Respiratory organ of insects are `:-`

Options

A. 1)General Body surface
B. 2)Book lungs
C. 3) Lungs
D. 4)Tracheal tubes

Answer

**Step-by-Step Solution:**

1. **Identify the Question**: The question asks about the respiratory organs of insects.

2. **Review the Options**: The options provided are:
- A) General body surface
- B) Book lungs
- C) Lungs
- D) Tracheal tubes

3. **Analyze Each Option**:
- **Option A: General body surface**: This is a respiratory organ found in earthworms and some amphibians, not insects. Therefore, this option is incorrect.
- **Option B: Book lungs**: Book lungs are respiratory organs found in arachnids, such as spiders and scorpions. This is also incorrect for insects.
- **Option C: Lungs**: Lungs are respiratory organs found in mammals and birds. Hence, this option is incorrect for insects.
- **Option D: Tracheal tubes**: Insects possess a tracheal system, which consists of a network of small tubes known as tracheal tubes. This system is specifically adapted for gas exchange in insects.

4. **Conclusion**: After analyzing all the options, the correct answer is **D) Tracheal tubes**.