Pollution Caused by Man
Pollution Caused by Man
1. Automobiles: The numbers of vehicles are increasing rapidly in our cities. The exhaust emission from vehicles contain poisonous substances like sulphur dioxide, carbon monoxide, lead, nitrogen oxides, particulate matter and smoke which cause air pollution on entering in the environment.
2. Domestic activities: When wood, cow dung cakes, coal and kerosene are burnt to cook food, these generate thick smoke which pollute the air. This smoke contains sulphur dioxide, carbon monoxide and unburnt carbon compounds.
3. Industries: Many of the industries like chemical plants, steel, fertilizers, sugar and cement manufacturing units emit large amount of smoke and pollutants like oxides of sulphur and nitrogen, lead particles and chlorofluorocarbons (CFCs) which pollute the air. For example, the emissions from the oil refinery at Mathura and the numerous coal burning industries at Agra contain sulphur dioxide which causes acid rain. Many industries produce chemicals, some of which escape into the atmosphere causing air pollution.
4. Agricultural activities: Excessive use of fertilizers and pesticides in agriculture pollutes the air. Pesticides are those chemical compounds which are used for killing pests that destroy agricultural production or in some way are harmful to humans.
5. Burning of refuse: Due to the burning of refuse, a lot of smoke and ash is produced into the atmosphere. Air is polluted by the presence of gases like sulphur dioxide, carbon dioxide and oxides of nitrogen.
6. Thermal power plants: In thermal power plants huge amount of coal is burnt to produce electricity. Thus, smoke and fly ash is released into the atmosphere. Fly ash consists of minute particles of silica, alumina, lead, arsenic, etc. It can cause irritation and respiratory disorders.
7. Nuclear power plants: They pollute air by releasing radioactive rays.
8. Deforestation: Indiscriminate cutting of trees and clearing of forests increase the amount of carbon dioxide in the atmosphere and thereby pollutes it.
9. Use of chlorofluorocarbons : In refrigeration, fire extinguishers and aerosol sprayers pollute air by depleting the ozone layer.
10. Smoke: Smoke is generated from the exhaust of vehicles like bus, car, autorickshaw, or a scooter. It also comes out from a factory chimney. Speeding cars and trucks cause dust to rise from the roads. Fly ash is generated by the thermal power plants. Cigarette smokers also add to air pollution. They not only harm themselves, but also harm people around them who are forced to inhale the cigarette smoke.
11. Stone dust: Fine dust of stone particles is produced when stones are dug out from beneath and cut, polished or crushed. This stone dust enters into the air. When the air is inhaled the damages the respiratory organs. It can cause many serious disorders like cancer, etc.
_____________________ is the main reason for decrease in species diversity in tropical countries. | |||
| Right Option : B | |||
| View Explanation | |||
Which of following is a cause of air pollution? | |||
| Right Option : B | |||
| View Explanation | |||
Which of the following are correct : (a) Most of the pollution from human activities comes from industries and vehicles burning fossil fuels. (b) Smoke gets into the air from sources like aeroplanes, kitchens and steam-engines. (c) Increase in population increases the demand for more space and food. | |||
| Right Option : D | |||
| View Explanation | |||
Students / Parents Reviews [10]
My experience was very good with Abhyas academy. I am studying here from 6th class and I am satisfied by its results in my life. I improved a lot here ahead of school syllabus.
Ayan Ghosh
8thIt was good as the experience because as we had come here we had been improved in a such envirnment created here.Extra is taught which is beneficial for future.
Eshan Arora
8thOne of the best institutes to develope a child interest in studies.Provides SST and English knowledge also unlike other institutes. Teachers are co operative and friendly online tests andPPT develope practical knowledge also.
Aman Kumar Shrivastava
10thAbhyas Methodology is very good. It is based on according to student and each child manages accordingly to its properly. Methodology has improved the abilities of students to shine them in future.
Manish Kumar
10thMy experience with Abhyas is very good. I have learnt many things here like vedic maths and reasoning also. Teachers here first take our doubts and then there are assignments to verify our weak points.
Shivam Rana
7thAbout Abhyas metholodology the teachers are very nice and hardworking toward students.The Centre Head Mrs Anu Sethi is also a brilliant teacher.Abhyas has taught me how to overcome problems and has always taken my doubts and suppoeted me.
Shreya Shrivastava
8thA marvelous experience with Abhyas. I am glad to share that my ward has achieved more than enough at the Ambala ABHYAS centre. Years have passed on and more and more he has gained. May the centre flourish and develop day by day by the grace of God.
Archit Segal
7thIt has a great methodology. Students here can get analysis to their test quickly.We can learn easily through PPTs and the testing methods are good. We know that where we have to practice
Barkha Arora
10thMy experience with Abhyas academy is very good. I did not think that my every subject coming here will be so strong. The main thing is that the online tests had made me learn here more things.
Hiya Gupta
8thAbhyas is a complete education Institute. Here extreme care is taken by teacher with the help of regular exam. Extra classes also conducted by the institute, if the student is weak.
