Statement 1 : Respiration is most efficient in the insects, among the invertebrates.
Statement 2 : In the insects, air is carried directly to the cells by tracheoles.

Options

A. Both statement 1 and 2 correct.
B. Statement 1 is correct but statement 2 is incorrect.
C. Statement 1 is incorrect but statement 2 is correct.
D. Both statement 1 and 2 incorrect.

Answer

### Step-by-Step Solution:

1. **Understanding the Statements**:
- Statement 1 claims that respiration is most efficient in insects among invertebrates.
- Statement 2 states that in insects, air is carried directly to the cells by tracheoles.

2. **Analyzing Statement 1**:
- Insects have a unique respiratory system known as tracheal respiration. This system is characterized by a network of tubes called tracheae that deliver oxygen directly to tissues.
- The efficiency of this system is attributed to its ability to transport oxygen directly to cells without the need for a circulatory system to carry gases, making it one of the most efficient respiratory systems among invertebrates.

3. **Analyzing Statement 2**:
- The tracheal system consists of spiracles (external openings) that allow air to enter the insect's body.
- From the spiracles, air travels through the tracheae and further branches into smaller tubes called tracheoles, which are in direct contact with the cells.
- This direct connection allows for efficient gas exchange, as oxygen can diffuse directly from the tracheoles into the cells.

4. **Conclusion**:
- Both statements are correct. Statement 1 is true because insects have the most efficient respiratory system among invertebrates. Statement 2 is also true because air is indeed carried directly to the cells via tracheoles.

### Final Answer:
Both Statement 1 and Statement 2 are correct.

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