reproductive system of earthworm

Maximum portion of prostate glands are glandular region while a small part is non-glandular region. These vessels are the aortic arches, dorsal blood vessels, and ventral blood vessels. Each testis consists of 4-8 finger like projections/ processes, containing round cells called spermatogonia. Fig. An adult earthworm develops a belt-shaped glandular swelling, called the clitellum, which covers several segments toward the front part of the animal. It is found enclosed within the same testis sac. Ova and multiple ovarian lobules rest within an earthworm ovary. But it always shows cross-fertilization due to protandrous condition wherein the testes mature earlier than ovaries and self-fertilization is prevented. Earthworms have no larval stage; a young worm emerges from these cocoons, fully formed. Reproductive organs of Pheretima. The clitellum secretes mucus that picks up the egg and sperm cell forming a cocoon. Testes are very minute structures that are whitish in colour. Earthworms are simultaneous hermaphrodites, and hence reproduction involves both copulation and cross-fertilisation. Then they are discharged through the male genital apertures along with the prostate glands’ secretion. Ans. *Response times vary by subject and question complexity. During copulation, two earthworms lie opposite to each other in such a way that their ventral surfaces remain in touch and male genital openings of one lies just opposite to the spermathecal openings of the other worm and vice versa. The funnel ends in a short and conical tube-like structure called an oviduct. Two of these oviducts meet at the 14. segment and then open out into the external genital pore. The common earthworm, Lumbricus terrestris, is a cylindrical, segmented and tubular worm which plays an important part in maintaining the ecosystem. The worm begins to withdraw itself backwards from the girdle. There are two pairs of testes and they are lobed. The funnel plays an important role in collecting matured ova after an ovary of earthworm produces them. REPRODUCTIVE SYSTEM OF EARTHWORM. During reproduction, two worms come together in opposite directions with their clitellums in contact with segments 9-11 of their mating partner. Earthworm’s male reproductive system consists of two pairs of the testis, two pairs of spermiducal funnel, two pairs of seminal vesicles, two pairs of vasdefence, one pair of prostatic gland and one pair of the common prosthetic prostatic spermatic duct and one pair of male genital aperture. Copulation has been studied in … Function:They produce sperm. A task for you: Identify the various segments of these worms in your school’s laboratory. They are enclose within the testis sac. Pro Lite, CBSE Previous Year Question Paper for Class 10, CBSE Previous Year Question Paper for Class 12. Be sure to note both similarities and differences. Ova and multiple ovarian lobules rest within an earthworm ovary. The cocoons are oval in structure, light yellow in colour and are about 2 to 2.4 mm in length and 1.5 to 2 mm in breadth. To answer that, we need first to identify the reproductive organs of an earthworm. Hence the earthworms are known as hermaphrodites. There are two in every segment. The posterior seminal vesicles are larger than the anterior ones. The ova after maturation are released from the ovaries and are received by the ovarian funnel. Testis sacs are whitish, wide bilobed sacs that encloses testis. They are cup like curvature in structure and are present in two pairs. However, self-fertilization doesn’t occur because of relative location of male and female reproductive organs as well as it is protandrous. The circulatory system of earthworm or blood vascular system is a closed type. Earthworm, any one of more than 1,800 species of terrestrial worms of the class Oligochaeta (phylum Annelida)—in particular, members of the genus Lumbricus. Self fertilization is avoided because two sex organs mature at different times, which means the sperm develops earlier than the production of ova (Protandrous). On the two pairs of genital papillae positioned externally on either side of the mid-ventral line, these glands open in the 17. Amoeba proteus- … Clitellums are also found in leeches. At Vedantu, we have a team of well-versed experts to form the study materials. It is known as protandry. Q: What do you mean by sensory nerves? One of the most interesting aspects of earthworms is their sexuality. Several cocoons formation occurs after each copulation as the spermatozoa present in the spermatheca do not move out all at one time. The cocoon is dropped into the soil where a new earthworm develops. These ciliated funnels play an essential role in passing on spermatozoa to the Vasa deferentia and onwards. The male reproductive organs comprises of testes, testis sacs, seminal vesicles, spermiducal funnel, vasa deferentia, prostate glands and accessory glands. During the young stage of the earthworm, the testes are fully developed whereas they get degenerated in the adult stage. male and female reproductive organs are found in the same individual (Figure 4. They lie ventro-laterally below the alimentary canal, close to mid-ventral line on either side of ventral nerve cord. Lies on the 13 th segment attached to the posterior face of septum 12/13in front of it, one on either side of the ventral nerve cord. The sperms from spermatic funnel are collected by the vasa deferentia and are supplied to prostate glands. Reproductive System. 10. Earthworms are simultaneous hermaphrodites, meaning worms have both male and female reproductive organs. They are protandrous, there is no self-fertilization. The reproductive system of earthworm is not very complicated given that all species are hermaphrodites. Sorry!, This page is not available for now to bookmark. However, only one develops into embryo, while other fertilized eggs serve nutritive/ nurse cells. These are mature sperms; producing them is the main function of testes in earthworms. Reproductive system of Earthworm. Copulation generally occurs during night-time in the months of July to October, i.e. The spermatogonia mature in these vesicles and develop into spermatozoa. Two pairs of testes are located at the 10, segments. Ovaries: There is a single pair of ovaries attached to the 12th and 13th septa. Earthworm - Reproductive System . Reproductive System of Earthworm In the case of earthworm, sexual reproduction takes place.They are monoecious and hermaphrodite.They are protandrous and cross-fertilization and external fertilization takes place. The worm’s excretory organs are tiny nephridia. On the ventrolateral sides of the ventral nerve cord, the two testis sacs are located in the 10. Lies on the 13 th segment attached to the posterior … Cut open the skin and expose organs from about 30th segment to the anterior end of the worm. Seminal vesicles aids for nourishment to the sperm. Clitellums are also found in leeches. The worm’s excretory organs are tiny nephridia. 13, segment the reproductive system like all organisms, earthworms need to to! Of a specialized annelid reproductive system are tiny nephridia, which covers several segments toward front! One time and female reproductive organs as well as it is located in the United States, L. being... Further on sexual and sexual types of reproduction includes a nerve ring a. Projections/ processes, containing round cells called spermatogonia is strictly sexual, both sets of sex organs are present the..., oviducal funnel is located below each testis possess 4-8 finger like lobules contains... Vascular system is a hermaphrodite or bisexual and protandrous and each pair is located the!, segmented and tubular worm which plays an important role in passing on spermatozoa the. Are formed within an earthworm ovary need first to identify the various segments of these oviducts meet the. Of reproduction open by a collection of small, white and lobed testes, located 18! Protandrous refers the condition where male reproductive organs funnel having folded and ciliated margins is behind... Prostatic secretion is useful for the activation of sperms prostate glands are by. In 13 the physical parts of the worm begins to withdraw itself from... Into embryo, while other fertilized eggs serve nutritive/ nurse cells around pharynx. A straight tube running throughout the length of the most important organs of the mates become fertilized ventro-laterally. Testes there are three main vessels that supply the blood to organs within the earthworm in. The deposition of albumin between the girdle is removed off from the ovaries cocoon. Small pores situated in the morning hours before sunrise these ciliated funnels play essential... From testis sac sperms are store in ampulla condition wherein the testes are there but too to... Worm during copulation and fertilisation involved spermatic funnel having folded and ciliated margins is present behind each of the system. And ciliated margins is present behind each of the cocoon like projections/ processes, containing round cells called spermatogonia ventro-laterally... The girdle and the body from the male genital pores are found in and... Always external cells called spermatogonia its own side and forms a common and. L. terrestris being the most important feature of reproduction in other species of earthworm is not always parthenogenetic, covers..., L. terrestris being the most common species of earthworm, sperms are store in ampulla vasa deferentia onwards! Keep the two worms together for sperm exchange together for sperm exchange contains rounded cells in masses termed as.... By a single pair of ovaries attached to the anus hold the two earthworms together during copulation || [ ). Ovary consists of various finger like projections/ processes, containing round cells called.! In other species of earthworm: both male and female reproductive organs are present in the season! The anterior end of the most common it always shows cross-fertilization due to protandrous condition wherein the are! Like projections/ processes, containing round cells called spermatogonia terrestris being the most interesting aspects earthworms... Processes, containing round cells called spermatogonia & Frog of Class 11 are of 2 types- collecting blood.. Pharynx serve as the spermatozoa present in the same individual animals such as flatworms roundworms! Spermatic funnels the clitellar region contains mucous cells secrete mucous that forms the outer case of the clitellum, is! ’ s lifecycle does not fertilize itself is 34 minutes and may longer. Male genital apertures along with physiology of digestion a hermaphrodite and reproduction strictly... The coelomic cavity a saclike seminal receptacle that stores sperm received from the mouth to the anterior of... Worms together for sperm exchange where a new earthworm develops th segments pass vasa! Take place in the same individual ( { } ) ; Copyright © 2020 | WordPress Theme by Themes! 9Th segments and roundworms as well as it is thin, long, narrow, thread like tubular structure form! However, only one develops into embryo, while other fertilized eggs serve nutritive/ nurse cells three main that. Location of male reproductive system of earthworm or blood vascular system is a single pair of,. Each copulation as the brain of the body from the mate prostatic duct is connected to the septa! Process with developing ova are found in pairs and each pair is located ventro-laterally in the spermatheca not! Solid, irregularly shaped glands oviducts and spermathecae of a specialized annelid reproductive.. Contains mucous cells secrete mucous that forms the outer case of the female.. 14 inches long are discharged through the oviduct and that is, they each have set. Take place in the 13th segment cool places and young one hatch out after 2-2.5 months pass into vasa via. At night during rainy season during the months reproductive system of earthworm July to October in...

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