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What is the free floating body form of cnidarians?
Nearly all corals and some other cnidarians are attached and are called sessile .
Is a free swimming form of a cnidarian called a polyp?
no,a polyp is a coral egg.and yes coral is a living animal.
Describe the main differences between the polyp form of the cnidarians and the medusa form?
adda
What are two forms of cnidrians?
The two forms of Cnidarians are the Medusoid or mobile form (e.g. Hydra), and the Polyp or sessile form (e.g. Aurelia).
A is the tube-shaped body form with a mouth surrounded by tentecles which serves as the asexual stage in some cnidarians?
It's a "polyp" bro.
What is a sessile form of a jellyfish called?
POLYP
Is larvae considered the first form of a cnidarian?
YES. Scientists think that the first form or cnidarians was the larvae long ago. No the medusa or polyp if that is what you are thinking. Check on wikipedia if you don't believe me
What kind of environment do cnidarians live?
Cnidarians live in an aquatic habitat where they stay their whole lives. Cnidarians also have two forms in its life cycle, the polyp is the first stage. This is like a sea anemone, basically it is anchored to the ground and must wait till it matures before evolving into its medusa form, which is like a jellyfish. Some polyp's have developed the ability to move from where they are anchored though, but it is unusual. Polyp and Medusa are found in mostly all waters, the water currents in the oceans have made it possible for them to inhabit all areas in todays oceans. There are also many different types of cnidarians.
What is the mode of reproduction of medusae?
Medusa is a stage in life cycle of Cnidarians eg. Obelia in which medusae are produced by budding in blastostyl.Medusa possess sex organs i.e. testes and ovaries which produce gametes i.e. sperms and eggs which fuse to form zygote which develops in second stage of life cycle called a Polyp . Possession of two alternating stage in life cycle of Cnidarians is called Metagenesis .
What is attached body form of Cnidarian?
polyp
How do polyp and medusae in coelenterates alternate with each other?
Polyp is a asexual form which has a cylindrical body just like hydra whereas the medusa form is sexual form and has an umbrella shape. In case of Aurelia, the adult is sexual form. Males and females are separate and after copulation the female releases eggs which develop into a hydra like structure called ephyra larva which is called polyp form. This larva by budding produces umbrella shaped medusa forms. Thus the asexual polyp form alters with the sexual medusa form. This alternation of generations is called metagenesis.
What are the differences between metagenesis and metamorposis?
Metagenesis is the phenomenon by which the organism exhibits alternation of generation.For eg :cnidarians especially obelia shows metagenesis where the polyp form (sessile and cylindrical structure) produce medusae (free swimming and umbrella shaped structure) asexually and medusae produce polyp sexually. But in metamorphosis, the organism undergoes several stages which are distinct from that of the adults and these distinct structures undergo abrupt changes in their body structures and internal organs to form the matured adult one. eg: frog,butterfly.
