Homework Answers
Answer :- molluscs :- all molluscs are bilaterally equal except gastropods.
Torsion in gastropod :-
Torsion is a rotation of visceral mass and foot 180 degrees with respect to head and foot.
Head and foot do not take part in torsion and remained fixed.
Evolutionary reasons:-
Visceral growth in gastropods causes it to lean more to right side than left side as a result unequal growth of the body occurs.which results in unbalanced shell.
Therefore in order to prevent falling due to unbalanced shell gastropods have evolved torsion as a special mechanism by which it brings back the center of gravity to the middle of body.
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