Advertisements
Advertisements
प्रश्न
What are pisces? Classify and explain two different kinds of fishes by the help of suitable examples.
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
Tick (✓) the appropriate answer:
Scientist who introduced binomial nomenclature is
What do you mean by the term triploblastic animals? Give two example.
Name the phylum in which ambulacral system is present. What is its function?
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.
Write short note on protochordates.
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 _____________
Give any one difference between the following :
Insecta and Arachnida
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
Name three animals (belonging to different classes) which breathe by means of lungs but have no external ears (pinnae).
Write two main characters of the following animal and name the phylum it belongs to: Jelly fish
Name any two animals which possess compound eyes.
Write name of any poikilothermic animal.
Fill in the blanks:
Bath sponge belongs to phylum ______.
______ in 1623, introduced the binomial nomenclature.
Write short notes on – Binomial Nomenclature.
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:
