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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 |
Match the animals given under column A with their respective classification group given under column B
| 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 |
Write down four general characters of phylum Echinodermata. Give two examples.
Write down four characters of Chondrichtyes. Give two examples.
What are differences between the following :
(a) Cartilaginous fishes and bony fishes ;
(b) Amphibia and Reptilia ;
(c) Aves and mammals.
Write down four characters of mammals. Give two examples.
Give an example each of Urochordata and Cephalochordata.
Distinguish between Nonchordata and Chordata.
How do animals of Porifera differ from animals of Cnidaria?
Describe general characteristics of phylum Annelida. Give one example each class of Annelida.
What are pisces? Classify and explain two different kinds of fishes by the help of suitable examples.
Rewrite the following scientific names correctly.
ficus religiosa (peepal), zea Mays (maize) and Bombyx Mori (silk moth).
What are the group names of the following categories of animals?
Animals with a hairy skin ___________
Give any one difference between the following :
Insecta and Arachnida
TYRANNOSAURUS
(One of the extinct animals which lived on the Earth about 100,000,000 years ago) Tyrannosaurus was about six meters long and it preyed upon other animals.
What do you think about its classification-was it an amphibian, a reptile or a mammal?
Can you call it a relative of Kangaroo? Yes/No. Give reason
Choose the correct answer: Mosquito is included in insects because
Choose the correct answer: The animal of class pisces is
Write short notes on – Binomial Nomenclature.
