The abdomen paragraph..ie..the 2 paragraph...I didn't understand?..pls make me understand..
Dear Student
In the paragraph that you've mentioned, the reproductive system in cockroach has been explained. The same has been described below in simple words:
Cockroaches are dioecious. Both sexes have well-developed reproductive organs
Male Reproductive System
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Consists of:
- A pair of testes; one each on the lateral side of the 4th, 5th and 6th abdominal segments
- Vas deferens arises from each testis.
- Vas deferens opens into the ejaculatory duct through the seminal vesicle.
- Ejaculatory duct opens into the male gonophores.
- A characteristic accessory reproductive gland (mushroom-shaped) is present in the 6th to 7th abdominal segments.
- The male gonapophysis represents the external genitalia.
- Sperms are stored in the seminal vesicles; glued together in bundles called spermatophores and discharged during copulation
Female Reproductive System
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Consists of:
- Two large ovaries − formed by a group of 8 ovarioles; contain chains of developing ova
- Ovary lies laterally in the 2nd to 6th abdominal segments.
- Oviducts of each ovary unite into a single median oviduct (vagina).
- Vagina opens into the genital chamber.
- A pair of spermathecae is present in the 6th segment.
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Fertilisation
- Sperms are transferred through spermatophores.
- Fertilised egg is encased in capsules called oothecae (Dark brown in colour)
- Female produces 9−10 oothecae with 14−16 eggs.
- Development is paurometabolous (means passing through nymphal stage). Nymps look like adults and grow up to 13 times by moulting.
- Regards