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प्रश्न
Give four general characters of phylum Mollusca. Write down two examples.
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उत्तर
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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संबंधित प्रश्न
Explain how animals in Vertebrata are classified into further subgroups.
Match the following:
| Column I | Column II | ||
| (a) | Operculum | (i) | Ctenophora |
| (b) | Parapodia | (ii) | Mollusca |
| (c) | Scales | (iii) | Porifera |
| (d) | Comb plates | (iv) | Reptilia |
| (e) | Radula | (v) | Annelida |
| (f) | Hairs | (vi) | Cyclostomata and Chondrichthyes |
| (g) | Choanocytes | (vii) | Mammalia |
| (h) | Gill slits | (viii) | Osteichthyes |
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