Stream of chloroplasts carries the fixation of:
Correct answer: D. Carbon dioxide
- A. Nitrogen
- B. Oxygen
- C. Carbon monoxide
- D. Carbon dioxide
Explanation
Chloroplasts are the site of photosynthesis in plant cells, where carbon dioxide (CO2) is fixed into organic molecules. The process involves light-dependent reactions in the thylakoid membranes and light-independent reactions in the stroma. The enzyme Rubisco facilitates the fixation of CO2 into glucose during the Calvin Cycle.Option A (Nitrogen): Nitrogen fixation is carried out by specialized bacteria, not chloroplasts.Option B (Oxygen): Oxygen is released as a byproduct of photosynthesis, not fixed.Option C (Carbon monoxide): Carbon monoxide is not involved in the photosynthetic process and is harmful to plants.
This question appeared on the ETEA MDCAT 2011 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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