Which of the following statements are correct with reference to evolution?
(A) About 500 mya invertebrates were formed.
(B) Jawless fish evolved around 350 mya.
(C) About 400 mya sea weeds existed.
(D) About 100 mya dinosaurs suddenly disappeared.
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → (A) and (B) only
(A) About 500 mya invertebrates were formed. — Correct. NCERT gives 500 mya for invertebrates being formed and active.
(B) Jawless fish evolved around 350 mya. — Correct. NCERT gives about 350 mya.
(C) About 400 mya sea weeds existed. — Incorrect. NCERT places sea weeds and a few plants at about 320 mya.
(D) About 100 mya dinosaurs suddenly disappeared. — Incorrect. The dinosaurs disappeared about 65 mya.
NCERT Extract:
A Brief Account of Evolution – “… By the time of 500 mya, invertebrates were formed and active. Jawless fish probably evolved around 350 mya. Sea weeds and few plants existed probably around 320 mya.”
A Brief Account of Evolution – “… The land reptiles were, of course, the dinosaurs. The biggest of them, i.e., Tyrannosaurus rex was about 20 feet in height and had huge fearsome dagger like teeth. About 65 mya, the dinosaurs suddenly disappeared from the earth.”