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प्रश्न
What are pisces? Classify and explain two different kinds of fishes by the help of suitable examples.
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उत्तर
Pisces is a super class of subphylum Gnathostomata, which consists of following two classes:
Class 1: Chondrichthyes
(a) Marine fishes with entirely cartilaginous endoskeleton.
(b) They have a streamlined body that is either compressed laterally or flattened dorsoventrally.
(c) Mouth is ventral in position.
(d) Skin is tough and covered with minute placoid scales.
(e) Respiration occurs via gills.
Examples: Scoliodon and Torpedo
Class 2: Osteichthyes:
(a) Marine and fresh-water fish with partial or full bony endoskeleton.
(b) Their size varies from 10 mm to 4 metres.
(c) They have a spindle-shaped body.
(d) Four pairs of gills are present for respiration.
(e) They excrete ammonia (ammonotelic animals).
Examples: Labeo and Protopterus.
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संबंधित प्रश्न
Tick (✓) the appropriate answer:
Scientist who introduced binomial nomenclature is
Give four general characters of phylum Mollusca.
Write down four general characters of phylum Echinodermata.
Give an example of Urochordata.
Describe general characteristics of phylum Annelida.
Why are scientific names of living beings considered better than their common names?
What are the group names of the following categories of animals?
Animals with a backbone _____________
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.
Grasshopper-Wings, trachea, proboscis
Given below is an animal followed by three terms or features. Underline the term which does not match with the animal.
Bat - Aves, Mammalia, Chordata
Match the names of animal groups in Column I with the names of animals in column II.
|
Column I (Group) |
Column II (Animals) |
|
Annelida |
Pigeon |
|
Porifera |
Snake |
|
Mollusca |
Earthworm |
|
Reptilia |
Sponge |
|
Amphibia |
Octopus |
|
Pisces |
Trout |
|
Mammal |
Rabbit |
Which names are left out that do not match and why?
Give two examples of each of the following: Annelida
Fill in the blanks:
Ascaris is the example of phylum ______.
Fill in the blanks:
Nephridia are the excretory organs of ______.
Fill in the blanks:
Dog fish belongs to phylum ______.
Write the binomial name of
- Human being
- Paddy
Assertion (A): Reptiles are warm-blooded animals.
Reason (R): They have scales.
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:
