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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
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 |
What is difference between bilateral symmetry and radial symmetry?
Define the term hermaphrodite. Give two examples.
What do you mean by the term coelomate animals? Give two examples.
What are adaptations in fishes due to which they are aquatic?
What are differences between the following :
(a) Cartilaginous fishes and bony fishes ;
(b) Amphibia and Reptilia ;
(c) Aves and mammals.
Explain the general characters of phylum Arthropoda. Give one example of following classes
(i) Crustacea;
(ii) Myriapoda;
(iii) Insecta;
(iv) Arachnida.
Name major phyla of Animal kingdom. Write down one character and one example of each of them.
What are the group names of the following categories of animals?
Animals with a hairy skin ___________
What are the group names of the following categories of animals?
Animals with three pairs of legs ___________
Given below is an animal followed by three terms or features. Underline the term which does not match with the animal.
Earthworm - Invertebrata, Annelida, Insecta
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
Give the name of two animals that belong to phylum echinodermata.
Give two examples of each of the following: Platyhelminthes
Fill in the blanks:
Nephridia are the excretory organs of ______.
True (or) False. If false write the correct answer.
True nucleus is seen in prokaryotic cell.
Assertion: Binomial name is the universal name and contains two names.
Reason: It was first introduced by Carolus Linnaeus
Assertion (A): Reptiles are warm-blooded animals.
Reason (R): They have scales.
