Which type of organism spends most of its life as a medusa?

Scyphozoa spend most of their lives in the medusa body form, and there are at least 200 species.

1. What organism is a medusa?
2. Which type of cnidarians only have the medusa form?
3. In which animal the polyp and medusa Both are found in?
4. What animals belong to hydrozoa?
5. What does the term Cnidaria mean?
6. How many cnidaria are there?
7. Is a jellyfish medusa or polyp?
8. Which of the following cnidarians has no medusa in its life cycle?
9. What are polyps and medusa in cnidaria?
10. Which of the following exists in both polyps and medusa body forms and exhibits an alternation of generation?
11. What is the phenomenon called if both body forms polyp and medusa are present in the life cycle of a species?
12. Which of the following is commonly called freshwater polyp?
13. Which class includes jellyfish?
14. What is the difference between Hydrozoa and scyphozoa?
15. Are jellyfish colonial or solitary?

What organism is a medusa?

medusa, in zoology, one of two principal body types occurring in members of the invertebrate animal phylum Cnidaria. It is the typical form of the jellyfish. The medusoid body is bell- or umbrella-shaped. Hanging downward from the centre is a stalklike structure, the manubrium, bearing the mouth at its tip.

Which type of cnidarians only have the medusa form?

Comb jellies differ from true jellyfish in two major ways—they have only a medusa stage and they have no cnidocytes. Their tentacles are covered with a sticky substance that traps plankton, the comb jelly's main prey.

In which animal the polyp and medusa Both are found in?

So, the correct answer is hydrozoa.

What animals belong to hydrozoa?

Some examples of hydrozoans are the freshwater jelly (Craspedacusta sowerbyi), freshwater polyps (Hydra), Obelia, Portuguese man o' war (Physalia physalis), chondrophores (Porpitidae), "air fern" (Sertularia argentea), and pink-hearted hydroids (Tubularia).

What does the term Cnidaria mean?

Medical Definition of Cnidaria

: a phylum of more or less radially symmetrical invertebrate animals that lack a true body cavity, possess tentacles studded with nematocysts, and include the hydroids, jellyfishes, sea anemones, and corals.

How many cnidaria are there?

cnidarian, also called coelenterate, any member of the phylum Cnidaria (Coelenterata), a group made up of more than 9,000 living species.

Is a jellyfish medusa or polyp?

Jellyfish have a stalked (polyp) phase, when they are attached to coastal reefs, and a jellyfish (medusa) phase, when they float among the plankton. The medusa is the reproductive stage; their eggs are fertilised internally and develop into free-swimming planula larvae.

Which of the following cnidarians has no medusa in its life cycle?

The class Anthozoa includes all cnidarians that exhibit a polyp body plan only; in other words, there is no medusa stage within their life cycle. Examples include sea anemones, sea pens, and corals, with an estimated number of 6,100 described species.

What are polyps and medusa in cnidaria?

There are two basic cnidarian body shapes: a polyp form, which is attached to a surface; and an upside-down free-floating form called a medusa. Some cnidarians change form at different phases of their life cycle, while others remain in one form for their entire life.

Which of the following exists in both polyps and medusa body forms and exhibits an alternation of generation?

Those cnidarians which exist in both forms exhibit alternation of generation (metagenesis), i.e., polyps produce medusae asexually and medusae form the polyps sexually.

What is the phenomenon called if both body forms polyp and medusa are present in the life cycle of a species?

Cnidarian sexual reproduction often involves a complex life cycle with both polyp and medusa stages.

Which of the following is commonly called freshwater polyp?

Hydra is a fresh water polyp of phylum coelenterata while Physalia, Obelia, Aurelia are marine coelenterates.

Which class includes jellyfish?

jellyfish, any planktonic marine member of the class Scyphozoa (phylum Cnidaria), a group of invertebrate animals composed of about 200 described species, or of the class Cubozoa (approximately 20 species).

What is the difference between Hydrozoa and scyphozoa?

Differences between a Scyphozoan & Hydrozoan medusae? Schyphozoans - More 'jelly & 4 oral arms. Hydrozoans - No oral arms. Have a velum ring & less jelly (fold up when preserved).

Are jellyfish colonial or solitary?

Jellyfish are single organisms that are free swimming and capable of moving themselves through water. Siphonophores are a colony of single celled organisms and are ocean drifters, incapable of moving through the water on their own.