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Polyps and medusae are two distinct body forms of cnidarians. Polyps are typically cylindrical and sessile, with a mouth and tentacles facing upward, anchored to a substrate. In contrast, medusae are free-swimming and have an umbrella-shaped, bell-like structure, with the mouth and tentacles hanging downward. This differences in morphology reflect their adaptations to different lifestyles within their life cycle, with polyps often engaging in asexual reproduction and medusae primarily involved in sexual reproduction.
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What are the two body forms of cnidarians?
The two body forms of cnidarians are the polyp and the medusa. Polyps are typically sessile, tube-shaped organisms attached to a substrate, while medusae are free-swimming, umbrella-shaped organisms.
What do the two body forms of cnidarians look like?
Cnidarians have two main body forms: the medusa form, which is free-swimming and umbrella-shaped, and the polyp form, which is stationary and tube-shaped. Medusae have tentacles around the edge and a central mouth, while polyps have a columnar body with tentacles surrounding a central mouth.
What are two body forms in the phylum cnidarian?
The two body forms in the phylum Cnidarian are the polyp and medusa. Polyps are usually stationary, with a cylindrical body and tentacles surrounding a central mouth. Medusas are free-swimming and have a bell-shaped body with tentacles hanging down.
What body systems do cnidarians have?
The body systems that cnidarians have take two forms. The main body forms are medusa and polyp. Cnidarians do not have a transport system and the body surface is used for gaseous exchange.
What are the two body shapes of a cndarian?
polyp and medusa
What is the diffence between polyp and Medusa?
polyp---sea anenome, medusa---jellyfish Phlycabs In plain English a polyp is a cylinder with tentacles at the top. The Hydra looks like a tin can with slender arms coming from the top of its body. This body form does not move and the animals are trappers. The medusa is an umbrella shaped structure with tentacles hanging down from it. The jellyfish is an example. These animals move. During the reproductive stages of the jellyfish there is a time when they take on the polyp form. Then they bud off and become medusa. Nighthawk
Do cnidarians the polyp body type is usually sessile the Medusa body type is free-swimming?
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What is the attached body form of cnidarions?
Cnidarians, which include jellyfish, corals, and sea anemones, exhibit two primary body forms: the polyp and the medusa. The polyp is a sessile, cylindrical form that attaches to a substrate, while the medusa is a free-swimming, bell-shaped form. Both forms have a gastrovascular cavity for digestion and specialized cells called cnidocytes that contain stinging structures. The life cycle of many cnidarians involves a transition between these two forms.
What are the two phases if coelenterates?
The two phases in the life cycle of coelenterates are the polyp stage and the medusa stage. The polyp stage is characterized by a tubular body with tentacles facing upwards, while the medusa stage is characterized by a bell-shaped body with tentacles facing downwards. These two stages alternate in the life cycle of coelenterates.
What is the free floating body form of cnidarians?
The free floating body form of cnidarians is called a medusa. Medusae have a bell-shaped body with tentacles hanging down, and they are often seen swimming in the water. Examples include jellyfish and hydromedusae.
What is an example of a cnidarian in which the Medusa body plan dominant form is?
An example of a cnidarian where the medusa body plan is the dominant form is the jellyfish, specifically species like the moon jellyfish (Aurelia aurita). In these organisms, the medusa stage is the sexually reproductive phase, allowing for widespread dispersal and reproduction in the water column. The polyp stage is typically reduced and often occurs in less prominent forms, such as during early life stages.
What is the segmentation for cnidarians?
Cnidarians are segmented into two main classes: Anthozoa (sea anemones and corals) and Medusozoa (jellyfish and hydrozoans), based on their body forms. Anthozoa are generally sedentary, with a polyp body form, while Medusozoa are typically free-swimming with a medusa body form.
