Which one of the following shows detritus food chain?

Options

A. Organic waste `to` Bacteria `to` Molluscs
B. Grass `to` Insects `to` Snakes
C. Plankton `to` Small fishes `to` Large fishes
D. All of the above

Answer

To determine which option shows a detritus food chain, we need to understand what a detritus food chain is and analyze the given options accordingly.

### Step-by-Step Solution:

1. **Understand the Detritus Food Chain**:
- A detritus food chain starts with dead organic matter (detritus) such as decaying leaves, dead animals, or organic waste.
- This dead organic matter is then broken down by decomposers, which include bacteria and fungi.
- The decomposers convert the dead matter into nutrients, which are then consumed by detritivores or other organisms in the food chain.

2. **Analyze the Options**:
- **Option 1**: Organic waste → Bacteria → Mollusks
- This option starts with organic waste (dead matter), which is consumed by bacteria (decomposers), and then bacteria are consumed by mollusks. This fits the definition of a detritus food chain.
- **Option 2**: Grass → Insect → Snake
- This option starts with grass (a living plant), which is not dead organic matter. Therefore, it does not represent a detritus food chain.
- **Option 3**: Plankton → Small Fish → Large Fish
- This option starts with plankton (living organisms), which again does not fit the detritus food chain definition.
- **Option 4**: None of the above
- Since we have identified that option 1 is a valid detritus food chain, this option is incorrect.

3. **Conclusion**:
- Based on the analysis, the correct answer is **Option 1**: Organic waste → Bacteria → Mollusks, as it correctly represents a detritus food chain.