Why is decrease of ozone in our ozone layer a cause for our worry ?
Why is decrease of ozone in our ozone layer a cause for our worry ?
Official answer
The decrease of ozone in the ozone layer is a cause for worry because ozone performs the essential function of shielding the surface of the earth from ultraviolet (UV) radiation from the Sun. This radiation is highly damaging to organisms; for instance, it is known to cause skin cancer in human beings.
Marking scheme
- 1.Mentioning that ozone shields the Earth from ultraviolet (UV) radiation. (0.5 marks)
- 2.Stating that UV radiation causes damage like skin cancer in humans. (0.5 marks)
Hint
Think about what the ozone layer protects us from and the health risks associated with that radiation.
Quick oral answer
Ozone depletion is worrying because the ozone layer filters out harmful UV rays from the sun. Without this shield, these rays can cause skin cancer and other biological damage.
Common mistakes
- 1.Confusing ozone depletion with the greenhouse effect or global warming.
- 2.Stating that ozone is a life-sustaining gas like oxygen (the text notes it is actually a deadly poison at ground level).
Analysis and explanation
According to the text, ozone () at higher levels of the atmosphere acts as a protective shield. It absorbs harmful UV radiation. If the ozone layer depletes, more UV radiation reaches the Earth's surface, leading to health hazards like skin cancer and damage to other living organisms.
Interesting facts
While ozone is a deadly poison at the ground level, it is indispensable for life when present in the stratosphere.
Question details
Q3 of 41 questions
- Board
- CBSE
- Class
- Class 10
- Subject
- Science
- Year
- 2011
- Section
- Section A
- Marks
- 1
- Type
- Very Short Answer
- Chapter
- Our Environment
- Topic
- Ozone Layer Depletion
- Bloom's level
- Understanding
- Syllabus topic
- Ozone depletion
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Frequently asked questions
How many marks does this question carry in CBSE Class 10 Science 2011?
This question carries 1 mark in the CBSE Class 10 Science 2011 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 Depletion" from CBSE Class 10 Science.
What type of question is this in the CBSE Class 10 Science 2011 paper?
This is a Very Short Answer question from Section A in the CBSE Class 10 Science 2011 paper.