A water body characterized by nutrient rich water supports abundant growth of phytoplanktons and other water plants on its surface. Over time, the water body gets filled with a large number of such plants and the process is called Eutrophication. In such water bodies, dissolved oxygen content is nil or very less.
A portion of a river is covered with a green layer of tiny floating organisms L on its surface and the pond water also contains organisms like tadpole, small fish, Alligator. Which of the following is the correct food chain for the above organisms?

Options

A. Algae `to` Tadpole `to` Small fish `to` Alligator
B. Tadpole `to` Small fish `to` Algae `to` Alligator
C. Algae `to` Tadpole `to` Alligator `to` Small fish
D. Algae `to` Alligator `to` Small fish `to` Tadpole

Explanation

To determine the correct food chain for the given organisms in the water body described, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Organisms**:
- The green layer of tiny floating organisms is likely algae, which are primary producers.
- The pond water contains tadpoles, small fish, and alligators.

2. **Establish the Trophic Levels**:
- **Producers**: Algae (first trophic level).
- **Primary Consumers**: Tadpoles (they feed on algae).
- **Secondary Consumers**: Small fish (they may eat tadpoles).
- **Tertiary Consumers**: Alligators (they are at the top of the food chain and may eat small fish).

3. **Construct the Food Chain**:
- Start with the producer: Algae → Tadpole → Small Fish → Alligator.
- This sequence shows the flow of energy from the producers to the top carnivore.

4. **Select the Correct Option**:
- Based on the constructed food chain, the correct answer is: Algae → Tadpole → Small Fish → Alligator.

### Final Answer:
The correct food chain for the organisms described is: **Algae → Tadpole → Small Fish → Alligator**.

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