Question
Explain how is ozone formed? State the significance of ozone layer.
✓
Answer
- Ozone layer is located at the higher levels of the atmosphere, i.e., in stratosphere.
- Ozone is formed by the action of $UV$ (Ultra violet) radiation on oxygen ($O_2$) molecule.
- The higher energy of $UV$ radiation convert some oxygen ($O_2$) molecules into free oxygen $(O)$ atoms.
- These free oxygen atoms combine with the molecular oxygen and form a molecule of ozone ($O_3$).
- $O _2 \xrightarrow[Photodissociation]{\text { UV }} OV + O$
- Significance:
- Ozone shields the surface of the earth from ultraviolet $(UV)$ radiation from the sun.
- The ozone molecules absorb short wave-length $UV$ rays which are harmful to organisms.
- Thus, it protects life on the earth.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
→→→→→→→→→
Enlist the natural sources of acids.
An electric refrigerator rated 400 W and an electric bulb rated 100 W are operated 10 hours/day. What is the cost of the energy to operate them for 10 days at ₹ 8.00 per $k W h$ ?
→Explain gaseous exchange in plants.###Why do in plants sometimes CO2 eliminate and sometimes O2 in air?
(1) What are the changes seen in girls at the time of puberty? (2) What are the changes seen in the boys at the time of puberty? ### What are the changes seen in girls at the time of puberty?
What is called rancidity? What is the general name of chemicals which are added to fat and oil containing food to prevent the rancidity?
Describe the Tyndall effect.
Explain a double concave lens, simply called a concave lens, in brief.
State the characteristics of magnetic field lines.
Write the laws of reflection of light.