Question

What are the differences between mollusca and arthropoda? give at least 4 points. 

Answer 1

Athropoda:

1. Body is divided into head, thorax and abdomen.

2. Body is covered by chitinous exoskeletons.

3. They have jointed appendages.

4. Excretion occurs through coxal gland on malpighian tubules.

5. Respiration occurs through tracheae or book lungs, e.g. prawn, cockroach.

Mollusca:

1.Soft body divided into three distinct parts- a distinct head, visceral mass and muscular foot.

2.Body is covered by calcareous shell.

3.They have distinct foot for moving around.

4.Excretions occurs through nephridia.

5.Respiration occurs through gills

Answer 2

$\huge\textbf\green{Answer :}$


$\huge\textbf{Arthropoda :}$


→ They have organ level of organization.

→ These are animals with jointed legs. They body is various in shape. 

→ They respire through body surface, trachea and gills.

→ Body is divided into head, thorax and abdomen.

→ Ex :- Insects, crabs, spiders, prawns etc.
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$\huge\textbf{Mollusca :}$


→ They have organ system level of organization.

→ The body is soft and are shell animals. The body has a variety of shapes and is usually unsegmented.

→ They respire through gills.

→ Body is divided into head and muscular foot.

→ Ex :- Snails, oyster, cuttlefish etc.
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