Answer:
Bivalve- Wedge shaped foot
Snail- Large and flat foot
Cephalopod- Foot is modified into siphon.
Explanation:
Molluscs are predominantly marine animals with a soft body,however,they are known to inhibit fresh water as well as terrestrial habitat.
They possess a *muscular foot*,which is used for *locomotion and anchorage*,they vary in shape and function depending on the type of mollusc.
MODIFICATION OF FOOT IN MOLLUSCS:
Bivalve- Foot is usually wedge shaped
Snail- Foot is large and flat
Cephalopod: Foot is modified int a siphon( a tube-like organ)
ADAPTATIONS OF FOOT IN MOLLUSCS
1)Bivalves have pointed retractable foot(wedge foot) that protrudes from the wheel and is adapted for *moving or burrowing*.
2)Snail have a mucus-laden muscular foot adaptation,that reflexes and contracts allowing movement(*crawling*) in water and terrestrial habitats
3)The foot of cephalopod is adapted for *moving* about by a kind of jet propulsion in water.
