Slime moulds are

Options

A. Photosynthetic
B. Parasitic
C. Symbiotic
D. Saprophytic.

Answer

### Step-by-Step Solution:

1. **Understanding Slime Moulds**:
- Slime moulds are a type of protist that can be found in decaying organic matter. They are not plants, animals, or fungi but belong to their own group within the kingdom Protista.

2. **Nutrition Type**:
- To determine the correct option regarding the nutrition of slime moulds, we need to analyze the options provided:
- **Photosynthetic**: This refers to organisms that produce their own food using sunlight (like plants). Slime moulds do not perform photosynthesis.
- **Parasynthetic**: This term is not commonly used in biological contexts and does not apply to slime moulds.
- **Symbiotic**: This refers to organisms that live in close association with another organism, often to the mutual benefit of both. Slime moulds do not primarily rely on this type of relationship for nutrition.
- **Saprophytic**: This refers to organisms that obtain their nutrients by feeding on dead and decaying organic matter. Slime moulds fit this description perfectly as they thrive on decaying twigs and other organic debris.

3. **Conclusion**:
- Based on the analysis, slime moulds are best described as saprophytic organisms. Therefore, the correct answer is option 4: **saprophytic**.