Answer» Correct Answer - Option 3 : Ozone layer
The correct answer is Ozone layer. OZONE LAYER: - The ozone layer is an area or a continuous region in the stratosphere of the earth that includes high concentrations of ozone(O3) and protects the earth from the sun's harmful ultraviolet radiation.
- It has the ability to absorb the sun's harmful ultraviolet radiation, which can damage life on Earth.
- UV radiation, which is made up of various types of photons, is found in sunlight. UVA and UVB rays are the two forms of UV radiation you're probably most familiar with.
- These rays can have a variety of effects on your skin.
- The comparison between the UV A and UV B is :
| CHARACTERISTIC | UV A | UV B | | energy level | minimum | medium | | Wavelength | Longest | Medium | | Ozone layer absorption | Not absorbed by the ozone layer | absorbed by the ozone layer (almost all ) | | Skin cell effected | affecting cells deeper in the skin | Affecting cells on the top layer of the skin | | Damage to DNA | Indirect damage | Direct damage | | Source | Sunlight | Sunlight | | Penetration | More penetration than UV B | Lesser penetration than UV A |
- The ozone layer thus doesn't allow the penetration of only UV B radiations coming from the sun to the earth.
Hence, the following harmful radiations from the sun are absorbed by the ozone layer is - UV B (Ultraviolet Radiation or Rays B)
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