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BIOSPHERE-8th Standard Social Science Notes

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BIOSPHERE

I Answer the following questions:

1.What is Biosphere?

Ans: Biosphere is a part of the earth where life exists. It is the fourth component of the earth and it is the totality of all living things on earth.

2.Define ecology?

Ans: Ecology is the study of the interaction of living organisms with their physical, chemical and biological environment.

3. Name the different types of environmental pollution.

Ans: The different types of environmental pollution are-

(1) Air pollution, (2) Water pollution,

(3) Soil pollution and (4) Noise pollution.

4.What are the measures to control water pollution?

Ans: Some measures to control water pollution are-

(a) Industrial effluents must be treated,

(b) Drinking water sources must be kept clean,

(c) Sewage treatment plants,

(d) Disposal of waste on the water bodies must be controlled, etc.

5.What is Bio-diversity?

Ans: The variety of flora (plants) and fauna (animals) in a region is known as biodiversity.

II. Define the following:

1. Biosphere: Biosphere is a part of the earth where life exists. It is the fourth component of the earth and it is the totality of all living things on earth.

2. Ecological imbalance: In a natural environment, there is a perfect balance between the various organisms living together in the biosphere. This is known as ecological balance. When this balance is disturbed due to various reasons, it leads to ecological imbalance.

3. Global warming: The temperature of the earth is increasing slowly over the years. For the last few years global temperature has increased. This phenomenon is termed as Global warming.

4. Greenhouse effect: The energy that the earth receives from the sun has to be balanced by the radiation emitted from the earth's surface. The use of fossil fuel is increasing green house gases in the atmosphere. Carbon dioxide and other greenhouse gases trap the heat radiated from the earth. Thus increasing of greenhouse gases is causing an increase of temperature. This is called 'Greenhouse effect’

5. Ozone depletion: In recent years the use of air conditions, refrigerators, sprays and deodorants are destroying the ozone due to the synthetic chemicals released into the atmosphere, primarily 'chlorofluorocarbons'(CFC). The ozone depletion has caused the ozone hole.

6. Acid rain: Acid rain contains high amounts of acids particularly sulphuric acid and carbon monoxide. It is caused when the rain drops pass through the polluted atmosphere. The rainfall with poisonous acids kills marine organisms. Acid rain is damaging forests, agricultural crops, old buildings, monuments, etc.

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1 Response to "BIOSPHERE-8th Standard Social Science Notes"

Unknown said...

Very good notes same as like text book thank u

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