In cockroach, the ootheca is formed by the secretion of :

Options

A. phallic gland
B. collaterial gland
C. mushroom gland
D. conglobate gland

Answer

To answer the question "In cockroach, the ootheca is formed by the secretion of:", we will analyze the options provided and determine the correct answer step by step.

### Step-by-Step Solution:

1. **Understanding Ootheca**: The ootheca is a protective case that contains the eggs of cockroaches. It is important to identify which glands are responsible for its formation.

2. **Identifying the Glands**: The options provided include:
- Phallic gland
- Colateral gland
- Mushroom gland
- Conglobate gland

3. **Evaluating Each Option**:
- **Phallic Gland**: This gland is found in male cockroaches and is involved in the formation of the spermatophore, not the ootheca. Therefore, this option is incorrect.
- **Colateral Gland**: This gland is present in female cockroaches and is responsible for secreting the dark and rigid covering of the ootheca. This option is correct.
- **Mushroom Gland**: This gland is also found in male cockroaches and functions as an accessory reproductive gland. Thus, this option is incorrect.
- **Conglobate Gland**: Similar to the phallic gland, this gland is found in males and contributes to the formation of the outer covering of the spermatophore. Therefore, this option is also incorrect.

4. **Conclusion**: Based on the evaluation, the only correct option is the Colateral gland, which is responsible for the secretion that forms the ootheca in female cockroaches.

### Final Answer:
In cockroach, the ootheca is formed by the secretion of **Colateral Gland**.