Which of the following is the set of secondary sex organs?

Options

A. Testis, penis, epididymis
B. Ovary, vagina, uterus
C. Penis, vagina, uterus
D. Testis, ovary, epididymis

Answer

To determine the set of secondary sex organs, we need to understand the distinction between primary and secondary sex organs in both males and females. Here’s a step-by-step breakdown of the solution:

### Step-by-Step Solution:

1. **Identify Primary Sex Organs**:
- In males, the primary sex organ is the **testis**, which is responsible for producing sperm (male gametes).
- In females, the primary sex organ is the **ovary**, which produces eggs (female gametes).

2. **Understand Secondary Sex Organs**:
- Secondary sex organs are those that assist in the reproductive process but are not directly involved in gamete production. They include accessory ducts and external genitalia.
- In males, secondary sex organs include:
- **Epididymis**: stores sperm.
- **Vas deferens**: transports sperm.
- **Seminal vesicles** and **prostate gland**: produce seminal fluid.
- **Penis**: external genitalia used for copulation.
- In females, secondary sex organs include:
- **Fallopian tubes**: transport eggs from the ovaries.
- **Uterus**: where a fertilized egg can develop.
- **Vagina**: the canal leading to the external genitalia.

3. **Evaluate the Options**:
- **Option 1**: Testis (primary), so this is incorrect.
- **Option 2**: Ovary (primary), so this is incorrect.
- **Option 3**: Penis (secondary), vagina, and uterus (both secondary), making this option correct.
- **Option 4**: Testis and ovary (both primary), so this is incorrect.

4. **Conclusion**:
- The correct answer is **Option 3**, as it contains the secondary sex organs: penis, vagina, and uterus.