Question

1. Describe the general organization, feeding mode and life cycle of cnidaria. Be sure to include the following terms:  hydrostatic skeleton, cnidocyte, nematocyst, medusa, polyp, jet propulsion, gastrovascular cavity, reef, zooxanthellae. What are the names of the major groups within these phylum  cnidaria?

Answer 1

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EXPLANATION :

Phylum Cnidaria

Cnidarians are diploblastic, have organized tissue, undergo extracellular digestion, and use cnidocytes for protection and to capture prey.

cnidaria feed

Cnidarians are carnivores, and some can also consume plant matter. They catch their food using their nematocysts or through filterfeeding. Cnidarians digest their food using a primitive digestive system that contains no organs--they have a mouth (which also serves as the anus) and a gastrovascular cavity.

• Life cycleIn the Cnidaria, the water-filled gastrovascular cavity acts as ahydrostatic skeleton. A hydrostaticskeleton is composed of water or body fluids in a cavity of the body. ... Some epitheliomuscular cells of the body wall are contractile. They help in movement.
• Cnidarians contain specialized cells known as cnidocytes (“stinging cells”), which contain organelles callednematocysts (stingers). These cells are present around the mouth and tentacles, serving to immobilize prey with toxins contained within the cells.
• Polyp is a sessile life cycle stage of the Cnidaria phylum. Medusa is a mobile life cycle stage of the Cnidariaphylum, contracting with it muscular bell. Polyp have a tubular shape and are fixed at their base, with the mouth present at the other end of the tube facing the water.
• The only organ in a Cnidarians' body is a stomach used for digesting food. Three types of Cnidarians are sea anomie, corals, and sea jellies. ... Sea Jellies, also known as jellyfish, have muscles that serve as a jet propulsionsystem. Jet Propulsion is a forming of swimming that acts like a jet.
• The gastrovascular cavity is the primary organ of digestion and circulation in their the Cnidaria
• When these limestone formations increase, they are called a coral reef
• The dinoflagellate algae that is found in cnidarians, is from the genus Symbiodinium. This is the genus that is also known as "zooxanthellae
• Cnidarians are classified into fourmain groups: the almost wholly sessile Anthozoa (sea anemones, corals, sea pens); swimming Scyphozoa (jellyfish); Cubozoa (box jellies); and Hydrozoa (a diverse group that includes all the freshwater cnidarians as well as many marine forms, and has both sessile members, such as Hydra

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