What are the two cnidarian body plans?
Two distinct body plans are found in Cnidarians: the polyp or tuliplike “stalk” form and the medusa or “bell” form. ((Figure)). An example of the polyp form is found in the genus Hydra, whereas the most typical form of medusa is found in the group called the “sea jellies” (jellyfish).
What are the two body forms in cnidarians describe them?
There are two basic cnidarian body shapes: a polyp form, which is attached to a surface; and an upside-down free-floating form called a medusa. Some cnidarians change form at different phases of their life cycle, while others remain in one form for their entire life.
What is the cnidarians body plan called?
There are two basic body plans in cnidarians. They are called the polyp and medusa. Both are shown in Figure below.
What are the two forms of cnidarian How are they similar different?
The two body forms of Cnidarian are the medusa and the polyp. Cnidarians are invertebrates such as jellyfish and corals. All cnidarians are aquatic species and most of them are found living in the ocean. There are more than 10,000 cnidarian species.
What are the two chief morphological body forms of cnidarians What are the chief functions?
The anatomy of cnidarians depends on two different body types called the polyp (polypoid), which is regularly sessile, and the medusa (medusoid), which is ordinarily free-gliding. The cnidarian life cycle includes a alternation of generations, where in the life forms can switch between the polyp and medusa structures.
What is a polyp cnidarian?
What is Polyp? Polyp is a sessile life cycle stage of the species belonging to the Cnidaria phylum. Adult corals and sea anemones are examples of polyps. A polyp is formed by a tube with a mouth surrounded with tentacles, referred to as a “head”, and is attached to the bottom with a foot-like disk.
What are the two forms of cnidarians How are they similar different?
What are the difference between polyp and medusa form?
Polyps have a tubular shape and are fastened at their base, with the mouth facing the water at the other end of the tube. Medusa has a bell-shaped body with hanging tentacles. Polyp does not have a manubrium. The Hydrozoa class’s Medusa has a manubrium, a tube that hangs from the bell.
Whats the difference between polyp and medusa form of cnidarians?
Medusa is a mobile life cycle stage of the Cnidaria phylum, contracting with it muscular bell. Polyp have a tubular shape and are fixed at their base, with the mouth present at the other end of the tube facing the water. Medusa have a bell shape, with tentacles hanging down. Polyp do not have a manubrium.
What is polyp in Cnidaria?
polyp, in zoology, one of two principal body forms occurring in members of the animal phylum Cnidaria. The polyp may be solitary, as in the sea anemone, or colonial, as in coral, and is sessile (attached to a surface).
What are the polyp and medusa?
The polyp is a sessile, or nonmotile, organism; well-known solitary polyps are the sea anemone and the freshwater hydra. The medusa, when free swimming, is popularly known as a jellyfish.
What are the difference between polyps and medusa?
Polyps have a tubular shape and are fixed at their base. Their mouth is present at the other end of the tube, and is surrounded with tentacles forming the “head”. Mouth and tentacles face the water. In contrast, medusa have the shape of a contracting muscular bell enabling it to swim.
What is the difference between two body forms polyp and medusa exhibited by cnidarians?
Most of the Cnidarian classes utilise polyp and medusa as two stages of their life cycle. Polyps are sessile and asexually reproduce by budding. But, medusa reproduces sexually by producing sperms and eggs. The key difference between polyp and medusa is that polyp is sessile whereas medusa is free-swimming.