The NPP in a plant is 100kj. What is the body mass of the secondary carnivore?

Options

A. 100 KJ
B. 10KJ
C. 1KJ
D. 0.1KJ

Answer

To solve the problem of determining the body mass of the secondary carnivore given that the Net Primary Productivity (NPP) in a plant is 100 kJ, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the NPP**: The NPP (Net Primary Productivity) is the amount of energy that plants produce through photosynthesis after accounting for the energy they use for their own respiration. In this case, the NPP is given as 100 kJ.

2. **Apply the 10% Rule**: According to the 10% rule in ecology, only about 10% of the energy from one trophic level is transferred to the next trophic level. This means that when energy is passed from producers (plants) to primary consumers (herbivores), only 10% of the energy is available to the primary consumers.

3. **Calculate Energy for Primary Consumers**:
- If the NPP of the plant is 100 kJ, then the energy available to the primary consumers (herbivores) would be:
\[ \text{Energy for Primary Consumers} = 10\% \times 100 \text{ kJ} = 10 \text{ kJ} \]

4. **Calculate Energy for Secondary Consumers**:
- Again applying the 10% rule, only 10% of the energy available to primary consumers is transferred to secondary consumers (carnivores). Therefore, the energy available to secondary consumers would be:
\[ \text{Energy for Secondary Consumers} = 10\% \times 10 \text{ kJ} = 1 \text{ kJ} \]

5. **Conclusion**: The body mass of the secondary carnivore, which corresponds to the energy available to it, is 1 kJ.

### Final Answer:
The body mass of the secondary carnivore is 1 kJ.

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