Question

explain mollusca
Hope for a nice answer

Answer 1

$\textbf{Hey Friend !!}$

Here is the answer of your question :-

$\huge\textbf{MOLLUSCA...}$

→ It is the Second largest Animalia kingdom.

→ They have organ system level of organization.

→ They have Bilateral Symmetry and are Triploblastic animals.

a) Bilateral Symmetry :- The body can be divided into a two similar halves by a single plane.

b) Triploblastic :- In which three layers namely endoderm, ectoderm and mesoderm are present.

→ They respire through gills.

→ Complete digestive system is present in them.

→ Circulatory system is mostly open. Blue respiratory pigment called hemocyanin.

→ They are usually unsegmented. Neoplinia is the only segmented Mollusca.

→ Foot are present in them which act as appendages.

→ The body is usually differentiated into three regions namely;

* Anterior head with sense organs.

* Dorsal visceral mass containing organ system.

* And ventral foot for movement.

→ These are soft bodies and shell animals.

→ The body has variety of shapes.

→ Ex :- Snails, Slugs, Oyster, Cuttlefish etc.
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Answer 2

Here is your answer....

MOLLUSCA:-

- These are soft bodied animals that are bilaterally symmetrical and triploblastic.

- They are mostly aquatic and few are terrestrial.

- Their soft body is covered by a exoskeleton which is made up of calcareous shell.

- Between the exoskeleton and visceral mass there is a membrane called mantle which possesses mantle cavity.

- Sexes are usually separate but few are hermaphrodite.

Example - Pila, Aplysia etc.