Chordate Classification & Evolution — NEET Biology
📚 Practice ConceptPhylum Chordata includes animals which possess a notochord either throughout or during early embryonic life. Other common features observed in the chordates are the dorsal, hollow nerve cord and paired pharyngeal gill slits. Some of the vertebrates do not possess jaws (Agnatha) whereas most of them possess jaws (Gnathostomata). Agnatha is represented by the class, Cyclostomata. They are the most primitive living chordates and are ectoparasites on some fishes. The jawed fishes have two main classes: Pisces and Tetrapods. Classes Chondrichthyes and Osteichthyes bear fins for locomotion and are grouped under Pisces. The Chondrichthyes are fishes with cartilaginous endoskeleton and are marine. Classes, Amphibia, Reptilia, Aves and Mammalia have two pairs of limbs and are thus grouped under Tetrapods. The amphibians have adapted to live both on land and water. Reptiles are characterised by the presence
Assertion (A): All chordates have post-anal tail. Reason (R): Presence of a notochord and dorsal nerve cord are also chordate features.
View solution & NCERT explanation
Correct answer: B — Both A and R are true, but R is not the correct explanation of A
R is true but does not explain A directly. Post-anal tail is an independent chordate feature.
What does NCERT say about Phylum Chordata includes animals?
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.