✓ Board-verified
Science · 2023 · 3 marks
CBSE 2023 · Region 5 · Set 1 · Q33
How is ozone formed in the higher levels of the atmosphere? "Damage to the ozone layer is a cause of concern." Justify this statement.
How is ozone formed in the higher levels of the atmosphere ? "Damage to the ozone layer is a cause of concern." Justify this statement.
Marking-scheme solution
UV radiations act on the oxygen molecule \(\displaystyle \left(\mathrm{O}_{2}\right)\) and then split oxygen molecule into free (nascent) oxygen.
These free oxygen atoms combine with oxygen molecule \(\displaystyle \left(\mathrm{O}_{2}\right)\) to form ozone ( \(\displaystyle \mathrm{O}_{3}\) )
Alternate answer:
\[\begin{aligned}
& \mathrm{O}_{2} \longrightarrow \mathrm{UV} \mathrm{O}+\mathrm{O} \\
& \mathrm{O}+\mathrm{O}_{2} \longrightarrow \mathrm{O}_{3}
\end{aligned}
\]
Damage to ozone layer :
UV radiations reach the Earth and cause harmful effects like skin cancer in human beings.
All Our Environment questions2023 question paperNCERT solutions: Our EnvironmentPractice Our Environment →
More from Our Environment
- Assertion (A): Ozone (O_3) gas at higher levels of atmosphere is a product of UV radiation acting on Oxygen (O_2). Reason (R): The amount of ozone in…2026
- Why are the organisms of first trophic level important in any food chain? Justify the following statement: 'The flow of energy in an ecosystem is…2025
- Assertion: Producers are capable of using light energy from the sun to make food available in an ecosystem. Reason (R): All food chains in an…2024
- Assertion: The amount of ozone in the atmosphere began to drop sharply in the 1980s. Reason (R): The oxygen atoms combine with molecular oxygen to…2025
- Other than the abiotic components, which of the given biotic components are not required to make an aquarium with small herbivorous fishes a…2025
- Use of pesticides to protect our crops affect organisms at various trophic levels especially human beings. Name the phenomenon involved and explain…2024
- Explain why food chains generally consist of three or four steps.2026
- Plants → Deer → Lion In the given food chain, what will be the impact of removing all the organisms of second trophic level on the first and third…2024
CBSE Class 10 Science past-paper question from the 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.