Question

Number of sterna visible in male cockroach is
(a) Nine
(b) Ten
(c) Eight
(d) Eleven

Answer 1

Hint: In cockroaches, both male and female abdomen consists of 10 segments. In males, accessory reproductive glands are called mushroom glands present on the sixth and seventh segment. The number of visible sterna in male cockroaches is two more than that of the female cockroaches.

Complete answer:
In females cockroaches, the seventh sternum is boat- shaped whereas the eighth and the ninth sterna form a genital or brood pouch the anterior part of which contains the female gonopore, spermathecal pores and collateral glands. In males, genital pouch or chamber lies at the buttocks of abdomen bounded dorsally by ninth and tenth terga and ventrally by the ninth sternum, which consists dorsal auns, ventral male genital pore and gonapophysis. In both sexes, the tenth segment bears a pair of jointed filamentous structures called anal cerci.
- In females, the reproductive system consists of two large ovaries present in second and sixth abdominal segments.
- In males, the reproductive system consists of a pair of testes lying one on each within the fourth and sixth segments.
- In males, sperms are stored within the seminal vesicles and are stuck together within the type of bundles called spermatophores which altogether are discharged during copulation.
- In females, sperms are transferred through spermatophores and fertilized eggs are encased during a capsule called ootheca.
So, the right answer is, ‘(a) Nine’

Note:
- The cockroach is nocturnal omnivores which suggest they're active within the dark which they will eat both plant and animal products.
- The exoskeleton of cockroach is roofed by hard chitin which has hardened plates called sclerites that are joined to each other by a thin and versatile articular membrane.
- They have a pair of antennas having sensory receptors which articulate during a pit on the brink of the notches of the attention.
- The forewing is opaque dark called tegmina which is leathery and canopy the hind wind wing which is transparent, membranous and is used on the wing.