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?
View solution & NCERT explanation
Correct answer: D — All 5 statements
Statement 1: Correct → Nereis (Annelida) has parapodia that help in locomotion and respiration. Statement 2: Correct → Trygon (Chondrichthyes) has placoid scales; some rays have a poison sting. Statement 3: Correct → Fasciola (Platyhelminthes) is a parasitic flatworm using flame cells for osmoregulation and excretion. Statement 4: Correct → Asterias (Echinodermata) uses its water vascular system for locomotion and respiration. Statement 5: Correct → Pila (Mollusca) has a radula for scraping food and a calcareous shell. Thus, all 5 statements are correct .
What does NCERT say about Heart two-chambered one auricle?
Has this concept appeared in NEET?
Which chapter is this from?
Through deep analysis of NEET and NTA, 176 of the 180 ReNEET 2026 (June 21) questions were already in the MedicNEET question bank before the exam.
176/180MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.