What is the habit and habitat of Obelia?
Habit and Habitat: Obelia is typically marine, colonial and sedentary. It is found attached on piles, rocks and sea weeds in shallow water. The polyp represents the asexual phase which is a prominent branched hydroid colony found attached to rocks, stones, shells of animals, wooden pilings etc.
Where does Obelia live?
Obelia is sedentary, marine colonial form found attached on the surface of sea weeds, molluscan shells, rocks and wooden piles in shallow water up to 80 metres in depth. Obelia is cosmopolitan in distribution, forming a whitish or light-brown plant-like fur in the sea; hence, the common name sea-fur is assigned to it.
What is Obelia and characteristics?
Obelia is a very tiny marine hydroid with a height of 2 cm or a little more. The obelia’s body has two kinds of filaments which are vertical hydrocaulus and horizontal hydrorhiza. Obelia’s life cycle begins as hydroid polyps. Hydroid polyps are small, immobile animals that have tentacles and stalks.
What is the function of Obelia?
OBELIA LIFE CYCLE The primary function of the medusa is sexual reproduction. Obelia is dioecious as each medusa has reproductive organs of only one sex.
What is the scientific name of Obelia?
ObeliaObelia / Scientific name
What kingdom is Obelia?
AnimalObelia / Kingdom
How colonoscopy is done?
For the procedure, you’ll lie on a table while the doctor inserts a colonoscope through your anus and into your rectum and colon. The scope inflates your large intestine with air for a better view. The camera sends a video image to a monitor, allowing the doctor to examine your large intestine.
Where are polyps?
A colon polyp is a small clump of cells that forms on the lining of the colon. Most colon polyps are harmless. But over time, some colon polyps can develop into colon cancer, which may be fatal when found in its later stages.
What is Metagenesis in obelia?
Metagenesis refers to the alternation between sexual and asexual stages. E.g. Cnidarians such as Obelia exist in both polyp and medusa forms and show metagenesis.
What is difference between jellyfish and obelia?
Obelia refers to a genus of sedentary colonial coelenterates with upright branching stems bearing minute cups in which the polyps sit while jellyfish refers to a free-swimming marine coelenterate with a gelatinous bell- or saucer-shaped body that is typically transparent and has stinging tentacles around the edge.
Is Obelia a plant or an animal?
Obelia, genus of invertebrate marine animals of the class Hydrozoa (phylum Cnidaria). The genus, widely distributed in all the oceans, is represented by many species. The animal begins life as a polyp—a tentacled, stalklike form resembling a small sea anemone attached to the ocean bottom or some other solid surface.
How does Obelia reproduce?
Through filaments, Obelia attach to various surfaces, most often the ocean floor, but sometimes seaweed, shells or wharves. Reproduction of Obelia in this life stage occurs by budding, new polyps growing and breaking away to become members of the increasingly larger colony.
What is Obelia Class 11?
Hint: Really Obelia is a classic example of alternation of generations in a hydrozoan life cycle, or so they occur suddenly. The eggs and sperm are produced by medusa. An egg develops into a fairly simple non-feeding planula larva after fertilization, which particularly is completely different.
Is Obelia an animal?
What is the habitat of Obelia?
It grows in intertidal rock pools and at the extreme low water of spring tides. Obelia is also called as Sea fur. The hydroid colony of Obelia is delicate, semitransparent and whitish to light brown in color. It consists of vertical branching stems are called as hydrocauli and the root like branches are called hydrorhiza.
What are the characteristics of Obelia?
Obelia is also called as Sea fur. The hydroid colony of Obelia is delicate, semitransparent and whitish to light brown in color. It consists of vertical branching stems are called as hydrocauli and the root like branches are called hydrorhiza. Both are of same thickness. The growth of the colony is sympodial.
What are the zooids of the Obelia colony?
The following are the three zooids of the Obelia colony, Polyp or hydranth (nutritive zooids): This nutritive zooid of the colony is also known as gastrozooids or trophozooid. It is yellow in color, radial symmetrical and cylindrical in shape. They are specialized for capture, ingestion and digestion of food.
How are hydrula and Obelia formed?
The free end forms a manubrium with a mouth and a circlet of tentacles. Thus, a simple polyp or hydrula is formed which grows a hydrorhiza from its base, from which an Obelia colony is formed by budding.