Choose the option which gives the correct order of the organisms in the ascending order of their energy level.

Options

A. Caterpillar, Pea plant, Sparrow, Eagle
B. Sparrow, Caterpillar, Pea plant, Eagle
C. Eagle, Sparrow, Caterpillar, Pea plant
D. Pea plant, Caterpillar, Sparrow, Eagle

Answer

To solve the question of the correct order of organisms in ascending order of their energy level, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Trophic Levels**:
- In an ecosystem, organisms are categorized into different trophic levels based on their role in the food chain. The primary producers (like plants) are at the first trophic level, followed by primary consumers (herbivores), secondary consumers (carnivores), and tertiary consumers (top predators).

2. **List the Organisms**:
- In the given example, we have the following organisms:
- Pea plant (Primary producer)
- Caterpillar (Primary consumer)
- Sparrow (Secondary consumer)
- Eagle (Tertiary consumer)

3. **Determine Energy Levels**:
- According to the 10% law of energy transfer, only 10% of the energy from one trophic level is transferred to the next. This means:
- The pea plant, being a primary producer, has the highest energy level.
- The caterpillar, as a primary consumer, has less energy than the pea plant.
- The sparrow, being a secondary consumer, has even less energy than the caterpillar.
- The eagle, as a tertiary consumer, has the least energy of all.

4. **Arrange in Ascending Order**:
- Based on the energy levels, we can arrange the organisms in ascending order:
- Eagle (lowest energy)
- Sparrow
- Caterpillar
- Pea plant (highest energy)

5. **Select the Correct Option**:
- The correct order of organisms in ascending order of their energy level is: Eagle < Sparrow < Caterpillar < Pea Plant.

### Final Answer:
The correct option that matches this order is option 4.

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