Describe the Life Cycle of Obelia

Alternation of Generations and Metagenesis of Obelia. What adaptive advantage is served by the motile medusa stage.

Life Cycle Of Obelia With Diagram Phylum Cnidaria

Obelia Definition of Obelia.

. O other polyps specialized for reproduction lack tentacles and produce tiny medusae by asexual budding. In the polyp form mouth is. By repeated budding of the hydrula.

But the medusae buds some of the zooids of the colony develop gonads and from their fertilized egg new Obelia colony arises. Name three advances that flatworms have over cnidarians. Uski life cycle ko kis name s Bulaya jata Most appropriate term for life cycle of obelia isaAlternation of generationbMetagenesiscMetamorphosisdNeotenyCorrect answer is option B.

The hydrocaulus gives rise to a number of gastrozooids and as. The life cycle of Obelia is termed as Metagenesis which also means alternation of generations. NIFT UG PG Previous Papers Online.

Explain the symbiotic relationship found in corals. All the individuals in a colony are attached through branches to a horizontal hydrorhiza. Name three advances that flatworms have over cnidarians.

The primary function of the medusa is sexual reproduction. Most appropriate term to describe the life cycle of Obelia is metagenesis. NCHMCT JEE Previous Papers Online.

AP Police and SI Exam Tests. Benthic polyps asexually produce free-swimming ephyrae which develop into the medusae and medusae produce sperms and eggs that fertilize to form planula larvae which develop into polyps 28. The Obelia colony is sexless bears no gonads and develops by asexual process ie.

Bihar Police Exam Tests. Development and Life History of Aurelia Fig. The polyp colony.

On mature colonies there are individual hydranths called gastrozooids which can be found expanded or contracted to aid in the growth of this organism by feeding. V Figure 338 The life cycle of the hydrozoan Obelia. Because in this particular term puchi gyi mtlb.

A fixed polypoid phase hydroid colony and a pelagic medusoid phase. Explain the symiotic relationship found corals. What do you understand by Alternation of Generations Explain it with reference to the life-cycle of Obelia.

These two stages alternate one producing the other. Polyp is an asexual form and reproduces by asexual means while medusa is a sexual zooid and reproduces sexually. The life history may be represented as male and female gametes zygote planula larva hydrula colony sexual medusae gametes zygote and so on.

Describe the life cycle of Obelia. Driving Tests India Mass Communication and Journalism. The zygote divides regularly and a blastula is formed.

Metagenesis is a special type of polymorphism in which the sexual zooids become separated from the parental colony. The polyp is asexual and the medusa is sexual releasing eggs and sperm. A distinct alternation of generations or metagenesis is present in the life history of Obelia.

Motile medusa and sessile polyp. During their life cycle polyps reproduce asexually by budding and medusa reproduces sexually by produce gametes through meiosis. By invagination of the blastula an oval two-layered ciliated planula larva is formed blastopore of which is not closed.

Obelia is dioecious as each medusa has reproductive organs of only one sex. There is no difference between the male and female medusae. It is the slide of obelia which is a marine colonial and arborescent animal.

Obelia refers to the sedentary marine colonial form which has an attachment on the surface of. In Obeia life-cycle includes two clearly defined phases. Explain how the development of bilateral symmetry allows for cephalization.

अथव ओबलय क जवन-चकर क उललख कजए Describe the life cycle of Obelia. Hello friends my name is ashish giri and my Instagram account name giria4523My Telegram channel name Bio Book tagDownload free application for notes. The life cycle of Obelia has two stages.

During this stage of life Obelia are confined to substrate surfaces. What adaptive advantage is served by the motile medusa stage. Explain how the development of bilateral symmetry allows for cephalization.

Recognize Hydra and Obelia as a Cnidarians. NTSE Previous Papers Online. Explain the symiotic relationship found corals.

Describe the life cycle of Obelia. The first form is diploblastic. The reproductive polyp gonozooids have medusa buds.

The free swimming planula stage in the life history of Obelia helps in the dispersal of the species. Describe the life cycle of Obelia. It is found attached to submerged objects like rocks and weeds etc.

Life cycle The polyp colony reproduces asexually. This is so because there is an alternation between the polypoid and the medusoid generation. Hydroid colony has no gonads and reproduces by asexual budding to give rise to medusae.

O Medusae swim off grow and reproduce sexually. OBELIA LIFE CYCLE. REPRODUCTION IN OBELIA The life cycle of Obelia includes both polyp and medusa stages.

Obelia has a simple nerve net with no brain or ganglia. What adaptive advantage is served by the motile medusa stage. Describe the life cycle of Obelia in terms of where sexual and asexual reproduction occur.

Alternates between a sedentary polyp form and a free-swimming medusal form. Both polyp and medusa forms are diploid whereas their gametes are haploid. Most corals have a symbiotic relationship with green algae and other photosynthetic protists that live within the coral tissues.

On the other hand medusae reproduce exclusively by sexual method ova and sperms to give rise to new hydroid colonies. A Asexual Reproduction The polyps reproduce asexually by the process of budding. It is a life cycle alternating between a generation reproducing sexually and another reproducing asexually the two often differing morphologically.

The typical life cycle of Aureliacomprises the following transitions. Life Cycle of Obelia. Postal Exams Model Papers.

Metagenesis is evident in the life. So the correct answer is Metagenesis. Obelia throughout its life cycle takes two forms.

Alternating polyp and medusa phases. The branches are called hydrocauli. The gonads testis or ovaries are four in number and lie on the sub-umbrella below the radial canals in the form of knobs.

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