Characteristics of Cartilaginous Fishes — NEET Biology
📚 Practice ConceptHeart is two-chambered (one auricle and one ventricle). Some of them have electric organs (e.g., Torpedo) and some possess poison sting (e.g., Trygon). They are cold-blooded (poikilothermous) animals, i.e., they lack the capacity to regulate their body temperature. Sexes are separate. In males pelvic fins bear claspers. They have internal fertilisation and many of them are viviparous.
Consider the following statements about animals: 1. Nereis possesses parapodia for swimming and uses them in respiration. 2. Trygon (Sting ray) has placoid scales and may possess a poison sting. 3. Fasciola (Liver fluke) is an endoparasite with flame cells for excretion. 4. Asterias (Starfish) respires and moves with the help of its water vascular system. 5. Pila (Apple snail) has a radula for feeding and a calcareous shell. Which of the above statements are correct?
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