Which of the following characteristic features is always true for the respective group of animals?
(a) | Viviparous | All Mammals |
(b) | Possess a mouth with an upper and a lower jaw | All Chordates |
(c) | Three-chambered heart with one incompletely divided ventricle | All reptiles |
(d) | Cartilaginous endoskeleton | Chondrichthyes |
Text Solution
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• Most mammals are viviparous, but some mammals such as Platypus are oviparous. So, it's not true for all mammals.
• Chordates include jawless vertebrates (Agnatha, e.g., Petromyzon, Myxine), and nonvertebrate chordates (urochordates, cephalochordates) that do not have jaws.
• While most reptiles have a three chambered heart, crocodiles are an exception. They possess a four-chambered heart.
• Cartilaginous endoskeleton is the defining feature of Chondrichthyes (e.g., Great white sharks, sting rays). Their endoskeleton is entirely cartilaginous.
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