Question 1 ) Write some characteristics of sponges.
Question 2 ) Explain how the systems of cnidarians work.
Question 3 ) a) What are Bivalves? b) What are cephalopods? c) What are Gastropods?
Question 4 ) Explain about echinoderms. Write characteristics and examples.
Question 5) What are the three types of Arthropods?
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1.Sponges are similar to other animals in that they are multicellular, heterotrophic, lack cell walls and produce sperm cells. Unlike other animals, they lack true tissues and organs, and have no body symmetry.
2.Cnidaria have no organs like hearts or lungs. They have an internal cavity used for respiration and a gastrovascular cavity (a "stomach") with a mouth but they do not have an anus. They possess a body wall made from two layers (the ectoderm and the endoderm) separated by a jelly-like layer called the mesoglea.
3.Bivalves is an aquatic mollusc which has a compressed body enclosed within a hinged shell, such as oysters, mussels, and scallops.
Any of the class of sea animals that have a large soft head, large eyes and eight or ten long thin legs (tentacles), Octopus and squid are cephalopods.
The gastropods, more commonly known as snails and slugs, belong to a large taxonomic class of invertebrates within the phylum Mollusca, called Gastropoda. This class comprises snails and slugs from saltwater, from freshwater, and from the land.
4.Echinoderm is the common name given to any member of the phylum Echinodermata of marine animals. The adults are recognizable by their radial symmetry, and include such well-known animals as sea stars, sea urchins, sand dollars, and sea cucumbers, as well as the sea lilies or "stone lilies".
5.A large majority of arthropods belong to the three main groups:
Insects
Arachnids
Crustaceans.
2.Cnidaria have no organs like hearts or lungs. They have an internal cavity used for respiration and a gastrovascular cavity (a "stomach") with a mouth but they do not have an anus. They possess a body wall made from two layers (the ectoderm and the endoderm) separated by a jelly-like layer called the mesoglea.
3.Bivalves is an aquatic mollusc which has a compressed body enclosed within a hinged shell, such as oysters, mussels, and scallops.
Any of the class of sea animals that have a large soft head, large eyes and eight or ten long thin legs (tentacles), Octopus and squid are cephalopods.
The gastropods, more commonly known as snails and slugs, belong to a large taxonomic class of invertebrates within the phylum Mollusca, called Gastropoda. This class comprises snails and slugs from saltwater, from freshwater, and from the land.
4.Echinoderm is the common name given to any member of the phylum Echinodermata of marine animals. The adults are recognizable by their radial symmetry, and include such well-known animals as sea stars, sea urchins, sand dollars, and sea cucumbers, as well as the sea lilies or "stone lilies".
5.A large majority of arthropods belong to the three main groups:
Insects
Arachnids
Crustaceans.
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