Pillai Sruthi P Kumar BSc. Botany (graduate) Graduate (Visharad) in Hindustani Classical Music. Trained Bharatnatyam Classical Dancer. .A passionate speaker. A civil service aspirant. Please do rate, review and recommend if you genuinely liked my video...it will definitely make a difference in my life... Follow me through unacademy app for future notifications...
Objective This course will complete the remaining three chapters (12th ncert) part by part included in the portion of topic ENVIRONMENT' important for GS section of UPSC exam. The main objective is to explain the concepts as simply as possible, to clear the basics, especially focuses on beginners, and tries to generate an interest among viewers by being more creative. . Source 12th ncert
Target audience UPSC aspirants SSC .CDS .Railway etc.
Ozone depletion in the stratosphere Ozone is the unstable triatomic form of oxygen, O3. It is a powerful oxidant that is produced for various chemical and industrial uses. When CFCs reach the stratosphere, the ultraviolet radiation from the sun causes them to break apart and release chlorine atoms which react with ozone, starting chemical cycles of ozone destruction that deplete the ozone layer. One chlorine atom can break apart more than 100,000 ozone molecules.
Good zone -found in the upper part of the atmosphere (stratosphere). Have you heard about good zone or bad zone? Bad zone - formed in the lower atmosphere that harms plants and animals (troposphere).
It means good zone helps as a shield which absorbs ultraviolet radiation radiation from the zone. Oh...wonderful!
UV rays are highly injurious to living organisms since DNA and Proteins of living organisms preferentially absorb UV rays Its high energy breaks the chemical bonds within these molecules Dobson unit - It helps in measurement of the thickness of the ozone in a column of air from the ground to the top of the atmosphere. Ozone gas is continuously formed by the action of UV rays on molecular oxygen, and also degraded in to molecular oxygen in the stratosphere.
A balance should be maintained between production and degradation of ozone in the stratosphere. But is this balance maintained??? Now??? Of late, the balance has been disrupted due to enhancement of ozone degradation by CFC( chlorofluorocarbons)
1) CFC's find wide use as refrigerants. 2) When discharged in the lower part of the atmosphere, it moves upward and reach stratosphere. 3) In stratosphere, UV rays act on them releasing Cl atoms. 4) Cl degrades ozone releasing molecular oxygen (these atoms acting as catalysts)
1) Cl atoms are not used in the reaction. 2) Thus, whatever CFC's are added to the stratosphere, they have permanent and continuing affects on Ozone levels. 3) Ozone depletion is particularly marked on Antarctic region. 4) This results in the formation of ozone hole.
Pillai Sruthi P Kumar
Pursuing MSc (botany, Cytogenetics), Mumbai University. Youtuber#sruthipillai. Work as a Biofaculty @MtEducare (reputed institute) Mumbai