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

Earth is believed to have been formed in the solar system of the galaxy named $P$ about $Q$ years ago.
$\quad\quad\quad P \quad\quad Q$

Which Russian scientist proposed the theory for the origin of life?

The Russian scientist who proposed the theory of the origin of life was

Stanley Miller observed the synthesis of ........ during his experiment.

In their experiment,Urey and Miller mixed $CH_4, H_2, NH_3$,and water vapor in a closed flask and provided electrical energy at a temperature of ........ to simulate primitive atmospheric conditions. (in $^{\circ} C$)

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.