Which one of the following statements is correct regarding cockroach ?

Options

A. Head is oval is shape
B. There are 10 pairs of spiracles (2 pairs on thorax and 8 pairs on abdomen)
C. Heart is differentiated into funnel shaped chambers with setae on either side
D. Each eye consists of about 1000 hexagonal ommatidia

Explanation

To determine which statement is correct regarding the cockroach, let's analyze each option step by step.

### Step-by-Step Solution:

1. **Examine the First Statement**:
- The first statement claims that the head of the cockroach is oval in shape.
- **Analysis**: The head of a cockroach is actually triangular in shape, not oval. Therefore, this statement is **incorrect**.

2. **Examine the Second Statement**:
- The second statement states that there are 10 pairs of spiracles, with 2 pairs on the thorax and 8 pairs on the abdomen.
- **Analysis**: This is accurate. Cockroaches have 10 pairs of spiracles, which are small openings used for respiration—2 pairs located on the thorax and 8 pairs on the abdomen. This statement is **correct**.

3. **Examine the Third Statement**:
- The third statement mentions that the heart is differentiated into funnel-shaped chambers with CT (contractile tissue) on the other side.
- **Analysis**: While the heart of a cockroach does have funnel-shaped chambers, it has ostia (openings) on either side for blood entry, not CT. Thus, this statement is **incorrect**.

4. **Examine the Fourth Statement**:
- The fourth statement claims that each eye consists of about 1,000 hexagonal ommatidia.
- **Analysis**: In reality, each compound eye of a cockroach consists of approximately 2,000 hexagonal ommatidia, making this statement **incorrect**.

### Conclusion:
After analyzing all the statements, the correct answer is:
- **Option 2**: There are 10 pairs of spiracles, 2 pairs on the thorax and 8 pairs on the abdomen.