Organ and Organ Systems in Animals — Bio Zoology STD 11 — Question
Tamilnadu BoardEnglish MediumSTD 11Bio ZoologyOrgan and Organ Systems in Animals5 Marks
Question
ExplaIn the female reproductive system in cockroach.
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Answer
The female reproductive system of cockroach consists of a pair of ovaries, vagina, genital pouch, collaterial glands. spermathecae and the external genitalia. A pair of ovaries lies laterally in the $2^{\text {nd }}$ and $6^{\text {th }}$ abdominal segment. Each ovary is formed of a group of eight ovarian tubules or ovarioles, containing a chain of developing ova. The lateral oviducts of each ovary unite into a broad median common oviduct known as vagina, which opens into the genital chamber.
The vertical opening of the vagina is the female genital pore. A pair of spermathccae is present in the $6^{\text {th }}$ segment, which opens by a median aperture in the dorsal wall of the genital pouch. During copulation, the ova descend to the genital chamber, where they are fertilized by the sperms. A pair of white and branched collaterial glands present behind the ovaries forms a hard egg case called Ootheca around the eggs. Genital pouch is formed by the $7,8^{\text {th }}$ and $9^{\text {th }}$ abdominal sterna.
The genital pouch has two chambers, a genital chamber into which the vagina opens and an oothecal chamber where oothecae are formed. Three pairs of plate like chitinous structures called gonapophyses are present around the female genital aperture. These gonapophyses guide the ova into the ootheca as ovipositors.
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