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introduction about obelia
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∙ 12y ago
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What is the function of the gastrozoid of an obelia?
feeding
What is metagenesis in coelentrates?
The phenomenon in which one generation of certain plants and animals reproduces asexually, followed by a sexually reproducing generation. Also known as alternation of generations.
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.
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.
What is the function of the gastrozoid of an obelia?
feeding
Why do you need photos?
hydra obelia
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 .
Is an obelia unicellular or a muticellular organism?
multicelled
What type of symmetry is obelia?
mostly assemetric
What phylum does obelia belong to?
Phylum Cnidaria
What is the difference between hydra and obelia?
1v1 me irl
How do obelia reproduce?
they just appear magicly whooo mysterious
What is metagenesis in coelentrates?
The phenomenon in which one generation of certain plants and animals reproduces asexually, followed by a sexually reproducing generation. Also known as alternation of generations.
What Organisms which typically exhibit a polyp stage and a medusa stage belong to which class of Cnidarians?
Obelia
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.
