Pheromones secreted by :

Options

A. Endocrine gland
B. Exocrine gland
C. Apocrine gland
D. Mixed gland

Answer

### Step-by-Step Solution:

1. **Understanding Pheromones**: Pheromones are chemical substances produced and released into the environment by an animal, affecting the behavior or physiology of others of its species.

2. **Identifying the Options**: The question provides four options regarding which type of gland secretes pheromones:
- Option 1: Endocrine Gland
- Option 2: Exocrine Gland
- Option 3: Apocrine Gland
- Option 4: Mixed Gland

3. **Evaluating Option 1 - Endocrine Gland**:
- Endocrine glands are ductless glands that secrete hormones directly into the bloodstream.
- Since pheromones are not hormones and are secreted into the environment rather than the bloodstream, this option is incorrect.

4. **Evaluating Option 2 - Exocrine Gland**:
- Exocrine glands secrete their products through ducts to the outside of the body or into the digestive system.
- Pheromones are indeed secreted by exocrine glands, making this option correct.

5. **Evaluating Option 3 - Apocrine Gland**:
- Apocrine glands are a type of exocrine gland that secrete a thicker fluid containing proteins, lipids, and steroids, typically associated with scent.
- While they can produce odorous substances, they are not specifically responsible for pheromone secretion, making this option incorrect.

6. **Evaluating Option 4 - Mixed Gland**:
- Mixed glands (like the pancreas) have both endocrine and exocrine functions.
- However, they do not specifically secrete pheromones, so this option is also incorrect.

7. **Conclusion**: The correct answer is Option 2: Exocrine Gland, as these are the glands responsible for secreting pheromones.

### Final Answer:
Pheromones are secreted by **Exocrine Glands**.