Which are the correct statements related to ozone? (i) Ozone layer helps in increasing the UV radiations reaching earth. (ii) Ozone is a deadly poison. (iii) Ozone layer shields the earth from UV radiations. (iv) Ozone layer prevents UV rays which cause skin cancer. (v) Ozone is formed with the help of Chloroflurocarbons.
The correct option is (B). The correct statements are (ii), (iii), (iv). Ozone is poisonous but in the stratosphere, it forms a protective layer shielding Earth from harmful ultraviolet rays that cause skin cancer and damage living tissues.
Science important questions Final Exam 2025 Class 10
Science Question Paper class 10
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Ozone near the Earth’s surface is poisonous, but in the stratosphere, it forms a protective ozone layer. This layer absorbs harmful ultraviolet (UV) radiation from the Sun, preventing skin cancer, cataracts, and damage to living organisms. The correct statements are (ii), (iii), and (iv) — ozone is toxic in nature but beneficial at higher altitudes because it shields the Earth from UV rays. Hence, the ozone layer is crucial for maintaining life on Earth. The correct option is (B).