Q. Osteichthyes and Chondrichthyes are similar in which of the following features?
A) Presence of two chambered heart and ctenoid scales
B) Presence of 10 pairs of cranial nerve and absence of neck
C) Presence of opesthonephric kidneys and bony endoskeleton
D) Presence of poison stings and electric organs
Explanation
Animals belonging to class-Chondrichthyes and Osteichthyes have 10 pairs of cranial nerves and absence of neck. Chondrichthyes have a cartilaginous endoskeleton, placoid scales, opisthonephc kidneys and two-chambered heart. Class-Osteichthyes have two chambered heart, optisthonephric kidneys, ctenoid scales and a bony endoskeleton
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.