Which of the following structure is are not present in the male genital part of a cockroach ?
(i) Ejaculatory duct (ii) Vasa differentia (iii) seminal vesicle (iv) Vestibulum (v) Phallomere of

Options

A. i,ii, iii,iv,v
B. i iii only
C. Only iv
D. i , iii, iv,v

Answer

To solve the question regarding which structures are not present in the male genital part of a cockroach, we will analyze each option provided:

1. **Ejaculatory Duct**: This structure is present in the male reproductive system of a cockroach. It serves as the passage through which semen is expelled during mating.

2. **Vasa Differentia**: This structure is also present in the male reproductive system. The vasa differentia are tubes that connect the testes to the seminal vesicles, allowing for the transport of sperm.

3. **Seminal Vesicle**: This structure is found in the male genital system of cockroaches. The seminal vesicles store sperm produced by the testes until they are needed for reproduction.

4. **Vestibulum**: This structure is **not** present in the male reproductive system of a cockroach. The vestibulum is typically associated with the female reproductive system, serving as a passageway.

5. **Phallomere**: This structure is present in the male genitalia of cockroaches. The phallomere is involved in the reproductive process and plays a role in the transfer of sperm.

Based on this analysis, the structure that is not present in the male genital part of a cockroach is the **Vestibulum**.

**Final Answer**: (iv) Vestibulum

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