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Give Four General Characters of Phylum Mollusca. Write Down Two Examples. - Science

Short Note

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

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General characteristics of phylum Mollusca:
(i) They have a soft, bilaterally symmetrical body with little segmentation and without appendages. Body cavity is haemocoel.
(ii) Body is divisible into an anterior head, a ventral foot and a dorsal visceral mass. The entire body is covered by a thin fold of skin called mantle, which secretes a hard calcareous shell of one or more pieces.
(iii) Respiration occurs via gills, mantle or a "lung" of the mantle.
(iv) Sexes are usually separate.
Examples: Chiton and Pila.

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P S Verma and V K Agarwal Class 9 Biology - Science Part 3
Chapter 4 Diversity in Living Organisms
Short Questions Answer ( Carrying 2 Marks) | Q 36 | Page 260
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