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What is metagenesis in obelia?
Metagenesis in Obelia is a reproductive strategy in which both asexual and sexual phases occur in the life cycle. It involves alternating generations of polyps (asexual stage) and medusae (sexual stage) in which both forms are capable of reproducing. This allows for genetic diversity and the production of new colonies through sexual reproduction.
Which kingdom contains organisms that have a saprophyte and gametophyte stage?
Many algae contain organisms that have a sporophyte and a gametophyte stage. This is called metagenesis of alternation of generations and is a characteristic of Cladophora.
What are coelentrates?
Cnidarians, also known as coelenterates, are a phylum of animals that includes jellyfish, corals, and sea anemones. They are characterized by possessing specialized stinging cells called cnidocytes used for capturing prey and defense. Cnidarians have radial symmetry and a simple body plan with a central mouth surrounded by tentacles.
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.
Polymorphism in coelentrates?
polymorphism in coelentrates
Are coelentrates warm or cold blooded?
cold blooded. they live in the sea.
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.
What is metagenesis in obelia?
Metagenesis in Obelia is a reproductive strategy in which both asexual and sexual phases occur in the life cycle. It involves alternating generations of polyps (asexual stage) and medusae (sexual stage) in which both forms are capable of reproducing. This allows for genetic diversity and the production of new colonies through sexual reproduction.
What is phylum coelentrates all about?
It's talking about jellyfish, coral, sea anemones 2. Coelenterates mean ''hollow Inside''
Which kingdom contains organisms that have a saprophyte and gametophyte stage?
Many algae contain organisms that have a sporophyte and a gametophyte stage. This is called metagenesis of alternation of generations and is a characteristic of Cladophora.
What is the meaning of metagenesis?
The change of form which one animal species undergoes in a series of successively produced individuals, extending from the one developed from the ovum to the final perfected individual. Hence, metagenesis involves the production of sexual individuals by nonsexual means, either directly or through intervening sexless generations. Opposed to monogenesis. See Alternate generation, under Generation., Alternation of sexual and asexual or gemmiparous generations; -- in distinction from heterogamy.
What is an alternate generation?
An alternate generation is each of the two forms of an organism whose lifestyle involves alternation of generations - also known as metagenesis - the production of sexual and asexual organisms in alternate generations.
What is cindoblast?
It is the defensive organ present in Colenterates like Jelly fishes. If you handle these coelentrates with bare hands may even lead to death. The Cnidoblasts are also called Nematocysts or stinging cells.
How are sponges and coelentrates different?
Sponges are of the phylum porifera and are assymetrical invertebrates that have no true tissues due to a lack of cell specialization. Coelenterates are any of the phylum cnidariathat have radial symmetry and are invertebrates. Coelenterates include corals, sea anemones, jellyfish, and hydroids.
What are habitat of poriferans and coelentrates?
All poriferans and coelenterates live in water, most of them in sea water, but some in fresh water. Poriferans are bottom-dwellers. Coelenterates can be free-swimming, fixed to the bottom or live in colonies fixed to the bottom, depending on species and face of life.
Is an octopus a coelenterate?
Coelenterata is an obsolete term encompassing two animal phyla, the Ctenophora (comb jellies) and the Cnidaria (coral animals, true jellies, sea anemones, sea pens, and their allies).
