Which one is saprophytic in nutrition

Options

A. Fungi
B. Cyanobacteria
C. Viruses
D. All the above.

Answer

### Step-by-Step Solution:

1. **Understanding Saprophytic Nutrition**:
- Saprophytic nutrition refers to the mode of nutrition where organisms obtain their food by decomposing dead and decaying organic matter. These organisms are known as saprophytes.

2. **Analyzing the Options**:
- The options provided are fungi, cyanobacteria, viruses, or all of the above.

3. **Evaluating Fungi**:
- Fungi are known to have a heterotrophic mode of nutrition, which means they cannot produce their own food. They can be saprophytic as they absorb nutrients from dead and decaying organic matter. Therefore, fungi can be classified as saprophytes.

4. **Evaluating Cyanobacteria**:
- Cyanobacteria, also known as blue-green algae, are prokaryotic organisms that can perform photosynthesis. This means they are autotrophic, as they produce their own food. Hence, they do not fall under saprophytic nutrition.

5. **Evaluating Viruses**:
- Viruses do not have a mode of nutrition. They require a host cell to replicate and do not absorb nutrients from their environment. Therefore, they cannot be classified as saprophytes.

6. **Conclusion**:
- Based on the analysis, the only organism that exhibits saprophytic nutrition is fungi. Thus, the correct answer is **fungi**.

### Final Answer:
The organism that is saprophytic in nutrition is **fungi**.

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