Question

In cockroach, the conglobate gland occurs in,
(a) Females
(b) Males
(c) Nymph
(d) Both A and B

Answer 1

Cockroaches are dioecious, that is, they exist as two separate sexes. The conglobate gland is also known as the phallic gland. This gland is present only in one of the sexes.

Complete step by step answer:
- The conglobate gland, also known as the phallic gland, is present in male cockroaches. It is an elongated and club-shaped gland.
- They are believed to be involved in the formation of the spermatophore, specifically the outer layer.
- The anterior end is broad and begins in the 6th segment and lies slightly right to the nerve cord. Posteriorly, it narrows into a tubular structure and opens to a separate aperture to the side of the male genital pore.
So, the correct answer is ‘Males’.

Additional Information:
- The internal male reproductive system of cockroach consists of a pair of testes, vasa deferentia, ejaculatory duct, utricular gland, and conglobate gland.
- The internal female reproductive system has a pair of ovaries, a vagina, a genital pouch, collateral glands, and spermatheca.
- Glands specific to female cockroaches are the collateral glands. The pair of the glands join and open into the dorsal side of the genital chamber.

Note:
- Cockroaches are dioecious in nature - they have separate male and female sexes.
- Both male and female cockroaches display external genitalia.
- The male external genitalia consists of three phallomeres or male gonapophyses. They surround the male gonopore at the end of the abdomen. The female external genitalia consists of an ovipositor formed by two gonapophyses. They lie concealed in the gynatrium. The ovipositor is used to conduct fertilized eggs to the oothecal chamber.