RBSE Solutions Class 11 Biology Chapter 41 Environmental Pollution

 

Question 1. The main reason of pollution in Metropolitan (big) cities –
(a) Domestic fuel
(b) Vegetation
(c) Increased population
(d) Motor vehicles
Answer: (d) Motor vehicles
In simple words: In large cities, the biggest cause of pollution is the many vehicles on the roads. They release harmful gases that dirty the air.

🎯 Exam Tip: When considering urban pollution, always remember that vehicle emissions are a primary contributor due to the high density of cars.

 

Question 2. Sound pollution is measured in –
(a) kg
(b) dB
(c) DU
(d) Hz
Answer: (b) dB
In simple words: The unit used to measure how loud sounds are, which helps us know if it's noise pollution, is called decibels (dB).

🎯 Exam Tip: Remember the common units for different types of pollution; decibels (dB) specifically relate to sound intensity.

 

Question 4. Which pollution causes acid rain –
(a) Pesticides
(b) SO2 and NO2
(c) Carbon particles
(d) Dust particles
Answer: (b) SO2 and NO2
In simple words: Acid rain happens when sulfur dioxide (\( \text{SO}_2 \)) and nitrogen dioxide (\( \text{NO}_2 \)) mix with water in the air. These gases come mostly from burning fuels.

🎯 Exam Tip: Focus on the specific gaseous pollutants, sulfur dioxide and nitrogen dioxide, as key components in the formation of acid rain.

 

RBSE Class 11 Biology Chapter 41 Very Short Answer Questions

 

Question 1. When the world pollution day is celebrated?
Answer: World Pollution Day is celebrated on July 11th.
In simple words: July 11 is observed as World Population Day.

🎯 Exam Tip: Pay attention to dates related to environmental awareness, as they are often asked in short answer questions.

 

Question 2. Most affected country from the ozone hole is?
Answer: Australia is the country most affected by the ozone hole.
In simple words: The ozone hole has its biggest impact on Australia.

🎯 Exam Tip: Link specific environmental issues, like the ozone hole, to the geographical regions most impacted by them.

 

Question 3. Reason of itai-itai disease is?
Answer: Itai-itai disease is caused by cadmium pollution, which leads to weak and brittle bones.
In simple words: This disease happens because of cadmium poisoning, making bones weak and easy to break.

🎯 Exam Tip: Remember specific diseases caused by different pollutants, for instance, itai-itai and cadmium.

 

Question 5. What is Smog?
Answer: Smog is a mixture of ozone (\( \text{O}_3 \)), peroxyacetyl nitrate (PAN), and nitrogen oxide (NO). It forms a thick, hazy air pollution.
In simple words: Smog is a type of air pollution made up of different gases, mainly ozone, PAN, and nitrogen oxide.

🎯 Exam Tip: When defining smog, ensure you list its primary chemical components to score full marks.

 

Question 6. Which pollution is damaging the Taj Mahal?
Answer: Sulfur dioxide (\( \text{SO}_2 \)) pollution is damaging the Taj Mahal. This gas contributes to acid rain, which corrodes the marble.
In simple words: The Taj Mahal is being damaged by sulfur dioxide, which comes from air pollution.

🎯 Exam Tip: Remember specific examples of environmental damage caused by pollutants, like \( \text{SO}_2 \) affecting historical monuments.

 

Question 7. Which sound level is considered as sound pollution.
Answer: A sound level of 80 dB or more is generally considered to be sound pollution.
In simple words: Sound becomes noise pollution when it reaches 80 decibels or higher.

🎯 Exam Tip: Learn the threshold for sound levels that classify as noise pollution to answer accurately.

 

Question 8. Which system get affected in Minamata disease?
Answer: Minamata disease primarily affects the nervous system. It is caused by severe mercury poisoning.
In simple words: Minamata disease harms the brain and nerves, and it is caused by mercury.

🎯 Exam Tip: Connect specific diseases, like Minamata, to the particular body system they impact and the pollutant responsible.

 

Question 9. Which are the biodegradable pollutants?
Answer: Biodegradable pollutants include remnants of plants and animals. These substances can be naturally broken down by microorganisms.
In simple words: Things like old plants and animal remains are biodegradable pollutants because nature can break them down.

🎯 Exam Tip: Define biodegradable pollutants by providing examples of organic matter that naturally decompose.

 

Question 10. Which are the non-biodegradable pollutants?
Answer: Non-biodegradable pollutants include substances like DDT, BHC, 2-4D, and plastics. These materials do not break down naturally and persist in the environment.
In simple words: Pollutants like DDT, BHC, a chemical called 2-4D, and plastics do not break down naturally and stay in the environment for a very long time.

🎯 Exam Tip: When listing non-biodegradable pollutants, include synthetic chemicals and plastics that do not decompose easily.

 

Question 12. Is nuclear pollution possible by natural source?
Answer: Yes, nuclear pollution is possible from natural sources. Naturally occurring radioactive elements can cause this type of pollution.
In simple words: Yes, natural things can also cause nuclear pollution because some elements found in nature are radioactive.

🎯 Exam Tip: Remember that while human activities are the main cause, natural radioactivity can also lead to nuclear pollution.

 

Question 13. Give one measure to stop nuclear pollution.
Answer: One important measure to stop nuclear pollution is the prohibition of atomic blasts. Preventing such explosions significantly reduces radioactive release.
In simple words: Stopping atomic bomb tests is one way to prevent nuclear pollution.

🎯 Exam Tip: Focus on major international policies or actions when asked for measures to control global environmental issues like nuclear pollution.

 

RBSE Class 11 Biology Chapter 41 Short Answer Questions

 

Question 1. Define soil pollution?
Answer: Soil is the upper part of the earth that provides nutrients and food to living organisms. Soil pollution is defined as any unwanted change in the physical, chemical, and biological properties of the soil.
In simple words: Soil pollution happens when the good qualities of soil, like its physical nature, chemicals, or living things, get changed in a bad way.

🎯 Exam Tip: A good definition of soil pollution should highlight the "unwanted change" in the soil's properties, rather than just stating general harm.

 

Question 2. Write the main pollutants causing air pollution.
Answer: The main pollutants causing air pollution include:
1. Gases: Burning fuels in homes and industries release harmful gases like carbon monoxide (CO), carbon dioxide (\( \text{CO}_2 \)), hydrocarbons, nitrogen oxides (NO, \( \text{N}_2\text{O} \)), and hydrogen sulfide (\( \text{H}_2\text{S} \)). These gases are very bad for life.
2. Chemicals: Many harmful non-gaseous chemicals, such as arsenic, benzene, cadmium, chlorine, fluoride, formaldehyde, hydrogen fluoride, manganese, nickel, and lead, are released from industries like coal and oil furnaces, glass factories, refineries, steel plants, vehicle exhausts, fertilizer plants, and power stations. These chemicals pose a serious health risk.
3. Particulate Matter: Tiny solid or liquid particles suspended in the air are a major cause of air pollution. They can be solid, liquid, or colloidal (like fine dust or mist).
In simple words: Air pollution is mainly caused by harmful gases from burning fuels, dangerous chemicals from factories like lead and arsenic, and tiny solid or liquid particles floating in the air.

🎯 Exam Tip: Categorize air pollutants into gases, chemicals, and particulate matter, and provide 2-3 examples for each category for a comprehensive answer.

 

Question 4. Write the main pollutants of sound pollution.
Answer: The main sources that cause sound pollution are:
1. Noise from Industries: Increased production due to machines also means more sound pollution. This noise can be bad for health. In many factories, sound levels are 120 dB or higher.
2. Noise from Aeroplanes: Airplanes are a big source of noise pollution, producing sounds of 150 dB or more. Homes and buildings near airports can develop cracks, and people living close by may suffer hearing loss and become irritable.
3. Noise from Motor Vehicles: The rising number of vehicles for transport leads to noise pollution, especially in big cities like Delhi, Kolkata, Mumbai, and Chennai.
4. Noise from Loudspeakers and Generators: Nowadays, loudspeakers are used more in various events, which greatly increases sound pollution. Generators also add to this problem by producing noise.
In simple words: Sound pollution comes from loud noises made by factories and machines, airplanes, a lot of motor vehicles, and loudspeakers and generators used for events.

🎯 Exam Tip: When asked about sources of sound pollution, categorize them by origin (e.g., industrial, transport, recreational) and give specific examples for each.

 

Question 5. What are the main pollutants of soil pollution.
Answer: Soil is the upper layer of the earth that supports life by providing nutrients. It is called "Mother Earth" as it sustains all living organisms. Soil pollution happens when there are unwanted changes in its physical, chemical, or biological properties. These changes are caused by various pollutants.
In simple words: Soil pollution happens when the natural qualities of the soil are harmed by things like waste, chemicals, and other harmful substances, making it less able to support plants and animals.

🎯 Exam Tip: When discussing soil pollution, remember to define soil and how its fundamental properties are affected by pollutants.

 

Question 6. What are the side effects of sound pollution.
Answer: The harmful effects of sound pollution include:

• Gradual hearing loss, which can sometimes lead to complete deafness.


• It causes feelings of irritation and restlessness.

In simple words: Too much loud noise can make people lose their hearing over time and feel annoyed or unable to relax.

🎯 Exam Tip: List both the direct physiological (like hearing loss) and psychological (like irritability) effects of sound pollution.

 

Question 7. How air pollution can be checked?
Answer: Air pollution can be controlled by implementing several measures:

• Old motor vehicles, which cause more pollution, should be banned.


• Use catalytic converters in vehicles to reduce harmful gases from exhaust.


• Promote alternative fuels like CNG (Compressed Natural Gas) in big cities. Electric public transport (buses, railways) should also be used more.


• Replace 2-stroke engine vehicles, which pollute more, with 4-stroke engine vehicles.


• Electricity generators should not be allowed in cities.


• Nuclear tests must be completely prohibited.


• Modern techniques should be used in industries to reduce smoke. Gas burners or smokeless burners should be used in homes.


• Particulate matter can be removed from the air using methods like electrostatic precipitation.

In simple words: To control air pollution, we need to stop using old vehicles, use cleaner fuels and engines, ban nuclear tests, and make factories and homes produce less smoke and harmful particles.

🎯 Exam Tip: Provide a range of solutions covering vehicle emissions, industrial practices, and domestic fuel use when asked about controlling air pollution.

 

Question 8. What are the main ill effects of water pollution.
Answer: Water pollution causes many harmful effects:
1. Sewage-polluted water can lead to diseases like typhoid, diarrhea, jaundice, and cholera.
2. Contact with soil containing human waste can cause worm infections such as hookworm and Ascaris.
3. Bathing in polluted water may cause Weil's disease, schistosomiasis, and other skin problems.
4. Drinking polluted water containing chemicals like DDT and BHC can cause miscarriages and birth defects. Also, non-biodegradable pollutants can build up in the food chain, becoming more concentrated at higher levels (biomagnification).
In simple words: Dirty water can cause many diseases like typhoid and cholera, skin problems, and worm infections. Harmful chemicals in water can also cause birth problems and build up in living things over time.

🎯 Exam Tip: Categorize the ill effects of water pollution into infectious diseases, skin problems, and long-term chemical impacts like biomagnification.

 

Question 9. Why pollution control is required?
Answer: Pollution control is necessary to protect our valuable environmental resources and to improve the overall quality of the environment. It helps maintain a healthy planet for all living beings.
In simple words: We need to control pollution to save our natural environment and make sure the air, water, and land stay clean and healthy for everyone.

🎯 Exam Tip: Emphasize both resource preservation and improvement of environmental quality as key reasons for pollution control.

 

Question 10. Write the chemical names of the main pollutants.
Answer: Many harmful non-gaseous chemicals act as major pollutants. These include substances like arsenic, benzene, cadmium, chlorine, fluoride, formaldehyde, hydrogen fluoride, manganese, nickel, and lead. These are released from various industries, such as coal and oil furnaces, glass factories, refineries, steel plants, motor vehicles, fertilizer plants, and power houses. They pose a serious threat to health.
Additionally, chemical fertilizers used in agriculture contain various chemicals that can harm animals and humans.
In simple words: Many bad chemicals from factories and fertilizers, like arsenic, lead, and cadmium, are major pollutants because they harm living things.

🎯 Exam Tip: When listing chemical pollutants, include common examples from both industrial emissions and agricultural practices, and mention their widespread health impacts.

 

RBSE Class 11 Biology Chapter 41 Essay Type Questions

 

Question 1. Write the definition, factors and prevention of air pollution?
Answer: Air pollution occurs when harmful pollutants enter the air, causing damaging effects on humans, plants, and animals. It mainly involves toxic gases.

Sources of Air Pollution (Factors):
1. Motor Vehicles: Vehicles are a major source of air pollution, and their increasing numbers worsen the problem. Diesel vehicles, in particular, produce black smoke containing carbon monoxide (CO), carbon dioxide (\( \text{CO}_2 \)), hydrocarbons, nitrogen compounds, and sulfur, all of which are harmful.
2. Combustion of Fuel (Wood and Coal): Burning wood and coal in homes and industries releases many harmful gases like CO, \( \text{CO}_2 \), and \( \text{SO}_2 \) when combustion is complete. Oil refineries and thermal power plants release smoke with \( \text{SO}_2 \), \( \text{CO}_2 \), and \( \text{H}_2\text{S} \) gases, which are toxic. Chemical industries also release deadly elements like HCl, Cl, NO, Hg, Cu, Pb, As, and Zn, which are harmful to humans and other animals.
3. Power Generators: Electricity consumption is rising due to urbanization and industrialization. Since electricity generation is less than demand, domestic generators are used, contributing to both sound and air pollution. The smoke from these generators causes irritation and respiratory illnesses.

Main Air Pollutants:
1. Gases: Burning fuels in homes and industries releases gases such as CO, \( \text{CO}_2 \), Hydrocarbons, NO, \( \text{NO}_2 \), \( \text{H}_2\text{S} \), which are harmful to life.
2. Chemicals: Many harmful non-gaseous chemicals, including arsenic, benzene, cadmium, chlorine, fluoride, formaldehyde, hydrogen fluoride, manganese, nickel, and lead, are released from industries like coal and oil furnaces, glass factories, refineries, steel plants, motor vehicles, fertilizer plants, and power plants. These chemicals pose a serious health threat.
3. Particulate Matter: Tiny solid or liquid particles suspended in the air are a major cause of air pollution. They can be solid, liquid, or colloidal.

Harmful Effects of Air Pollution:
Air pollution disrupts ecosystems and causes serious health problems, including:
A. Effect on Human health:

• It causes respiratory diseases such as bronchitis, throat pain, lung cancer, and silicosis.


• \( \text{SO}_2 \) and \( \text{NO}_2 \) can cause emphysema, cancer, blood vessel diseases, and eye irritation.


• Smog, which is a mix of Ozone, PAN, and NO, is very harmful and often called brown air. It leads to lung diseases.


• Lead from vehicle exhaust can cause multi-organ toxicity, damaging the liver, bones, and lungs, and affecting the nervous system.


• Silicosis develops in workers in stone industries and mining.

B. Effect on Vegetation:
Air pollution significantly harms plants. It reduces photosynthesis, causes leaves to fall or turn black (due to \( \text{SO}_2 \)), and leads to fewer flowering buds and fruit formations.
C. Green House Effect: Excess greenhouse gases, especially \( \text{CO}_2 \), in the air contribute to the greenhouse effect, leading to global warming.
D. Acid Rain: Air pollution from \( \text{SO}_2 \) and \( \text{NO}_2 \) causes acid rain. \( \text{SO}_2 \) reacts with water to form sulfuric acid, and \( \text{NO}_2 \) forms nitric acid. Acid rain damages forests and historical structures like the Taj Mahal.

Prevention of Air Pollution (Control of Air Pollution):
1. Old motor vehicles, which cause more pollution, should be prohibited.
2. Use catalytic converters in vehicles to remove harmful gases.
3. Promote alternative fuels like CNG in big cities and use electrical public transport (buses, railways).
4. Replace 2-stroke engine vehicles with 4-stroke engine vehicles.
5. Electricity generators should not be allowed in cities.
6. Nuclear tests must be completely banned.
7. Modern techniques should be used in industries to reduce smoke. Gas burners or smokeless burners should be used in homes.
8. Particulate matter can be removed from the air using electrostatic precipitators.
In simple words: Air pollution is harmful substances in the air that hurt living things. It comes from vehicles, burning fuels, and power generators, releasing gases like carbon monoxide, chemicals like lead, and tiny particles. This causes breathing problems, organ damage in humans, global warming, and acid rain. To prevent it, we need to stop using old vehicles, use cleaner fuels and engines, ban nuclear tests, and make factories and homes produce less smoke and harmful particles, using modern technologies like catalytic converters and electrostatic precipitators.

🎯 Exam Tip: For comprehensive answers on air pollution, remember to define it, list diverse sources, categorize pollutants, explain impacts on human health, vegetation, global warming, and acid rain, and provide various control measures covering vehicles, industry, and energy production.

 

Question 2. Write the pollutants, harmful effects and control of water pollution.
Answer: Water pollution is caused by many unwanted and harmful inorganic, organic, or biological elements that contaminate water. These pollutants are very damaging to life, as water forms a major part of protoplasm.

Sources and Pollutants of Water Pollution:
Natural sources are hard to control, but human-caused sources can be managed. These include:
1. Sewage and Domestic Waste: These are a big threat, increasing with urbanization. They are released directly into rivers, ponds, and lakes, polluting the water. Sewage contains city garbage and human waste, which reduces oxygen in the water, harming aquatic life.
2. Industrial Waste: Industrialization and population growth contribute to water pollution. Many industries, such as plastic, rubber, paper, soap, and chemical factories, release harmful substances. Some heavy metals (like cadmium and mercury) from industrial waste cause diseases.
3. Pesticides: Pesticides are used to protect crops from harmful insects. These chemicals eventually wash into water bodies with rainwater and can be detrimental to human health.
4. Chemical Fertilizers: Fertilizers provide nutrients to crops but also contain various chemicals that harm animals and humans.
5. Thermal Pollution: The temperature of water bodies (oceans, ponds) increases due to industries and atomic blasts. This high temperature is harmful to aquatic life, like fish and algae.
6. Oil Pollution: Crude oil spills from large ships during ocean transport create a thick layer on the water, causing aquatic animals to die from lack of oxygen (asphyxia).

Harmful Effects of Water Pollution:
Water pollution causes many types of detrimental effects, such as:
1. There is biomagnification of non-biodegradable pollutants, meaning their concentration increases at higher trophic levels.
2. Industrial waste can cause diseases related to the liver, kidney, and brain.
3. Polluted water can also cause specific diseases:

• Mercury pollution causes Minamata disease, affecting the nervous system, leading to numbness in feet, lips, tongue, paralysis, and epilepsy.


• Lead pollution causes diseases related to muscles and the central nervous system.


• Fluoride pollution in water results in fluorosis, affecting teeth and bones, causing legs to bend outwards (Knock Knee Syndrome).


• Cadmium pollution in water causes Itai-itai or ouch-ouch disease.

Control of Water Pollution:
1. Ecological stabilization is the most effective way to control water pollution.
2. Public awareness campaigns (using movies, symposiums) should highlight the harmful effects of water pollution.
3. Wastes should be reused after recycling.
4. Drinking water should be treated to make it suitable for consumption.
5. The quality of water bodies should be checked regularly.
In simple words: Water pollution happens when harmful things like sewage, industrial waste, pesticides, fertilizers, hot water from factories, and oil spills get into water. These pollutants can build up in living things, cause diseases like Minamata or Itai-itai affecting nerves and bones, and harm aquatic life. To control it, we need to make people aware, recycle waste, treat drinking water, and regularly check water quality.

🎯 Exam Tip: A complete answer on water pollution requires detailing its sources (e.g., sewage, industrial, agricultural), specific pollutants (e.g., heavy metals, pesticides), various harmful effects (diseases, biomagnification), and practical control measures (awareness, recycling, treatment).

 

Question 3. Write the main pollutants, harmful effects and control of soil pollution.
Answer: Land is a part of the earth, and its upper layer, called soil, provides nutrients and food for all living organisms. Earth is often called "Mother" because it sustains all life. Soil has specific physical, chemical, and biological properties. Soil pollution is defined as any change in these properties that is harmful.

Sources and Types of Soil Pollution:
1. Domestic Wastes: These are a major cause of soil pollution in India, partly due to a lack of developed waste disposal systems. Domestic wastes include glass, plastic, polythene, kitchen waste, and rusted iron. The problem is growing with urbanization.
2. Agricultural Wastes: Agricultural waste also causes soil pollution. In agriculture-dominated countries like India, with most of the population involved in farming, agricultural waste is of two types:

• Biodegradable: This includes rotten fruits and vegetables, which are naturally broken down and cause less harm.


• Non-biodegradable: This includes insecticides like DDT, BHC, Aldrin, and Heptachlore. These are highly dangerous and remain in the soil for very long periods.

3. Plastic Wastes: Plastic waste is non-biodegradable and poses a serious threat to pollution control. Polythene bags, commonly used domestically, are often thrown away improperly. There is no proper scientific way to dispose of plastic waste.

Effects of Soil Pollution:
Soil pollution is harmful both directly and indirectly.
(a) Indirect effects:

• Houseflies sit on human waste and then on food, spreading diseases like diarrhea, dysentery, cholera, and typhoid.


• Cockroaches live in debris and kitchens, destroying food and increasing the risk of infection.


• Using sewage for agriculture over time reduces soil fertility.

(b) Direct effects:
Direct contact with polluted soil and inhaling pollutants can cause allergies, asthma, enteritis, arthritis, skin diseases, and tuberculosis.

Control of Soil Pollution:
Soil pollution can be controlled by these measures:
1. Proper disposal of garbage should be enforced, and improper disposal should be considered a punishable crime.
2. Educating students at schools and colleges about the benefits of a clean environment is important.
In simple words: Soil pollution happens when harmful things like household waste, farm chemicals (especially non-biodegradable ones), and plastics get into the soil. This leads to diseases spread by insects, reduced soil fertility, and direct health issues like allergies. To control it, we need proper garbage disposal and education on keeping the environment clean.

🎯 Exam Tip: A comprehensive answer on soil pollution requires defining it, listing diverse sources (domestic, agricultural, plastic), explaining both indirect (disease vectors, fertility loss) and direct (health issues) effects, and providing control measures (waste disposal, education).

 

Question 4. Write the main pollutants, harmful effects and control of sound pollution.
Answer:
Definition:
1. Sound pollution is disturbing or excessive noise that can harm human or animal activity and balance.
2. It is a form of environmental sound that is generally considered likely to annoy, distract, or even harm people.

Measurement of Sound Pollution:
The loudness of sound is measured in decibels (dB), which is the unit of sound loudness. It is measured with a Decibel meter or Larm barometer. The unit of sound frequency is Hertz (Hz). Humans can hear sounds between 20 to 20,000 Hertz.
Sound levels of 80 dB or more are considered sound pollution. Normal conversation is around 60 dB. Sound levels above 90 dB are harmful to humans, with an upper tolerance limit of 120 dB. Some sound values from different sources are:

• Audible sound - 15 dB or more


• Quiet office/room - 30 dB


• Average home - 50 dB


• Normal conversation - 60 dB


• Highways - 60 dB or 80 dB


• Shouting - 90 dB


• Industries and Machines - 110 dB


• Intolerable sound (DJ etc.) - 130 dB


• Jet aeroplane sound - 150 dB

Sources of Sound Pollution:
1. Noise by Industries: Increased production due to mechanization also increases sound pollution, which is harmful to health. Industrial sound levels can be 120 dB or more.
2. Noise by Aeroplanes: Airplanes are major sources, producing 150 dB or more. Homes near airports can crack, and residents may suffer hearing loss and irritability.
3. Noise by Motor Vehicles: The rising number of vehicles contributes to noise pollution, especially in big cities like Delhi, Kolkata, Mumbai, and Chennai.
4. Noise by Loudspeakers and Generators: Increased use of loudspeakers in programs and generators for electricity supply contribute significantly to sound pollution, affecting factories, markets, and homes.

Effects of Sound Pollution:
The harmful effects of sound pollution include:

• Gradual hearing loss, potentially leading to complete deafness.


• Causes irritability and restlessness.


• May cause ulcers in the small intestine.


• Sudden excessive sound may lead to abortion.


• Insomnia (difficulty sleeping).


• Reduced working capacity.


• Loss of appetite.


• Increase in blood pressure (B.P.).

Control of Noise Pollution:
1. Control noise in industries through proper measures; industries should be located in outer areas.
2. Airports should be far away from populated areas.
3. Dense tree plantation is required around industries and airports to absorb sound.
4. Loudspeakers and generators should be banned.
5. Public awareness should be raised about the harmful effects of noise pollution.
In simple words: Sound pollution is very loud or unwanted noise that disturbs life. It's measured in decibels (dB), with 80 dB or more considered harmful. Different noises, from quiet rooms to jet planes, have different dB levels. Sound pollution comes from loud industries, airplanes, many vehicles, and loudspeakers, causing gradual hearing loss, irritation, ulcers, sleep problems, and high blood pressure. To control it, industries and airports should be moved away from people, more trees should be planted, loudspeakers banned, and people taught about its dangers.

🎯 Exam Tip: For essay questions on noise pollution, ensure you cover its definition, sources (industrial, transport, entertainment), a range of harmful effects (physical and psychological), and various control measures (urban planning, technology, public awareness).

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