Which of the following characters is not related to Aves:-

Options

A. Homeothermy and presence of oil glands in skin
B. Female genital organs of both sides functional
C. Female genital organs of one sides functional
D. Exoskeleton of feathers

Answer

To determine which character is not related to Aves (birds), we will analyze each of the given options step by step.

### Step-by-Step Solution:

1. **Understanding Aves Characteristics**:
- Aves, or birds, are characterized by certain features such as feathers, beaks, and the ability to maintain a constant body temperature (homeothermy).
- They also possess unique adaptations like hollow bones and specific reproductive systems.

2. **Analyzing the First Option**:
- **Homeothermy and Presence of Oil Glands in Skin**:
- Homeothermy refers to the ability to maintain a stable internal body temperature regardless of external conditions. This is indeed a characteristic of birds.
- Oil glands, specifically the preen glands, are present in birds to help maintain their feathers.
- **Conclusion**: This option is related to Aves.

3. **Analyzing the Second Option**:
- **Female Genital Organs of Both Sides Functional**:
- In birds, typically only one ovary (the left one) is functional. The right ovary and oviduct are usually non-functional.
- **Conclusion**: This option is NOT related to Aves.

4. **Analyzing the Third Option**:
- **Female Genital Organs of One Side Functional**:
- This statement aligns with the known reproductive anatomy of birds, where usually only the left side is functional.
- **Conclusion**: This option is related to Aves.

5. **Analyzing the Fourth Option**:
- **Exoskeleton of Feathers**:
- Feathers are a defining characteristic of birds, and they are considered a form of exoskeleton.
- **Conclusion**: This option is related to Aves.

### Final Conclusion:
The character that is NOT related to Aves is **"Female genital organs of both sides functional."**

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