Are cnidarians mullticellualar or unicellular?

Cnidaria, phylum of multicellular, radially symmetrical invertebrates (eg, hydroids, jellyfish, sea anemones, corals) dating to late Precambrian era (630-570 million years ago).

1. Are Cnidaria unicellular?
2. Is sea anemone unicellular or multicellular?
3. How are cnidarians classified?
4. What kind of tissue do cnidarians have?
5. Are cnidarians carnivores?
6. Are Cnidaria herbivores or carnivores?
7. Which animal is a cnidarian?
8. Are anemones jellyfish?
9. Are anemones photosynthetic?
10. Are cnidarians Colonial?
11. Are cnidarians bilateral symmetry?
12. How do cnidarians form colonies?
13. Are cnidarians Monoecious or dioecious?
14. Do cnidarians have internal or external fertilization?
15. Do cnidarians have an exoskeleton?

Are Cnidaria unicellular?

Yes. Cnidaria are multicellular, radially symmetrical invertebrates, diploblastic with nematocysts. ... Hydroids, jellyfish, sea anemones, corals are examples of Cnidaria.

Is sea anemone unicellular or multicellular?

A typical sea anemone is a single polyp attached to a hard surface by its base, but some species live in soft sediment and a few float near the surface of the water. The polyp has a columnar trunk topped by an oral disc with a ring of tentacles and a central mouth.

How are cnidarians classified?

Cnidarians are classified into four main groups: non-moving (sessile) Anthozoa (sea anemones, corals, sea pens); Cubozoa (box jellies);swimming Scyphozoa (jellyfish); and Hydrozoa, a broad group that includes all the freshwater cnidarians as well as many marine forms. ... Cnidaria have no organs like hearts or lungs.

What kind of tissue do cnidarians have?

All cnidarians have two tissue layers. The outer layer is called the epidermis, whereas the inner layer is called the gastrodermis and lines the digestive cavity. Between these two layers is a non-living, jelly-like mesoglea.

Are cnidarians carnivores?

All cnidarians are carnivores. Most use their cnidae and associated toxin to capture food, although none is known actually to pursue prey. Sessile polyps depend for food on organisms that come into contact with their tentacles.

Are Cnidaria herbivores or carnivores?

Diet and Behavior

Cnidarians are carnivores and use their tentacles to feed on plankton and other small organisms in the water.

Which animal is a cnidarian?

cnidarian, also called coelenterate, any member of the phylum Cnidaria (Coelenterata), a group made up of more than 9,000 living species. Mostly marine animals, the cnidarians include the corals, hydras, jellyfish, Portuguese men-of-war, sea anemones, sea pens, sea whips, and sea fans.

Are anemones jellyfish?

Sometimes called the 'flowers of the sea', sea anemones are actually beautiful animals, closely related to jellyfish and corals. Like jellyfish and corals, anemones belong to the group Cnidarians. The name Cnidaria comes from the Latin cnidae which means 'nettle'.

Are anemones photosynthetic?

Like corals, they host algae that convert the Sun's energy into food by a process called photosynthesis. ... Anemones can capture their own food, but the nutrients provided by the photosynthetic algae allow them to survive when there isn't much available to eat—a beneficial skill in a changing climate.

Are cnidarians Colonial?

Many cnidarian species produce colonies that are single organisms composed of medusa-like or polyp-like zooids, or both (hence they are trimorphic). Cnidarians' activities are coordinated by a decentralized nerve net and simple receptors.

Are cnidarians bilateral symmetry?

Comparative analysis provides evidence that bilateral symmetry is a primary character of Cnidaria. All anthozoan taxa are characterized by bilateral symmetry. ... The secondary radial symmetry of Cnidaria evidently is a result of the adaptation to the sessile mode of life.

How do cnidarians form colonies?

Cnidarian Colonies

Some types of cnidarians are also known to form colonies. ... One polyp is filled with air to help the colony float, while several feeding polyps hang below with tentacles. The tentacles are full of nematocysts.

Are cnidarians Monoecious or dioecious?

Depending on the species, cnidarians can be monoecious (also called hermaphroditic), with individuals capable of producing both eggs and sperm, or they can be dioecious, with individuals of separate sexes for gamete production.

Do cnidarians have internal or external fertilization?

In other cnidarians the male releases sperm into the water, but fertilization happens inside the body when sperm from a male colony enters the female and fertilizes eggs internally.

Do cnidarians have an exoskeleton?

A fundamental evolutionary feature of Cnidaria is the skeleton that may be present as an endoskeleton, exoskeleton, or hydrostatic skeleton.