A : During evolution,the early time period wa | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(B) The early atmosphere of Earth was a reducing atmosphere and lacked free oxygen,which is required for the formation of the ozone layer $(O_3)$.Ther

Vedclass · Accepted Answer

Assertion and Reason both are correct but Reason is not the correct explanation of Assertion.

Vedclass · Answer

(B) The early atmosphere of Earth was a reducing atmosphere and lacked free oxygen,which is required for the formation of the ozone layer $(O_3)$.Therefore,the early time period was indeed without an ozone layer.$UV$ rays from the sun were able to reach the Earth's surface in the absence of the ozone layer,which played a crucial role in the synthesis of organic molecules.The ozone layer,in the present atmosphere,acts as a shield by absorbing harmful $UV$ rays.Since the absence of the ozone layer in the early period is a historical fact and the property of the ozone layer to absorb $UV$ rays is a scientific fact,both are correct,but the Reason does not explain why the early period lacked an ozone layer.

$A$ : During evolution,the early time period was without an ozone layer.
$R$ : The ozone layer absorbs $U.V.$ rays to some extent.

Similar Questions

Stanley Miller had put the Oparin-Haldane theory to test in $1953$ by creating in the laboratory the probable conditions on the primitive earth. In the experiment,simple amino acids were synthesized from which of the following mixtures,as observed after eighteen days?

Which was absent in the atmosphere at the time of origin of life?

In which era was there no life?

Define and explain the terms $Abiogenesis$ and $Biogenesis$.

Who provided experimental evidence that hydrogen,methane,water,and ammonia form amino acids?

Vedclass Test Series

Exam Paper Generator

Online Exam Module

$A$ : During evolution,the early time period was without an ozone layer.$R$ : The ozone layer absorbs $U.V.$ rays to some extent.