Explain the male reproductive system of cockroach.

Explanation

Cockroach is direcious or unisexual. They have well developed reproductive organs. The male reproductive system consists of a pair of testes, vasa deferentia, an ejaculatory duct, utricular gland, phallic gland and the external genitalia. A pair of three lobed testes lies on the lateral side of the `4^(th) and 6^(th)` abdominal segments. From each testis arises a thin vas deferens, which opens into the ejaculatory duct through the seminal vesicles. The cjaculatory duct is an elongated duct which opens out by the male gonopore lying ventral to the anus. Autricular or mushroom shaped gland is a large accessory reproductive gland, which opens into the anterior part of the cjaculatory duct. The seminal vesicles are present on the ventral surface of the ejaculatory duct. These sacs store the sperms in the form of bundles called spermatophores. The duct of phallic or conglobate gland also opens near the gonopore, whose function is uncertain. Surrounding the male genital opening are few chitinous and asymmetrical structures called phallomeres or gonapophyses which help in copulation.