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प्रश्न
Write down four characters of Chondrichtyes. Give two examples.
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उत्तर
Characteristics of chondrichthyes:
(i) They are marine fish with completely cartilaginous endoskeleton and a two-chambered heart.
(ii) They have a streamlined body which is either compressed laterally or flattened dorsoventrally. They have paired or median fins for locomotion and the tail or caudal fin is heteroceral.
(iii) Mouth is ventral in position and respiration occurs via gills.
(iv) Skin is tough and covered with minute placoid scales.
Examples: Scoliodon and Torpedo.
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संबंधित प्रश्न
What are the difficulties that you would face in classification of animals, if common fundamental features are not taken into account?
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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