The energy available to the organism at the third trophic level is called

Options

A. gross primary productivity
B. net primary productivity
C. secondary productivity
D. primary productivity

Answer

To solve the question about the energy available to organisms at the third trophic level, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Trophic Levels**:
- Trophic levels represent the position of organisms in a food chain. The first trophic level consists of producers (plants), the second level consists of herbivores (primary consumers), and the third level consists of carnivores (secondary consumers).

2. **Identify the Organisms at Each Trophic Level**:
- First Trophic Level: Producers (e.g., plants)
- Second Trophic Level: Herbivores (e.g., cows, grasshoppers)
- Third Trophic Level: Carnivores (e.g., wolves)

3. **Define Productivity**:
- Productivity refers to the rate of production of biomass. There are two main types of productivity:
- **Primary Productivity**: The organic matter produced by plants during photosynthesis.
- **Secondary Productivity**: The rate of formation of new organic matter by consumers (herbivores and carnivores).

4. **Determine the Energy Available at the Third Trophic Level**:
- The energy available to organisms at the third trophic level is derived from the energy that has been transferred from the first and second trophic levels.
- Since the third trophic level consists of carnivores, the energy they utilize comes from the herbivores (second trophic level), which in turn derive energy from the producers (first trophic level).

5. **Identify the Correct Term**:
- The energy available to the organisms at the third trophic level is referred to as **Secondary Productivity**. This is because it represents the energy that is available to the carnivores after being transferred from the herbivores.

### Final Answer:
The energy available to the organism at the third trophic level is called **Secondary Productivity**.