If 10 joules of energy is available at the producer level, then amount of energy present at the level of secondary consumer is

Options

A. 10J
B. 1J
C. 0.1J
D. 0.01J.

Explanation

To solve the question regarding the amount of energy present at the level of secondary consumers when 10 joules of energy is available at the producer level, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Energy at the Producer Level**:
- Given that the energy available at the producer level is 10 joules.

2. **Apply the 10% Law of Energy Transfer**:
- According to the 10% law, only 10% of the energy from one trophic level is transferred to the next trophic level.
- Therefore, the energy available to the primary consumers (herbivores) can be calculated as:
\[ \text{Energy at Primary Consumer} = 10\% \text{ of } 10 \text{ joules} = 0.10 \times 10 = 1 \text{ joule} \]

3. **Calculate the Energy for the Secondary Consumers**:
- Now, we apply the 10% rule again to find the energy available to the secondary consumers (carnivores).
- The energy available to the secondary consumers can be calculated as:
\[ \text{Energy at Secondary Consumer} = 10\% \text{ of } 1 \text{ joule} = 0.10 \times 1 = 0.1 \text{ joules} \]

4. **Conclusion**:
- Therefore, the amount of energy present at the level of secondary consumers is 0.1 joules.

### Final Answer:
The amount of energy present at the level of secondary consumers is **0.1 joules**.

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