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प्रश्न
Write down four characters of Chondrichtyes.
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उत्तर
(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.
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संबंधित प्रश्न
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 |
Write down four characteristics of Ctenophora.
Write down four main characters of Platyhelminthes.
Main characteristics of Nematoda:
What do you mean by the term triploblastic animals?
What are adaptations in fishes due to which they are aquatic?
What are differences between the following:
Cartilaginous fishes and bony fishes
What are the group names of the following categories of animals?
Animals with a backbone _____________
Write down a flow chart showing subdivisions of kingdom Animalia.
Write two main characters of the following animal and name the phylum it belongs to: Whale
Write two main characters of the following animal and name the phylum it belongs to: Jelly fish
Give two examples of each of the following: Arthropoda
Fill in the blanks:
Nephridia are the excretory organs of ______.
Fill in the blanks:
Dog fish belongs to phylum ______.
Choose the correct answer: Whittaker is famous
Choose the correct answer: Multicellular producers are
Assertion (A): Reptiles are warm-blooded animals.
Reason (R): They have scales.
Kingdom Animalia is characterized by
Assertion (A): All vertebrates are chordates but all chordates are not vertebrate.
Reason (R): The members of subphylum vertebrata possess notochord, during the embryonic period, the notochord is replaced by a cartilaginous or bony vertebral column in adults.
In the light of the above statements, choose the correct answer from the options given below:
