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, "If 10 joules of energy is available at the producer level, then the amount of energy present at the level of secondary consumer is," we can follow these steps:

### Step-by-Step Solution:

1. **Understand Energy Transfer in Ecosystems**: In an ecosystem, energy flows from one trophic level to another. Typically, only about 10% of the energy from one level is transferred to the next level. This is known as the 10% Rule.

2. **Identify the Energy at the Producer Level**: According to the question, the energy available at the producer level is 10 joules.

3. **Calculate Energy at the Primary Consumer Level**:
- Since only 10% of the energy is transferred from producers to primary consumers, we calculate:
\[ \text{Energy at Primary Consumer} = \text{Energy at Producer} \times 10\% = 10 \, \text{joules} \times \frac{10}{100} = 1 \, \text{joule} \]

4. **Calculate Energy at the Secondary Consumer Level**:
- Again, applying the 10% rule, we find the energy transferred from primary consumers to secondary consumers:
\[ \text{Energy at Secondary Consumer} = \text{Energy at Primary Consumer} \times 10\% = 1 \, \text{joule} \times \frac{10}{100} = 0.1 \, \text{joule} \]

5. **Conclusion**: Therefore, the amount of energy present at the level of the secondary consumer is 0.1 joules.

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

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