The Question is from neet-botany photosynthesis-in-higher-plants , and it was created by the author K SURESH KUMAR

Question

Which of the following organisms utilizes a different electron donor than water during photosynthesis, resulting in no oxygen production?

K SURESH KUMAR · Accepted Answer

## CORE INFORMATION
✓ **Answer**: Option D
## CONCEPT FRAMEWORK
 **Primary Concept**: Photosynthesis and electron donors
 **Related Topics**: Anoxygenic photosynthesis, oxygenic photosynthesis, bacterial photosynthesis
 **Prerequisites**: Understanding of the light-dependent reactions of photosynthesis and the role of electron donors and acceptors.
## SOLUTION PATHWAY
**Given Information**:
  The question asks which organism uses an electron donor other than water in photosynthesis.
  Oxygen production is a consequence of water being the electron donor.
**Method & Steps**:
 1. Identify organisms that perform oxygenic photosynthesis.
  Reasoning: Organisms using water as an electron donor in photosynthesis produce oxygen as a byproduct because water is oxidized during the process, releasing electrons and oxygen ($2H_2O ightarrow 4H^+ + 4e^- + O_2$).
  Formula/Rule: $2H_2O ightarrow 4H^+ + 4e^- + O_2$ (Oxygenic photosynthesis)
 2. Identify organisms that perform anoxygenic photosynthesis.
  Working: Anoxygenic photosynthesis uses electron donors other than water, such as hydrogen sulfide ($H_2S$) or thiosulfate ($S_2O_3^{2-}$). This results in the production of elemental sulfur or other oxidized sulfur compounds instead of oxygen.
  Key Point: The absence of oxygen production is a key characteristic of anoxygenic photosynthesis.
 3. Determine the correct organism.
  Result: Purple sulfur bacteria are known to perform anoxygenic photosynthesis using $H_2S$ as an electron donor.
  Verification: Purple sulfur bacteria thrive in environments rich in sulfide and lack oxygen, consistent with anoxygenic photosynthesis.
 ## OPTION ANALYSIS
[A] :x: Algae perform oxygenic photosynthesis, using water as the electron donor.
[B] :x: Ferns perform oxygenic photosynthesis, using water as the electron donor.
[C] :x: Mosses perform oxygenic photosynthesis, using water as the electron donor.
[D] ✓: Purple sulfur bacteria are known for their anoxygenic photosynthesis, using electron donors like hydrogen sulfide ($H_2S$) instead of water, hence no oxygen is produced.
 ## LEARNING AIDS
 **Common Mistakes**:
  1.Confusing oxygenic and anoxygenic photosynthesis:  Remembering that only oxygenic photosynthesis uses water and produces oxygen is crucial.
  2.Associating all photosynthetic organisms with oxygen production:  Not all photosynthetic organisms use water as an electron donor.
 **Quick Tips**:
  1.Remember that anoxygenic photosynthesis typically involves sulfur compounds.
  2.Associate purple sulfur bacteria with sulfide-rich, anaerobic environments.

K SURESH KUMAR · Answer

Algae

K SURESH KUMAR · Answer

Ferns

K SURESH KUMAR · Answer

Mosses

K SURESH KUMAR · Answer

The correct Option is "Purple sulfur bacteria"

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