Question

Origin of life took place in which of the following period?

• A. Mesozoic
• B. Proterozoic
• C. Precambrian
• D. Devonian

Answer 1

The correct option is C Precambrian

Precambrian period of Archaeozoic era (3800 million years ago) is marked by origin of life. The first bacteria like chemoheterotrophic life forms were appeared during this period followed by origin of first algae like oxygenic photoautotrophs.

The Proterozoic era (2000 million years ago and spanned for 1500 million years), the era of early life, is marked by build up of oxygenic atmosphere and appearance of first eukaryotic cell.

Devonian period (395 million years ago) of Palaeozoic era is marked by origin of amphibians and diversification and dominance of fishes on earth.

Mesozoic era (from 230 million years ago to 63 million years ago) is the era of medieval life and includes three periods namely, Cretaceous (135 million years), Jurassic (180 million years) and Triassic (225 million years). It is also known as age of gymnosperms or age of reptiles.

Therefore, the correct answer is option C.