Practice free Classification of Animal Kingdom (Zoology) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Which of the following characteristics is NOT found in organisms belonging to Class Chondrichthyes?
According to the NCERT text, 'Gill slits are separate and without operculum (gill cover)' in Class Chondrichthyes. Therefore, the presence of an operculum is not a characteristic of this class.
The tough skin of Chondrichthyes is characterized by the presence of:
The NCERT states, 'The skin is tough, containing minute placoid scales' for Class Chondrichthyes. Teeth are also modified placoid scales.
Why do Chondrichthyes need to swim constantly?
The NCERT text explicitly states, 'Due to the absence of air bladder, they have to swim constantly to avoid sinking.' This highlights a key adaptation of cartilaginous fish.
In Chondrichthyes, the notochord is:
The NCERT mentions, 'Notochord is persistent throughout life' in Class Chondrichthyes, differentiating them from most other vertebrates where it's largely replaced.
Which of the following represents an example of a cartilaginous fish?
Figure 4.19 illustrates 'Example of Cartilaginous fishes: (a) Scoliodon (b) Pristis'. Petromyzon is a cyclostome, Branchiostoma is a cephalochordate, and Ascidia is a urochordate.
Chondrichthyes belong to which superclass?
The NCERT states, 'Gnathostomata has two super classes, Pisces and Tetrapoda. Classes Chondrichthyes and Osteichthyes bear fins for locomotion and are grouped under Pisces.' This places Chondrichthyes under the superclass Pisces.
Teeth in Chondrichthyes are modified from:
The NCERT mentions, 'Teeth are modified placoid scales which are backwardly directed' in Class Chondrichthyes.
Which statement correctly describes the mouth position in Chondrichthyes?
The NCERT text states, 'Mouth is located ventrally' for Class Chondrichthyes.
Chondrichthyes are primarily found in which habitat?
The NCERT line 'The Chondrichthyes are fishes with cartilaginous endoskeleton and are marine' clearly indicates their habitat.
The endoskeleton of Chondrichthyes is composed of:
The class name itself (Chondrichthyes) refers to cartilage, and the NCERT states, 'They are marine animals with streamlined body and have cartilaginous endoskeleton'.
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