2. Excerpt from the Shape of Life book. So, if you are one of these people, looking at the following details should be helpful. Polyp and medusa are two life cycle stages of the Cnidaria phylum, alternating in some species, while other Cnidaria species exist as either polyp in the case of the Anthozoa class or medusa in the case of the Hydrozoa class. Advantages And Disadvantages Of Wearing School Uniform 790 Words | 4 Pages. The main disadvantage of endoscopic polyp removal is residual adenoma. Medusa are free swimming, reproduce sexually with cross-fertilization increasing genetic diversity, and present a more complex morphology than the polyp form. The evagination of the endoderm and ectoderm is followed by the proliferation of ectodermal epithelial cells at the tip of the bud, forming an internal cavity. Polyps have a tubular shape and are fixed at their base. The medusa is a free-swimming, reverse version of the polyp. Let’s start by taking a look at the advantages of revenue cycle management services. The colonoscopy has its deemed advantages and disadvantages that make the people to hesitate or use it for their treatments. Derivation of Medusa from Polyp: Striking as is the difference between polyp and a medusa, they are strictly homologous structures, and the more complex medusa is readily derived from the simpler polyp-form. Tentacles, photoreceptors, and gravity-sensing statocytes surround the bell. 3. Polyp produce either polyp or medusa by budding. Simple point wise difference between biology, physics and chemistry. Polyp are a primitive form of cnidarians being sessile, reproducing mostly asexually, and lacking sense organs. • Mesoglea is thicker in medusa than in polyp. So the pros and cons are listed below. Definition of Polymorphism 2. A polyp in zoology is one of two forms found in the phylum Cnidaria, the other being the medusa.Polyps are roughly cylindrical in shape and elongated at the axis of the vase-shaped body.In solitary polyps, the aboral end is attached to the substrate by means of a disc-like holdfast called the pedal disc, while in colonies of polyps it is connected to other polyps, either directly or indirectly. Derivation of Medusa from Polyp: Striking as is the difference between polyp and a medusa, they are strictly homologous structures, and the more complex medusa is readily derived from the simpler polyp-form. The photoreceptors and the statocytes are sense organs present only in medusa and lacking in the polyp. Body attached below so that manubrium is directly upward. The apex of the umbrella of medusa corresponds with the base of a hydranth. In addition to this elaborate means of reproduction, the polyp can form new polyps by budding. The medusa is a free-swimming, reverse version of the polyp. Asexual reproduction occurs by budding through the evagination of a circular are of tissue including the endoderm and ectoderm. They are usually an overgrowth of normal tissue, but sometimes they are true tumors (masses of new tissue separate from the supporting membrane). The risk of residual adenoma can be anywhere between 10 percent and 20 percent. Medusa is a mobile life cycle stage of the species belonging to the Cnidaria phylum. Some animals possess both … the medusae produces. Statocysts present at the bases of eight adradial tentacles. Medusa have a bell shape, with tentacles hanging down. Hydrozoa class members additionally possess a manubrium, which is a tube hanging down from the bell with the mouth at its end. Some of the advantages of this is they don't have to hunt for food since they have tentacles with nematocysts that trap the food. Medusa, however, can only reproduce sexually, giving birth to medusa only. When the reproductive buds mature, they break off and become free-swimming medusa, which are either male or female (dioecious). Advantages and disadvantages of polyp. Gastro vascular cavity represented by stomach, four radial canals and one circular canal. Gastrovascular Cavity. In Hydrozoa species, the mouth is present at the end of a tube hanging down from the bell known as the manubrium. Medusa can produce polyp as well by sexual reproduction. Fixed, rarely free, found near water mark attached to rocks. Zool. Concerned with feeding, protection and asexual reproduction. Polyp: Velum is absent. Polyp can reproduce asexually by budding, or sexually by spawning following the release of pheromones. Thank you... 10 Differences between Kwashiorkor and Marasmus (Kwashiorkor vs Marasmus), Difference between Spring wood and Autumn wood, Difference between Roasting and Calcination, Difference between Global and Local Sequence Alignment, 10 Differences between RAM and ROM in Tabular form. D The zygote grows and develops into a blastula. It represents the sexual phase. The mouth and manubrium are also homologous structures. At this stage, the polyps mouth and tentacles are facing upwards. In most cases, the development of colon cancer begins with a polyp. 4. The mouth and manubrium are also homologous structures. Medusa reproduce sexually. Corals, sea anemones, jellyfish, and hydroids are cnidarians. Polyp do not possess sense organs, while medusa possess photoreceptors and gravity-sensing stratocytes surrounding the bell. In contrast, medusa are a more evolved form of cnidarians, being mobile, reproducing sexually which promotes genetic diversity, and presenting photoreceptors and statocytes as sense organs. This means that a small or even microscopic amount of polyp (adenoma) may have not been removed and there is a risk of growth of this into a larger adenoma or even a cancer. 2. The first is the gastrozooid, which is adapted for capturing prey and feeding; the other type of polyp is the gonozooid, adapted for the asexual budding of medusa. Sense Organs. If polyps are found during a colonoscopy, they can be immediately removed and sent to the lab for biopsy. Origin 5. what are the two kinds of polyps. At a given time following the secretion of pheromones, corals release a big number of sexual cells in the water. feeding and reproductive. The primary way the medusa differs from the polyp is that the portion of the medusa that corresponds to the base of the polyp is stretched out to form an umbrella-like structure called the bell. Mouth and tentacles face towards the water. The sessile polyp form has, in fact, two types of polyps. You will be restricted to a low-fiber or clear liquid diet prior to your exam, and patients often find the bowel preparation process unpleasant. Advantages and disadvantages of Medusa. However, some of the species in the different classes are always polyps as adults such as coral reefs, some are always medusas such as jellyfish. The medusa is a flattened, more sack-like version of the polyp, floating with its mouth down and tentacles hanging below. The polyp is anchored with its mouth and tentacles facing up. The mouth is surrounded by tentacles, which are used to capture food and convey it to the mouth; these tentacles are armed with stinging cells which paralyze the prey. polyp pedunculate polyp and sessile polyp in a section of large intestine n. Main Difference Polyps and Medusae are the names of two body forms. One is in their Polyp Form, one of the stages; they can grow from their juvenile stage easily like the Porifera's do. Polyp is a sessile life cycle stage of the species belonging to the Cnidaria phylum. The polyp is cylindrical and usually fixed. Body saucer shaped, umbrella like with a reduced stalk (Jellyfish). While polyp lack the presence of sense organs, medusa have photoreceptors and gravity-sensing statocytes. In Hydrozoa class members, medusa are formed by budding. Instead of starting at age 50, they now recommend that people of average risk get their first screening at 45. More and more cases of colorectal cancer and the polyps that can cause it are being diagnosed in people younger than 50. However, even if this medical procedure is said to help patients, it is important to be aware of the advantages and the disadvantages of undergoing it first before jumping into it. B In cnidarian sexual reproduction, a male medusa releases sperm … a solitary or colonial sedentary form of a coelenterate such as a sea anemone, typically having a columnar body with the mouth uppermost surrounded by a ring of tentacles. The medusa form of Cnidarians is specifically adapted for floating and free-swimming. 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