Consider the following state- ments : 1. Ozone is mostly found in the stratosphere. 2. Ozone layer lies 55-75 km above the surface of the Earth. 3. Ozone absorbs ultraviolet radiation from the Sun. 4. Ozone layer has no significance for life on the Earth.

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Q: 82 (CDS-I/2012)
Consider the following state- ments :
1. Ozone is mostly found in the stratosphere.
2. Ozone layer lies 55-75 km above the surface of the Earth.
3. Ozone absorbs ultraviolet radiation from the Sun.
4. Ozone layer has no significance for life on the Earth.
Which of the statements given above are correct ?

question_subject: 

Geography

question_exam: 

CDS-I

stats: 

0,79,20,9,79,8,3

keywords: 

{'ozone layer': [6, 0, 0, 6], 'ozone': [3, 0, 3, 5], 'stratosphere': [1, 0, 1, 0], 'ultraviolet radiation': [1, 0, 1, 0], 'sun': [3, 0, 0, 6], 'earth': [0, 1, 1, 1]}

The correct answer is option-2: 1 and 3.

Explanation:

Statement 1: Ozone is mostly found in the stratosphere. This statement is correct. The stratosphere is the second layer of the Earth`s atmosphere, and it is where most of the ozone is present. Ozone is formed when oxygen molecules interact with ultraviolet radiation from the Sun.

Statement 2: Ozone layer lies 55-75 km above the surface of the Earth. This statement is not mentioned in the question, so we cannot determine its correctness.

Statement 3: Ozone absorbs ultraviolet radiation from the Sun. This statement is correct. The ozone layer acts as a shield for the Earth, absorbing most of the harmful ultraviolet (UV) radiation from the Sun. This absorption helps to protect life on Earth from the harmful effects of UV radiation.

Statement 4: Ozone layer has no significance for life on the Earth. This statement is incorrect. The ozone layer is of great significance for life on Earth. As mentioned earlier, it protects us from harmful UV radiation, which can cause skin cancer, cataracts, and other health issues.

Overall, statements 1 and 3 are correct, so the correct answer is option-2.