Which of the following play a greet role in recycling nutrients like N, P, and S-

Options

A. Chemosynthetic autotrophic bacteria
B. Parasitic bacteria
C. Photoautotrophic bacteria
D. Cyanobacteria

Answer

**Step-by-Step Solution:**

1. **Understanding the Question:**
The question asks which group of organisms plays a significant role in recycling nutrients such as nitrogen (N), phosphorus (P), and sulfur (S).

2. **Analyzing the Options:**
We have four options to consider:
- A. Chemosynthetic Autotrophic Bacteria
- B. Parasitic Bacteria
- C. Photoautotrophic Bacteria
- D. Cyanobacteria

3. **Role of Each Option:**
- **Chemosynthetic Autotrophic Bacteria:** These bacteria oxidize inorganic substances and convert them into organic compounds. They are crucial in nutrient cycling, particularly in the nitrogen cycle, where they convert ammonia into nitrites and nitrates, which are essential for plant growth.
- **Parasitic Bacteria:** These bacteria derive nutrients from their hosts and do not play a significant role in nutrient recycling.
- **Photoautotrophic Bacteria:** While they perform photosynthesis, they are not primarily responsible for recycling nitrogen, phosphorus, and sulfur.
- **Cyanobacteria:** Although they can fix nitrogen, their primary role is not as significant in the recycling of phosphorus and sulfur compared to chemosynthetic autotrophic bacteria.

4. **Identifying the Correct Answer:**
Based on the analysis, the group that plays the greatest role in recycling nutrients like nitrogen, phosphorus, and sulfur is **Chemosynthetic Autotrophic Bacteria**.

5. **Conclusion:**
Therefore, the correct answer to the question is **A. Chemosynthetic Autotrophic Bacteria**.

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