Class 10 Biology Chapter 15 | Ozone Layer and How It is Getting Depleted-Our Environment 2022-23
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In this video,
โ๏ธ Class: 10th
โ๏ธ Subject: Biology
โ๏ธ Chapter: Our Environment (Chapter 15)
โ๏ธ Topic Name: Ozone Layer and How It is Getting Depleted - Our Environment | Class 10 Biology Chapter 16
โ๏ธ Topics Covered in This Video (Shipra Mam): This YouTube video provides a detailed explanation of Ozone Layer and How It is Getting Depleted - Our Environment from Class 10 Science (Biology) by Shipra Mam. Class 10th Biology Chapter 15 Ozone Layer and How It is Getting Depleted - Our Environment
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00:00 Introduction: Our Environment
00:05 Ozone Layer and How it is Getting Depleted
01:09 How do Our Activities Affects the Environment ?
06:57 Effect of Ozone Depletion
15:55 Ozone Layer
16:42 Website Overview
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Ozone gas -
Ozone is poisonous in nature.
Ozone is formed in atmosphere by the action of ultraviolet radiation on oxygen gas.
The high energy ultraviolet radiation (UV radiation) coming from the sun splits oxygen gas into free oxygen atoms.
O2 2O (Oxygen atom)
The free oxygen atoms are highly reactive. One oxygen atom reacts with an oxygen molecule to form an ozone molecule.
O2 + O O3 (Ozone molecule)
Ozone Layer:
It is a layer of the earthโs atmosphere, where ozone is concentrated.
The Ozone layer is very important for the existence of life on earth because it absorbs most of the harmful ultraviolet radiation coming from the sun and prevents them from reaching the earth.
The thinning of ozone layer is commonly called ozone depletion.
Ozone is being depleted by air pollutants.
Chlorofluorocarbons (CFCs) are air pollutants that are mainly responsible for the depletion of ozone layer in the stratosphere.
Besides, methane (CH4) and oxides of nitrogen (NO2) also cause destruction of ozone.
Effect of Ozone Depletion:
Ultra violet radiations cause skin cancer.
These cause damage to eyes and also can cause increased incidence of cataract disease in eyes.
These cause damage to immune system by lowering the bodyโs resistance to diseases.
In 1987 in an attempt to protect ozone layer, the United Nations Environment Programme (UNEP) forged an agreement among its member countries to freeze CFC production at 1986 levels.
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