SCIENCE
ZOOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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true
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false
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Either A or B
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None of the above
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Detailed explanation-1: -In biology, cephalization refers to how the nervous system components aggregate towards one region of the body and constitute a distinct head structure. It is found in all mollusc members except for the bivalve molluscs (clams). Thus, distinct cephalization is not found in clams. Therefore, the given option is false.
Detailed explanation-2: -Clams do NOT HAVE CEPHALIZATION so there is NOT really a head or tail end. Use the figure at the below to locate the ANTERIOR and POSTERIOR ADDUCTOR MUSCLES. Use your scapel to cut through these two muscles so you can open the shell. These control the opening and closing of the shells.
Detailed explanation-3: -Clams lack cephalization because in the nervous system, there are three pairs of ganglia. A clam is a filter feeder which the food and water enter incurrent siphon, mucous secretions maintain food to gills and mouth, anus empties into excurrent siphon.
Detailed explanation-4: -Bivalves are a bit of an exception to the cephalization that characterizes most mollusks. Bivalves don’t have a head.