Fish, amphibians, reptiles and mammals are placed in the same phylum, Chordata, due to common features like:
I) Presence of notochord
II) Presence of dorsal, hollow neural system
III)Presence of dorsal, solid neural system
The correct statements are:

see full answer

Talk to JEE/NEET 2025 Toppers - Learn What Actually Works!

Real Strategies. Real People. Real Success Stories - Just 1 call away

An Intiative by Sri Chaitanya

(I) and (II)

(I) and (III)

Only (I)

Only (III)

answer is C.

(Unlock A.I Detailed Solution for FREE)

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test

Detailed Solution

Fishes, amphibians, reptiles, and mammals are all classified within the phylum Chordata due to common features that include:

Presence of notochord: The notochord is a flexible, rod-like structure that provides support to the body and is found in the early stages of development in all chordates.
Presence of dorsal, hollow neural system: Chordates have a dorsal, hollow nerve cord that runs along their back. This nerve cord eventually develops into the spinal cord in vertebrates (such as fish, amphibians, reptiles, and mammals).

Watch 3-min video & get full concept clarity