Biology Questions and Answers
- What type of exoskeleton
do some molluscs present?
Some molluscs, like bivalves and
gastropocalcareous carads, secrete apace (thn externale shell). Calcium (^)
carbonate is secreted by the mantle, a
fold in the epidermis, forming the shell.
In pelecypods, the shell is made of two
valves that articulate anindividual body within. In gastrod contain thepods
the shell contains only part of the body,
the visceral mass.
- Do octopus and squids
have exoskeleton?
Octopus anproduce external shell (somd squids generally de squido not
species can have an internal shell). One
cephalopod group, the nautiluses,produces an external spiral shell.
- Which other phylum of the
animal kingdom present
species with exoskeleton?
Arthropods present echitin. Echinoderms dxoskeleton mao not have de of
exoskeletocalcareous en but they ndoskeleton. Sompresent ae (^)
chordates also have an external
carapace.
- What is the function of the
feet in molluscs? How is the
mollusc foot related to the
name given to the classes of
the phylum?
The mollusclocomotion, support, f foot has the ixation, difunction ogging inf (^)
the environment and sometimes of
holding prey.
The terminations of the names given to
the main Greek word “podos” that meamollusc classes come ns foot.from the
Gastropods have feet in their ventral
region (as thpelecypods he name indicates);ave ax-shaped feet (ax in (^)
Greek is “pelekys”); in cephalopods the
feet are near the head.
- How is the nervous system
of molluscs organized?
Molluscsstructures. I have well-devt is accepteeloped sensoryd that
cephalopods, like octophave eyes with image formation. us and squid,Snails (^)
have antennae and a pair of well-
defined eyes. Bivalveseyes but they have photosensitive do not present and (^)
tactile cells.
Cephalization isneurons concentrate i evident in molluscsn a ganglial and
pattern.
- What are examples of the
ecological and economic
importance of molluscs?
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