Question
Give four general characters of phylum Mollusca. Write down two examples.
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Answer
- Body is soft, bilaterally symmetrical, with little segmentation and without appendages. The size of body varies from a microscopic to a giant form such as Octopus of upto 50 feet.
- Body cavity is haemocoel. True coelom is reduced and restricted to the pericardial cavity and the lumen of gonads and nephridia.
- Digestive tract has a simple structure.
- Sexes are usually separate.
Example: Octopus and Sepia.
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