Question

In male cockroaches, sperms are stored in which part of the reproductive system?
A. Testes
B. Vas deferens
C. Seminal vesicle
D. Mushroom glands

Answer 1

Hint: The male reproductive system consists of testes, vasa deferentia, ejaculatory duct, mushroom gland, seminal vesicle, phallic gland, genital pouch, and external genitalia, all located in the abdomen.

Complete answer:
> Option-A-Testes: Testes are present on either dorsolateral side of 4th and 6th abdominal segments. Each testis is three-lobed and consists of numerous(30-40) small whitish transparent follicles arranged in a longitudinal series around a narrow, delicate vas deferens, into which they discharge their products (sperms). In adult cockroaches, testes become non-functional and greatly reduced in size. Their function is to produce sperm not to store sperm.
> Option-B-Vas deferens: These (Vas deferens) are paired structures, one from each testis, run posteriorly and downwards to open into the ejaculatory duct. Vas deferens just connect the testis to the ejaculatory duct, they do not store sperm.
> Option-C-Seminal vesicle: Seminal vesicles present on the ventral surface of the anterior part of the ejaculatory duct are two groups of numerous small glistening white sacs constituting the seminal vesicle meant for storage of sperms. So, this is the right answer.
> Option-D-Mushroom gland: The junction of two vasa deferentia and the ejaculatory duct is surrounded by an elaborate mushroom gland consisting of numerous compact,finger-like blind tubules arranged in two distinct groups, and opening into the anterior part of the ejaculatory duct. The mushroom glands secrete secretion which nourishes sperm but they do not store sperm.

So, the correct answer to this question is an Option-C "Seminal vesicle".

Note:
Male cockroaches are smaller. Their abdomen has 9 distinct segments. Hind end of the abdomen is sharp and somewhat pointed. The seventh sternite is undivided. A pair of anal styles are articulated with 9th abdominal sternite. Wings relatively large; extend somewhat beyond the hind end of the body.