Question 333 marksShort AnswerSection C

How is ozone formed in the higher levels of the atmosphere? "Damage to the ozone layer is a cause of concern." Justify this statement.

Our Environment
Ozone Layer and How it is Getting Depleted

Official answer

Formation of Ozone in the Higher Atmosphere

Ozone (O3O_3) is formed at the higher levels of the atmosphere (stratosphere) as a product of high-energy ultraviolet (UV) radiation acting on molecular oxygen (O2O_2).

  1. The high-energy UV radiation splits apart some molecular oxygen (O2O_2) into free, highly reactive oxygen (O) atoms.
  2. These free oxygen atoms then combine with intact molecular oxygen to form ozone (O3O_3).

Chemical Equations:

O2→UVO+OO_2 \xrightarrow{\text{UV}} O + O

O+O2→O3O + O_2 \rightarrow O_3




Justification: Why Damage to the Ozone Layer is a Cause of Concern

Damage to the ozone layer is a major concern because:

  1. Shielding Effect: The ozone layer performs an essential function by shielding the surface of the Earth from harmful ultraviolet (UV) radiation emitted by the Sun.
  2. Health Hazards: Increased UV radiation reaching the Earth's surface is highly damaging to organisms. In human beings, exposure to UV radiation is known to cause serious health issues such as skin cancer, cataracts, and damage to the immune system.
  3. Ecological Damage: It can also harm plants, phytoplankton, and disrupt entire ecosystems.
Answer keywords:ultraviolet radiationUVO2O3free oxygen atomsskin cancershieldstratosphere

Marking scheme

  1. 1.Explanation of ozone formation with the correct chemical equation: O2→UVO+OO_2 \xrightarrow{\text{UV}} O + O (0.75 marks)
  2. 2.Correct chemical equation for the second step: O+O2→O3O + O_2 \rightarrow O_3 (0.75 marks)
  3. 3.Justification stating that ozone shields the Earth from harmful UV radiation (0.75 marks)
  4. 4.Mentioning specific damaging effects of UV radiation, such as skin cancer in humans (0.75 marks)

Hint

For the first part, write the two-step chemical equations showing how UV light splits O2O_2 and how the free O atom combines with O2O_2. For the second part, explain that ozone acts as a shield against UV rays and mention the health risks like skin cancer.

Quick oral answer

Ozone is formed when high-energy UV radiation splits oxygen molecules into free oxygen atoms, which then combine with molecular oxygen to form O3O_3. Its depletion is a concern because it allows harmful UV rays to reach Earth, causing skin cancer in humans.

Common mistakes

  1. 1.Writing the formula of ozone incorrectly as O2O_2 or 3O3O.
  2. 2.Forgetting to write 'UV' over the reaction arrow in the first step.
  3. 3.Confusing ozone depletion with global warming or greenhouse effect.

Analysis and explanation

This question is divided into two parts: the chemical mechanism of ozone formation and the ecological/health justification for protecting the ozone layer. The formation of ozone is a photochemical reaction requiring high-energy UV light to break the strong double bond of O2O_2 into free radicals, which then react with another O2O_2 molecule. The justification part tests the student's understanding of the biological consequences of ozone depletion, specifically highlighting the link between UV radiation and skin cancer as detailed in the NCERT textbook.

Interesting facts

While ozone is a life-saving shield in the upper atmosphere (stratosphere), it is a deadly poison and pollutant at ground level (troposphere) if inhaled directly.

Question details

Q33 of 39 questions

Board
CBSE
Class
Class 10
Subject
Science
Year
2023
Section
Section C
Marks
3
Type
Short Answer
Chapter
Our Environment
Topic
Ozone Layer and How it is Getting Depleted
Bloom's level
Understanding
Syllabus topic
Eco-system, Environmental problems, Ozone depletion, waste production and their solutions. Biodegradable and non-biodegradable substances.

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Frequently asked questions

How many marks does this question carry in CBSE Class 10 Science 2023?

This question carries 3 marks in the CBSE Class 10 Science 2023 examination.

Which chapter does this question come from in Science?

This question is from the chapter "Our Environment" in the CBSE Class 10 Science syllabus.

What topic does this question cover in Science?

This question covers the topic "Ozone Layer and How it is Getting Depleted" from CBSE Class 10 Science.

What type of question is this in the CBSE Class 10 Science 2023 paper?

This is a Short Answer question from Section C in the CBSE Class 10 Science 2023 paper.