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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'.
Which of the following features contributes to the predatory nature of Chondrichthyes?
The NCERT text describes, 'Their jaws are very powerful. These animals are predaceous.' While a streamlined body helps in movement, powerful jaws are directly linked to their predatory lifestyle.
Chondrichthyes are grouped under 'Pisces' along with Osteichthyes because they both:
The NCERT states, 'Classes Chondrichthyes and Osteichthyes bear fins for locomotion and are grouped under Pisces.' This is the common feature for their grouping.
Which of the following layers is common to both dicotyledonous and monocotyledonous roots?
The anatomy of the monocot root is similar to the dicot root in many respects. It has epidermis, cortex, endodermis, pericycle, vascular bundles and pith.
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