Photorespiration involved the following reaction which occurs in the sequence of:
Correct answer: C. RuBP + O2 --> Glycolate, Glycolate --> Glycine, Glycine --> Serine + CO2
- A. Glycolate --> Glycine, Glycine --> Serine + CO2, RuBP + O2 --> Glycolate
- B. RuBP + O2 --> Glycolate, Glycine --> Serine + CO2, Glycolate --> Glycine
- C. RuBP + O2 --> Glycolate, Glycolate --> Glycine, Glycine --> Serine + CO2
- D. Glycine --> Serine + CO2, RuBP + O2 --> Glycolate, Glycolate --> Glycine
Explanation
Photorespiration is a process in plants where RuBP (Ribulose Bisphosphate) reacts with oxygen, rather than carbon dioxide, leading to a series of reactions:1. RuBP + O2 --> Glycolate: RuBP oxygenation is the first step, producing glycolate.2. Glycolate --> Glycine: Glycolate is then converted to glycine.3. Glycine --> Serine + CO2: Finally, glycine is converted to serine with the release of CO2.Option C correctly follows this sequence. Options A, B, and D misrepresent the order of these reactions, either starting with or incorrectly placing the reactions, which makes them incorrect.
This question appeared on the ETEA MDCAT 2016 paper, which you can sit online with every answer explained.
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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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