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- 1 What is the role of the foot in bivalves?
- 2 What is the function of the foot in mollusks?
- 3 How have cephalopods adapted their muscular foot?
- 4 How does the foot of a bivalve differ from the foot of a cephalopod or the foot of a snail?
- 5 What is the foot used for in gastropods bivalves and cephalopods?
- 6 How is the foot and shell modified in cephalopods?
- 7 How do cephalopods use their foot?
- 8 What kind of foot do cephalopods have?
- 9 How many siphons do bivalves have?
- 10 What type of locomotion do bivalves have?
What is the role of the foot in bivalves?
As filter feeders, bivalves gather food through their gills. Some bivalves have a pointed, retractable “foot” that protrudes from the shell and digs into the surrounding sediment, effectively enabling the creature to move or burrow.
What is the function of the foot in mollusks?
Mollusks have a muscular foot used for locomotion and anchorage that varies in shape and function, depending on the type of mollusk under study. In shelled mollusks, this foot is usually the same size as the opening of the shell. The foot is a retractable as well as an extendable organ.
Where is the foot of a mollusk?
The foot is the ventral-most organ, whereas the mantle is the limiting dorsal organ. Mollusks are eucoelomate, but the coelomic cavity is restricted to a cavity around the heart in adult animals.
How have cephalopods adapted their muscular foot?
The part of the body that forms the foot in other mollusks is located anteriorly in cephalopods instead of ventrally. The rest of the foot forms a muscular funnel, or siphon, which expels water from the mantle cavity, permitting cephalopods to move about by a kind of jet propulsion.
How does the foot of a bivalve differ from the foot of a cephalopod or the foot of a snail?
The foot of the bivalve is one singular mass. Its main purpose is for burrowing or digging. The cephalopod foot is made up of tentacle and sucker like structure that are used for locomotion as well as for hunting prey. The snail foot is also one singular mass but is used mainly for crawling like movements.
How is the foot modified Among the classes of molluscs?
The foot is partly modified into muscular arms and tentacles around head for food capturing, adhesion and locomotion, and partly into a ventral siphon for jet propulsion. The cuttle fish and squids move backwards and not forwards on the basis of jet-propelled mechanism.
What is the foot used for in gastropods bivalves and cephalopods?
highly muscular organ called the foot, through which muscle fibres run in all directions. The foot of a gastropod is a flat structure used for crawling. Waves of muscular contraction travel along its length, moving the animal slowly over the ground. The foot of a bivalve mollusk is a bulbous…
How is the foot and shell modified in cephalopods?
Part of the foot area surrounds the mouth and is modified into sucker-bearing tentacles, used to capture prey. The tentacles number 8 in octopuses, 10 in squids, and as many as 90 in nautiluses. In the squid and cuttlefish the shell has become internalized and reduced, and in the octopus it is completely absent.
How do bivalves use their muscular foot to move?
bivalves. The bivalve foot, unlike that of gastropods, does not have a flat creeping sole but is bladelike (laterally compressed) and pointed for digging. The muscles mainly responsible for movement of the foot are the anterior and posterior pedal retractors. They retract the foot and effect back-and-forth movements.…
How do cephalopods use their foot?
The tentacles number 8 in octopuses, 10 in squids, and as many as 90 in nautiluses. The rest of the foot forms a muscular funnel, or siphon, which expels water from the mantle cavity, permitting cephalopods to move about by a kind of jet propulsion.
What kind of foot do cephalopods have?
The name cephalopod, in Greek, means “head foot.” This name was applied because the foot of the organism is around the head. But cephalopods lack a traditional foot, instead having between eight and ten tentacles attached to their heads.
What is the function of bivalve foot?
The bivalve foot, unlike that of gastropods, does not have a flat creeping sole but is bladelike (laterally compressed) and pointed for digging. The muscles mainly responsible for movement of the foot are the anterior and posterior pedal retractors. They retract the foot and effect back-and-forth movements.…
How many siphons do bivalves have?
Bivalves also possess two ctenida (in most cases) and a muscular foot. The edges of the mantle are fused in some taxa and prolonged to form tube-like siphons. One siphon carries water to the mantle cavity (the inhalent siphon) and one from it (the exhalent siphon); in many taxa they are fused but the water streams remain separate.
What type of locomotion do bivalves have?
In locomotion: Fossorial invertebrates …bivalves have a large muscular foot that contains longitudinal and transverse muscles as well as a hemocoel (blood cavity). The digging cycle begins with the extension of the foot by contraction of the transverse muscles.
Why do bivalves dig deeply into the ground?
mollusc and in exchange provide it with nutrients produced by photosynthesis. In the many bivalve species digging and drilling in the ground, the respiratory openings of the mantle rim are elongated to form tubes, which are then called siphons. So the bivalve, though dug deeply into the ground, is
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