What is the main difference between male and female cockroach ?

Options

A. (a) jointed appendages
B. (b) paired antennae
C. (c) anal cerci
D. (d) conglobate gland

Answer

To answer the question about the main differences between male and female cockroaches, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Reproductive Organs**:
- Male cockroaches have testes located on the 4th and 6th abdominal segments.
- Female cockroaches possess a pair of ovaries situated on the 2nd and 6th abdominal segments.

2. **Examine Specialized Glands**:
- Male cockroaches have a special gland known as the conglobate gland (or phallic gland), which is responsible for producing spermatophores that contain sperm.
- Female cockroaches have collateral glands that are involved in the formation of the ootheca, which is the egg case that holds the eggs.

3. **Analyze Other Features**:
- Both male and female cockroaches have jointed appendages for movement, paired antennae for the sense of touch, and anal cerci that serve similar functions in both sexes.

4. **Determine the Key Difference**:
- The main distinguishing feature between male and female cockroaches is the presence of the conglobate gland in males, which is not found in females. This gland is crucial for reproduction as it aids in the production of spermatophores.

5. **Conclude the Answer**:
- Therefore, the primary difference between male and female cockroaches is the presence of the conglobate gland in males, which is responsible for spermatophore production.

### Final Answer:
The main difference between male and female cockroaches is the presence of the conglobate gland in males, which is responsible for producing spermatophores, while females have collateral glands for forming the ootheca.