Mark the correct match

Options

A. Secondary consumer- Zooplankton
B. Primary coloniser - Viruses
C. Nanoecosystem- Valleyy and forest
D. Omnivores - Cockroaches, Crows

Answer

To solve the question of marking the correct match among the given options, we will analyze each option step by step.

### Step-by-Step Solution:

1. **Evaluate the First Option: Secondary Consumers and Zooplanktons**
- **Analysis**: Zooplanktons are small aquatic organisms that primarily feed on phytoplankton (the producers). Therefore, they are classified as primary consumers, not secondary consumers.
- **Conclusion**: This is a wrong match.

2. **Evaluate the Second Option: Primary Colonizer and Virus**
- **Analysis**: Primary colonizers are organisms that first inhabit an environment to stabilize it, such as certain algae, lichens, and fungi. Viruses, on the other hand, are pathogens and do not stabilize environments; they infect hosts instead.
- **Conclusion**: This is also a wrong match.

3. **Evaluate the Third Option: Nano Ecosystem and Valley and Forests**
- **Analysis**: A nano ecosystem refers to a very small ecosystem, while valleys and forests are large ecosystems (macro ecosystems). Therefore, valleys and forests cannot be classified as nano ecosystems.
- **Conclusion**: This is another wrong match.

4. **Evaluate the Fourth Option: Cockroaches and Crows as Omnivores**
- **Analysis**: Both cockroaches and crows are known to consume both plant and animal matter, which classifies them as omnivores. This matches the definition of omnivores perfectly.
- **Conclusion**: This is the correct match.

### Final Answer:
The only correct pair from the options given is **Cockroaches and Crows - Omnivores**.

---