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In which era, there was no life?
(a)Mesozoic era
(b)Palaeozoic era
(c)Cenozoic era
(d)Azoic era

Last updated date: 25th Jun 2024
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Hint: The first cellular form of life is said to have originated 2 billion years ago. Before this time period, there was no life existing on Earth. The first life forms that did appear on Earth must have been anaerobic as free oxygen was not available in the atmosphere during that time.

Complete answer:
The Azoic era is the term given for the time period when there was no life. This is because ‘A’ means no and ‘zoic’ means animal in greek. So, loosely translated it means the time when there were no living organisms. The proof for this is that in that layer of ground, no fossils are found indicating no organism existed during that time.

Additional Information: Mesozoic era: The Mesozoic era or the middle life era is the time when reptiles and conifer plants were flourishing. Thus it is also known as’ The Age of Reptiles’ or ‘The Age of Conifers’.
Paleozoic era: This era is marked by the breaking of a supercontinent. It is also the time when plants flourished and the first vertebrate animals came to land.
Cenozoic era: This era is the most recent era and starts from 66 million years ago to the present day.
So, the correct option is the ‘Azoic era’.

Note: The universe is as old as 20 billion years old. The origin of the universe is explained by using the big bang theory.
Earth which is in the solar system which in turn is a part of the milky way is said to have formed 4.5 billion years ago.
The first non-cellular life forms made out of chemicals appeared 3 billion years ago.