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प्रश्न
Write down four main characters of chordates.
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उत्तर
Main characteristics of chordates:
(i) They have a dorsal, hollow, tubular nerve cord.
(ii) Notochord is present that is ventral to the nerve cord.
(iii) They possess paired gill-slits in the pharynx.
(iv) They have a ventral heart with dorsal and ventral blood vessels and closed blood vascular system.
Examples: Salpa and Herdmania.
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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 |
Tick (✓) the appropriate answer:
Scientist who introduced binomial nomenclature is
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| Column A | Column B | ||
| 1 | Sponge | a | Amphibia |
| 2 | Snail | b | Reptilia |
| 3 | Butterfly | c | Echinodermata |
| 4 | Toad | d | Mollusca |
| 5 | Lizard | e | Arthropoda |
| 6 | Starfish | f | Porifera |
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