Question:
Which one of the following photosynthetic organisms does not release oxygen as a by-product of the light reaction?
Which one of the following photosynthetic organisms does not release oxygen as a by-product of the light reaction?
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Anoxygenic photosynthesis does not release oxygen; it uses compounds like sulfur as electron donors.
Updated On: Dec 11, 2025
- Algae
- Cyanobacteria
- Euglena
- Sulphur bacteria
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The Correct Option is D
Solution and Explanation
Step 1: Understanding Photosynthesis.
Photosynthesis involves the production of oxygen as a by-product in organisms that use light for energy, such as plants, algae, and cyanobacteria.
Step 2: Analyzing Organisms.
- Algae: Perform oxygenic photosynthesis, releasing oxygen.
- Cyanobacteria: Also perform oxygenic photosynthesis and release oxygen.
- Euglena: While it is a photosynthetic organism, it also releases oxygen through oxygenic photosynthesis.
- Sulphur bacteria: Perform anoxygenic photosynthesis and do not release oxygen. They use sulfur compounds as electron donors instead.
Step 3: Conclusion.
Hence, the organism that does not release oxygen as a by-product is (D) Sulphur bacteria.
Photosynthesis involves the production of oxygen as a by-product in organisms that use light for energy, such as plants, algae, and cyanobacteria.
Step 2: Analyzing Organisms.
- Algae: Perform oxygenic photosynthesis, releasing oxygen.
- Cyanobacteria: Also perform oxygenic photosynthesis and release oxygen.
- Euglena: While it is a photosynthetic organism, it also releases oxygen through oxygenic photosynthesis.
- Sulphur bacteria: Perform anoxygenic photosynthesis and do not release oxygen. They use sulfur compounds as electron donors instead.
Step 3: Conclusion.
Hence, the organism that does not release oxygen as a by-product is (D) Sulphur bacteria.
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