In a terrestrial ecosystem such as forest, maximum energy is at trophic level:

Options

A. `T_(1)`
B. `T_(2)`
C. `T_(3)`
D. `T_(4)`

Explanation

To determine the trophic level at which maximum energy is found in a terrestrial ecosystem such as a forest, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Trophic Levels**: Trophic levels represent the different stages in a food chain, starting from producers to various levels of consumers. The primary levels include:
- T1: Producers (e.g., plants)
- T2: Primary consumers (e.g., herbivores)
- T3: Secondary consumers (e.g., carnivores that eat herbivores)
- T4: Tertiary consumers (e.g., top carnivores)

2. **Identify Energy Distribution**: In an energy pyramid, energy is highest at the producer level (T1) and decreases as you move up through the trophic levels. This is due to the 10% law, which states that only about 10% of the energy from one trophic level is transferred to the next.

3. **Analyze the Energy at Each Level**:
- At T1 (Producers), there is 100% of the energy.
- At T2 (Primary consumers), only 10% of the energy is available.
- At T3 (Secondary consumers), only 1% of the energy is available.
- At T4 (Tertiary consumers), the energy is even less, often around 0.1%.

4. **Conclude the Maximum Energy Level**: Since the producers (T1) have the highest energy (100%), we conclude that maximum energy in a terrestrial ecosystem is found at the producer level.

5. **Final Answer**: Therefore, the trophic level at which maximum energy is present in a terrestrial ecosystem such as a forest is **T1 (Producers)**.