Question:
Oxygen is not produced during photosynthesis by
Oxygen is not produced during photosynthesis by
Updated On: Apr 13, 2026
- Chara
- Green sulphur bacteria
- Cycas
- Nostoc
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The Correct Option is B
Solution and Explanation
To solve this question, we need to identify which organism among the given options does not produce oxygen during photosynthesis. Let's analyze the options:
- Chara: Chara is a genus of green algae, and like most green plants, they perform oxygenic photosynthesis, which involves the release of oxygen. Therefore, Chara does produce oxygen during photosynthesis.
- Green sulphur bacteria: These are a group of photosynthetic bacteria that perform anoxygenic photosynthesis. Instead of using water as an electron donor (as in oxygenic photosynthesis), they use other compounds like hydrogen sulfide (H2S) and do not release oxygen as a by-product. This makes them different from typical photosynthetic organisms like plants and algae.
- Cycas: Cycas is a genus of gymnosperm, which performs oxygenic photosynthesis and releases oxygen as a by-product.
- Nostoc: Nostoc is a genus of cyanobacteria, commonly known as blue-green algae, and it performs oxygenic photosynthesis, producing oxygen as a by-product.
Based on this analysis, the organism that does not produce oxygen during photosynthesis is green sulphur bacteria.
Conclusion: The correct answer is Green sulphur bacteria.
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Concepts Used:
Photosynthesis in Higher Plants
Processes Of Photosynthesis in Higher Plants:
Photosynthesis in higher plants involves the following processes:
- Light Reaction
- Dark Reaction
Light Reaction:
- This phenomenon occurs in the presence of light.
- The pigment absorbs light and produces energy in the form of ATP.
- The process involves- absorption of light, water splitting, the release of oxygen, and formation of ATP and NADPH.
Dark Reaction:
This process occurs in the absence of light in the stroma of the chloroplasts. The following cycles are involved in the process:
- Calvin Cycle (C3 Cycle)
- C4 Cycle (Hatch and Slack Pathway)