates sugars from sources to sinks. Root pressure and transpiration are distinct mechanisms.
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