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Environmental Chemistry — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryEnvironmental Chemistry1 Mark
MCQ
The ozone layer 'ozonosphere' occurs in :
  • A
    Thermosphere.
  • B
    Troposphere.
  • ✓
    Stratosphere.
  • D
    Heterosphere.
✓

Answer

Correct option: C.
Stratosphere.
An atmosphere is composed of various amount of gases which are distributed at different concentration at different heights. This lead to creation zones in the atmosphere which is also known as atmospheric layers. The ozone layer is a region of naturally occurring ozone gas present in the stratosphere. It is found in the lower portion of stratosphere present between $26-30\ \text{kms}$ above Earth. It serves as a shield from the harmful ultraviolet $B$ radiation emitted by the sun.
However, there is a main concern around the globe nowadays because of depletion of the ozone layer which allows the $\text{UV}$ radiations to reach the Earth causing major effects like skin cancer, reduction in the rate of photosynthesis.

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