MCQ
Dinosaurs dominated the earth about:
- A10 million years ago.
- B50 million years ago.
- C180 million years ago.
- D500 million years ago.
Explanation:
The first small dinosaurs appeared during Triassic period (225 million years ago) of Mesozoic era. This makes option D incorrect as dinosaurs did not appear 500 million years ago.
Jurassic period (180 million years ago) is marked by diversification of dinosaurs; large dinosaurs dominated the earth. This makes option C correct.
The asteroid impact at the end of Cretaceous period around 60 million years ago caused mass extinction of dinosaurs thereby eliminating them. Asteroid hit increased the metal iridium concentration on earth. This makes options A and B incorrect as dinosaurs were extinct by 50 and 10 million years ago.
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
$I.$ restriction enzymes.
$II.$ Polymerase enzymes.
$III.$ Host organism ligases.
$IV.$ vectors.
$V.$ Host organisms.
select the correct option.