The Female roundworm is larger in size than the male. The female reproductive system consists of two ovaries, two uteri and one vagina. These organs, are situated in the posterior half of the body of the worm. The ovaries are coiled and narrow. Eggs are produced at the posterior part of the ovary.
The oviducts are connected with the ovary. The eggs produced in the ovaries pass to these ducts. A part of the oviduct enlarges to form a seminal receptacle. Here the sperms are stored. The oviduct meets the uterus. The two uteri uniting together form the tubular vagina. The vagina opens outside through the female genital aperture.
Fig: Female Reproductive System of roundworm
Reproductive System: The roundworm is a unisexual animal. Generally, the male worm is smaller in size than the female and the posterior part of its body is bent.
Excretory System: Excretion is the process of discharging unwanted nitrogenous waste materials from the body. The structure of the excretory system of roundworm is very simple. The system consists of two-long tubes at the two sides of the body against the lateral lines. Meeting together at the other end, the two tubes open outside through the excretory pore or cloacal aperture.