Question

Write down main characteristics of mollusca

Answer 1

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MOLLUSCA
coelem or cavity is present
triploblastic, bilateral symmetery
soft bodies sometimes covered with skeletons
generally not segmented
no appendages present
muscular foot for movement
shell present
kidney like organ for excretion

EXAMPLE: octopus, chiton, unio

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Answer 2

Habitat: They are mostly marine.

Body Form: The body of molluscs is un-segmented with a distinct head, muscular foot and visceral hump

Symmetry: They usually show bilateral symmetry

Shell

Mantle (Pallium

Body wall

Body cavity

Digestive tract