[Solved] Which Gas Is Needed For Photosynthesis?
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Question
Download Solution PDFWhich gas is needed for photosynthesis? This question was previously asked in NTPC CBT-I (Held On: 8 Jan 2021 Shift 2) Download PDF Attempt Online View all RRB NTPC Papers >- Carbon dioxide
- Oxygen
- Hydrogen
- Carbon mono oxide
Answer (Detailed Solution Below)
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Download Solution PDFThe correct answer is Carbon dioxide.
Key Points
- Carbon dioxide gas is needed for photosynthesis.
- The raw materials required for photosynthesis are carbon dioxide, water, and sunlight primarily.
- Plants take in carbon dioxide (CO2) and water (H2O) from the air and soil during photosynthesis.
- During photosynthesis in the plant cell, the water is oxidized, meaning it loses electrons, while the carbon dioxide is reduced, meaning it gains electrons.
- This transforms the water into oxygen and the carbon dioxide into glucose. The plant then releases the oxygen back into the air, and stores energy within the glucose molecules.
Additional Information 
| Gas | Use in photosynthesis |
| Oxygen | Oxygen is evolved during photosynthetic electron transport when water is split by the oxygen-evolving complex to provide protons and electrons to the chloroplastic electron chain, thereby generating ATP and NADPH. the energy source and reducing power for plant metabolism. |
| Hydrogen | During photosynthesis, Hydrogen ions are vital in both aiding proton gradients to help drive the electron transport chain, and for plant respiration. Hydrogen is necessary for building sugars and other molecules to produce glucose for plant energy. |
| Carbon mono oxide | Carbon monoxide does not poison plants since it is rapidly oxidized to form carbon dioxide which is used for photosynthesis. |
Last updated on Jan 20, 2026
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