CBSE Class 9 Science OTBA Clean Air Shared Concern assignment

CBSE Class 9 Science OTBA Clean Air Shared Concern. Students are advised to refer to the attached assignments and practise them regularly. This will help them to identify their weak areas and will help them to score better in examination. Parents should download and give the assignments to their children for practice.

Que: Name the conditions of the atmosphere that provides excellent conditions to support and sustain life.

Ans: The atmosphere comprising of mainly Nitrogen, Oxygen, Carbon dioxide and water vapour provides excellent conditions to support and sustain life.

Que: What are pollutants?

Ans: The undesired components which contaminate air are called pollutants.

Que: Name the gas that is necessary for the survival of life on earth.

Ans: Carbon dioxide is necessary for the survival of life on earth.

Que: `Name the phenomenon that is essential to maintain and keep the earth’s atmosphere warm.

Ans: Photosynthesis

Que: What is the cause for the depletion of ozone layer?

Ans: The use of refrigerators and air conditioners, fire extinguishers, aerosol sprays like deodorants etc. results in release of CFCs and N2O in the atmosphere which is responsible for depletion of ozone layer

Que: Give the consequences of depletion of ozone layer

Ans: UV radiations enter into the atmosphere causing damage to all kinds of life on earth.

Que: What is NAns:MP?

Ans: A MP stands for National Ans:ir Quality Monitoring Programmer.

Que: What is the significance of PM10?

Ans: PM10 is the term used to describe tiny particles in the air, made up of a complex mixture of soot, organic and inorganic materials having particle size less than or equal to 10 microns diameter(10 microns is equal to one hundredth part of a millimeter)

Que: What do PTI and IST stand for?

Ans: Press Trust of India, and Indian Standard Time

Que: What is the place of Ans:ir pollution in taking lives of people in India?

Ans: Air pollution is the fifth largest killer in India taking 6.2 lakh lives per year.

Que: Name the five most critically polluted regions in the country.

Ans: Delhi, Ghaziabad, Gwalior, West Singbhum district in Jharkhand and Raipur are the five most critically polluted regions in the country.

Ques: How acid rain is is formed?

Ans: The oxides of sulphur, carbon, and nitrogen released into the atmosphere from chimneys of Industries and exhaust of vehicles react with water of the rains and oxygen from air to form acids. Dissolved acids make the rain acidic in nature.

Ques: What is the affect of acid rains on the environment?

Ans: Acid rains are very harmful for both, living and nonliving things. Ans:cid rains damage crops, pollute soil and water, ruin the harvest, damage aquatic life and erode buildings.

Que: Name the undesirable components which contaminate and cause air pollution

Ans: The harmful Ozone in the lower atmosphere, Carbon monoxide, Nitrogen dioxide, Solid or liquid matter that is suspended in the air, Sulfur dioxide, Lead,Ans:rsenic, asbestos, benzene and dioxin, Green House gasses Carbon dioxide methane and nitrous oxide are the components which cause air pollution.

Que: What is the effect of carbon monoxide on the life on earth?

Ans:

¶ It makes the body parts hard to get the necessary oxygen

¶ More exposure makes people feel dizzy and tired

¶ High concentrations is fatal

People suffering from heart disease are hospitalized more often.

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