Mark the odd one (w.r.t.second trophic level)

Options

A. Wolf
B. Grassshopper
C. Cow
D. Zooplanktons

Answer

### Step-by-Step Solution:

1. **Understand Trophic Levels**: Trophic levels represent the position of an organism in a food chain. The first trophic level (T1) consists of producers (plants), the second trophic level (T2) consists of primary consumers (herbivores), and the third trophic level (T3) consists of secondary consumers (carnivores).

2. **Identify the Organisms**: The question provides four options:
- Wolf
- Grasshopper
- Cow
- Zooplankton

3. **Determine the Trophic Levels**:
- **Wolf**: In food chains, wolves are typically at the T3 level as they are secondary consumers.
- **Grasshopper**: Grasshoppers are primary consumers (T2) as they feed on plants.
- **Cow**: Cows are also primary consumers (T2) as they graze on grass.
- **Zooplankton**: Zooplankton are primary consumers (T2) in aquatic ecosystems, feeding on phytoplankton.

4. **Compare the Trophic Levels**:
- Wolf: T3
- Grasshopper: T2
- Cow: T2
- Zooplankton: T2

5. **Identify the Odd One Out**: Since the wolf is the only organism that occupies the T3 level, while the grasshopper, cow, and zooplankton all occupy the T2 level, the odd one out is the wolf.

6. **Conclusion**: The answer to the question is the wolf.