Which of the following is the correct group of vestigal organs in man?

Options

A. Nictitating membrane, ear muscles, eyelids and coccyx
B. Appendix, coccyx, ear muscles and elbow joints
C. Wisdom tooth, coccyx, body hair and ear pinna
D. Wisdom tooth, body hair , nictitating membrane and verniform appendix

Answer

To determine the correct group of vestigial organs in humans, we need to identify which organs are considered vestigial. Vestigial organs are remnants of structures that were fully functional in our ancestors but have lost their primary function over time.

### Step-by-Step Solution:

1. **Understand Vestigial Organs**: Vestigial organs are those that have lost their original function through the course of evolution. In humans, these include structures that are present in a reduced form.

2. **Identify the Options**: The question provides several groups of organs. We need to evaluate each group to see which contains only vestigial organs.

3. **Evaluate Each Group**:
- **Group 1**: Nictitating membrane, ear muscle, eyelids, and coccyx.
- Nictitating membrane: Vestigial (remnant of a third eyelid).
- Ear muscle: Vestigial (auricular muscles).
- Eyelids: Functional (protective covering for the eyes).
- Coccyx: Vestigial (remnant of a tail).
- **Conclusion**: Not all are vestigial.

- **Group 2**: Appendix, coccyx, ear muscle, and albizones.
- Appendix: Vestigial (remnant of a larger cecum).
- Coccyx: Vestigial.
- Ear muscle: Vestigial.
- Albizones: Not a recognized term in human anatomy.
- **Conclusion**: Not all are vestigial and includes an incorrect term.

- **Group 3**: Wisdom tooth, coccyx, body hair, and ear pinna.
- Wisdom tooth: Vestigial (remnant of larger molars).
- Coccyx: Vestigial.
- Body hair: Vestigial (less functional in humans).
- Ear pinna: Functional (outer ear).
- **Conclusion**: Not all are vestigial.

- **Group 4**: Wisdom tooth, body hair, nictitating membrane, and vermiform appendix.
- Wisdom tooth: Vestigial.
- Body hair: Vestigial.
- Nictitating membrane: Vestigial.
- Vermiform appendix: Vestigial.
- **Conclusion**: All are vestigial.

4. **Final Answer**: The correct group of vestigial organs in humans is **Group 4**: Wisdom tooth, body hair, nictitating membrane, and vermiform appendix.