In cockroach, the ootheca is formed by the secretion of

Options

A. (a) phallic gland
B. (b) collaterial gland
C. (c) mushroom gland
D. (d) conglobate gland

Explanation

To solve the question regarding the formation of ootheca in cockroaches, we can follow these steps:

### Step-by-Step Solution:

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

2. **Identifying the Glands**:
- The question provides four options:
- A) Phallic gland
- B) Collateral gland
- C) Mushroom gland
- D) Conglobate gland

3. **Researching the Glands**:
- Each of these glands has different functions in the reproductive system of cockroaches.
- The **collateral glands** are specifically known to be part of the female reproductive system and are responsible for secreting the material that forms the ootheca.

4. **Describing the Collateral Glands**:
- The collateral glands are branched and tubular in structure.
- They open independently on the dorsal side of the genital chamber.
- These glands continuously secrete a fluid that forms the oothecal covering.

5. **Conclusion**:
- Based on the information gathered, the correct answer to the question is **option B, collateral glands**, as they are responsible for the secretion that forms the ootheca.

### Final Answer:
The ootheca in cockroaches is formed by the secretion of **option B: collateral glands**.

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