In which of the following animal, respiration occurs without any respiratory organ ?

Options

A. Cockroach
B. Fish
C. Frog
D. Earthworm

Answer

To determine which animal among the options provided (cockroach, fish, frog, earthworm) has respiration occurring without any specialized respiratory organs, we can analyze each option step by step.

### Step-by-Step Solution:

1. **Understand the Question**: The question asks which animal can respire without specialized respiratory organs.

2. **Analyze Each Option**:
- **Cockroach**: Cockroaches have a respiratory system that includes tracheae, which are specialized tubes for gas exchange. Therefore, they do not fit the criteria.
- **Fish**: Fish possess gills, which are specialized organs for extracting oxygen from water. Hence, they also do not meet the requirement.
- **Frog**: Frogs have lungs for breathing air, especially as adults, and they also undergo cutaneous respiration (through the skin) but still possess specialized respiratory organs (lungs). So, they do not qualify.
- **Earthworm**: Earthworms do not have any specialized respiratory organs. They respire through their skin, where gas exchange occurs via diffusion. This means they can breathe without any specialized respiratory structures.

3. **Conclusion**: Based on the analysis, the animal that can respire without any specialized respiratory organs is the **earthworm**.

### Final Answer:
The correct option is **earthworm**.

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