1. How would one distinguish between a bivalve and a brachiopod? A) Bivalves inc
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1. How would one distinguish between a bivalve and a brachiopod? A) Bivalves include marine species, brachiopods do not. 8) Brachiopods have a lophophore, bivalves do not. C) Bivalves have two opposing shell-halves, brachiopods do not D) All the above are correct 2. Which structure secretes the shell in the Mollusca? A. Mantle B. Gills C. Foot D. Crystalline style 3. What do all the phyla within the Cycloneuralia have in common? A. They all have circular brains around their pharynx. B. They all have jaws in their pharynxes. C. They all have a rhynchocoel. D. They all have a corona 4. What does the name 'Arthropoda' refers to? A. Jointed legs B. Hardened shell. C. Many legs. D. Old animals E. None of the above.Explanation / Answer
1. D) Bivalves belong to the invertebrate phylum Mollusca, which also includes snails, squids, and octopuses. All bivalves are aquatic, encompassing both marine and fresh-water species.Brachiopods have a lophophore, a crown of tentacles whose cilia ( fine hairs) create a water current. Bachiopods are made up of two valves which are different sizes and possibly shape, whereas the two valves on a bivalve are the same (symmetrical).
2. a) Mantle is responsible for secreting shell in molluscs. It is the dorsal body wall covering the organs of digestion, reproduction and movement. The epidermis of mantle secrets calcium carbonate and conchiolin that is responsible for shell formation.
3.a) The group has also been considered a single phylum, sometimes given the old name Nemathelminthes. The name derives from the position of the brain around the pharynx.
4. a)Arthropod means organisms with jointed appendages where arthro means jointed and pods means legs.
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