Which of the following statements is correct regarding cockroach ?

Options

A. (a) It possesses ventral nerve cord
B. (b) Its spiracles help in excretion
C. (c) Phallomere is present in female cockroach
D. (d) Compound eye is also called as ocellus

Explanation

To determine which statement is correct regarding cockroaches, we will analyze each of the provided statements one by one.

### Step-by-Step Solution:

1. **Evaluate Statement A**: "It possesses a ventral nerve cord."
- Cockroaches, being arthropods, have a ventral nerve cord. This is a characteristic feature of many invertebrates, where the nerve cord is located on the ventral side (the belly side) of the body.
- **Conclusion**: This statement is **correct**.

2. **Evaluate Statement B**: "Its spiracles help in excretion."
- Spiracles are small openings found on the body of cockroaches that are primarily involved in respiration. They allow air to enter the tracheal system for gas exchange (oxygen intake and carbon dioxide release).
- **Conclusion**: This statement is **incorrect** because spiracles do not assist in excretion.

3. **Evaluate Statement C**: "Phallomere is present in a female cockroach."
- The phallomere is a structure found in male cockroaches, which is used for the transfer of spermatophores during mating. Female cockroaches do not possess this structure.
- **Conclusion**: This statement is **incorrect**.

4. **Evaluate Statement D**: "Compound eye is also called as ocellus."
- In cockroaches, the compound eyes are made up of multiple units called ommatidia. The term "ocellus" refers to simple eyes, which are different from compound eyes.
- **Conclusion**: This statement is **incorrect**.

### Final Answer:
After evaluating all the statements, the only correct statement regarding cockroaches is:
- **Option A**: "It possesses a ventral nerve cord."