Question

Give four general characters of phylum Mollusca. Write down two examples.

Answer 1

Answer:

phylum mollusca:-

i. coelom present

ii. triploblastic ,bilateral symmetry presence

iii . soft bodies sometime covered with shell

iv. generally not segmented

v. no appendages present

vi. muscular foot for movements

vii. kidney like organ for excreation.

some examples of phylum mollusca are chitin,

octopus, Unio ,pila

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Answer 2

Answer:

Characteristics of molluscs

unsegmented soft body.

most have internal or external shell.

have a mantle - a fold in the body wall that secretes the hard prtesctive shell.

muscular foot and/or tentacles.

have a radula - a toothed structure used to grate food.

two pairs of gills except in polmonate snails.

example

Clams.

Mussels.

Octopus.

Pila ( Snail)

Oyster.

Cuttlefish.

Squid.