Question

explain phylum mollusca and give the basis of classification? Urgent!!​

Answer 1

Answer:

Phylum Mollusca is a very diverse (85,000 species ) group of mostly marine species, with a dramatic variety of form. This phylum can be segregated into seven classes: Aplacophora, Monoplacophora, Polyplacophora, Bivalvia, Gastropoda, Cephalopoda, and Scaphopoda.

Explanation:

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Answer 2

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$\red{\bold{\underline{{ Basis \: of\: Classification \: :}}}}$

• Level of symmetry / organisation
• Symmetry
• Germ layer
• Body cavity or coelom
• Body plan
• Segmentation
• Notochord
• Circulatory system
• Embryonic development
• Presence or absence of Larva stage

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$\red{\bold{\underline{{ Phylum \: Mollusca\: Explanation \: :}}}}$

Second Largest animal Phylum include both Marine and Terrestrial animals.

Bilaterally Symmetrical Triploblastic, having organ system level of organisation.

Body is Covered by Calcareous shell and unsegmented with a distinct head, muscular foot and visceral hump.

The space between the hump and the mantle is called Mantle cavity in which feather like gills are present.

The mouth container file like resting organ for feeding called radulla.

They are dioecious and oviparous with indirect developmet.

Example Pila (Apple Snail)