In male cockroach, from each testis arises a thin vas deferens, which open into through seminal vesicle -

Options

A. Anal cercus
B. Caudal style
C. Collateral gland
D. Ejaculatory duct

Answer

To answer the question regarding the male cockroach's reproductive system, we need to understand the anatomy and function of its components. Here’s a step-by-step breakdown of the solution:

### Step 1: Understand the Male Reproductive System of Cockroach
The male cockroach has a pair of testes which are responsible for producing sperm. Each testis is connected to a thin tube known as the vas deferens.

**Hint:** Remember that the male reproductive system consists of testes and associated ducts.

### Step 2: Identify the Role of Vas Deferens
From each testis, the vas deferens transports the sperm produced in the testes. The vas deferens is a crucial component in the male reproductive system as it carries sperm to the next structure.

**Hint:** Think about how sperm travels from the testes to the outside of the body.

### Step 3: Connection to Seminal Vesicle
The vas deferens from each testis opens into the seminal vesicle. The seminal vesicle is responsible for storing sperm and providing the necessary fluid that nourishes and helps transport the sperm.

**Hint:** Consider what happens to sperm after they are produced in the testes.

### Step 4: Final Pathway - Ejaculatory Duct
The seminal vesicle connects to the ejaculatory duct. This duct is the final pathway through which sperm will exit the male cockroach's body during mating.

**Hint:** Think about the final route that sperm takes before leaving the body.

### Conclusion
Based on the understanding of the male cockroach's reproductive system, the correct answer to the question is that the vas deferens opens into the **ejaculatory duct** through the seminal vesicle.

**Final Answer:** Ejaculatory duct.

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