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AIIMS 2007
Exam
AIIMS
Year
2007
Subject
Botany
Chapter
Ecosystem

AIIMS 2007 · Botany · Ecosystem

Ozone in stratosphere extends

Ozone in stratosphere extends

Options

  1. A(10-20 \mathrm{~km})
  2. B(20-25 \mathrm{~km})
  3. C(15-30 \mathrm{~km})
  4. D(25-40 \mathrm{~km}).

Correct answer

B. (20-25 \mathrm{~km})

Step-by-step solution

Stratosphere zone of earth's atmosphere contains a layer of ozone (\left(\mathrm{O}_3\right)) which prevents the earth surface from about (99 \%) of incoming solar UV radiations. Ozone layer is present in the stratosphere which is also called ozonosphere. It lies at an altitude of (23-25 \mathrm{~km}) over equator and its concentration is 300 dobsons.
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