Which one of these pair is exclusively of vestigial organs of human ?

Question

Accepted Answer

Option 1, which includes the coccyx and pinna muscles, is the correct answer because both of these are considered vestigial organs in humans. Vestigial organs are structures that have lost most or all of their original function through the course of evolution.

1. **Coccyx**: The coccyx, or tailbone, is a vestigial structure in humans. It is the remnant of a tail that our distant ancestors used for balance and mobility. In humans, it no longer serves this purpose, although it does provide attachment for certain muscles, tendons, and ligaments.

2. **Pinna Muscles**: The pinna muscles are small muscles around the outer ear. In many animals, these muscles allow for movement of the ears to better capture sound. In humans, however, these muscles are largely non-functional, as most people cannot move their ears significantly. This makes them vestigial.

Now, let's examine why the other options are incorrect:

2. **Coccyx and Premolar**: While the coccyx is vestigial, premolars are not. Premolars are functional teeth used for grinding food, and they play an active role in the human digestive process.

3. **Coccyx and Intercostal Muscles**: The coccyx is vestigial, but intercostal muscles are not. Intercostal muscles are essential for respiration as they help expand and contract the ribcage during breathing.

4. **Coccyx and Facial Hair in Women**: The coccyx is vestigial, but facial hair in women is not considered a vestigial organ. Facial hair is a secondary sexual characteristic influenced by hormonal levels and does not fit the definition of a vestigial structure.

In conclusion, Option 1 is the correct choice because both the coccyx and pinna muscles are vestigial organs in humans, whereas the other options include structures that are not vestigial.