the lumen of the tubules. The cells of the tubules reabsorb water and certain inorganic salts. By the contraction of the tubules nitrogenous waste is pushed into the ileum, where more water is reabsorbed. It moves into the rectum and almost solid uric acid is excreted along with the faecal matter.
Marcello Malpighi – described these tubules and called them vasa varicose. Meckel later called them Malpighian tubules. Reproductive System Cockroach is dioecious 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 th and th abdominal segments. From each testis arises a thin vas deferens, which opens into the ejaculatory duct through the seminal vesicles. The ejaculatory duct is an elongated duct which opens out by the male gonopore lying ventral to the anus.
A utricular or mushroom shaped gland is a large accessory reproductive gland, which opens into the anterior part of the ejaculatory 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. XI Std Biology-Zoology Chapter- 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 nd and 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