How many of the following structures/organs belong to the male reproductive system of a cockroach?
[Utricular gland, spermatheca, oothecal chamber, Phallic gland, seminal vesicles]

Options

A. None
B. One
C. Two
D. Three

Answer

To determine how many of the listed structures belong to the male reproductive system of a cockroach, we need to analyze each of the given options:

1. **Utricular Gland**: This gland is indeed part of the male reproductive system in cockroaches. It plays a role in the reproductive process.

2. **Spermatheca**: This structure is not part of the male reproductive system; instead, it is found in females and is used for storing sperm after mating.

3. **Oothecal Chamber**: This is also a female reproductive structure. It is where the fertilized eggs are stored and developed.

4. **Phallic Gland**: This gland is part of the male reproductive system. It is involved in the reproductive process.

5. **Seminal Vesicles**: These are present in the male reproductive system and are responsible for storing sperm before it is released during copulation.

Now, let's summarize the findings:

- Utricular Gland: Yes (Male)
- Spermatheca: No (Female)
- Oothecal Chamber: No (Female)
- Phallic Gland: Yes (Male)
- Seminal Vesicles: Yes (Male)

Counting the structures that belong to the male reproductive system, we find:

- Utricular Gland: 1
- Phallic Gland: 1
- Seminal Vesicles: 1

Total = 3 structures.

Thus, the final answer is that **3 of the listed structures belong to the male reproductive system of a cockroach**.