THESE NOTES ARE PREPARED ACCORDING TO JKBOSE SYLLABI IN SIMPLIFIED AND CONCISE PATTERN
Exercise
Q. What are the different ways in which water can get contaminated?
Ans: When any impurity enters water, it is called as water pollution. Water can get contaminated by many ways e.g,
By dumping sewage, waste into water.
By throwing industrial, agricultural waste into water.
By washing clothes, bathing using soaps and detergents in water.
Q. At an individual level, how can you reduce air pollution?
Ans: When any impurity enters air, it is called as air pollution. At individual level, i can reduce air pollution by many ways, e.g
1. I will walk or use bicycle to travel in my village.
2. I will use public transport to travel to far off places.
3. I will plant many trees
4. I will use renewable energy sources
Q. Clear, Transparent water is not always fit for drinking. Comment?
Ans: Clear, transparent water may contain harmful bacteria which cannot be seen by the naked eyes. so the clear water is not always fit for drinking.
Water should be boiled before drinking.
Q. You are a member of muncipal body of your town.
Make a list of measures that would help your town to ensure supply of clean water to all its residents?
Ans: To ensure the supply of clean water to all residents, I will take following steps:
1. First water bodies will be kept clean. Sewage and Industrial wastage will not be allowed to enter it without filteration.
2. Many water tanks will be build and properly mantained.
3. The water will be chlorinated regularly.
4. Proper pipe network will be build so homes have good water supply.
Q. Explain the difference between pure air and polluted air?
Ans: When any impurity enters the air, it is called as air pollution.
Pure air contains nitogen, oxygen, Argon, carbon dioxide etc while as impure air contains harmful gases like carbon monoxide, sulphur dioxide Nitrogen dioxide, smoke in large quantities.
Pure air is healthy for body, where as impure air causes respiratory diseases.
Q. Explain the circumstances that lead to acid rain. How does acid rain affect us?
Ans: When the gases like Nitrogen dioxide and sulphur dioxide increase in atmosphere, they react with water vapours to form nitric acid and sulphiric acid. This form acid rain.
Acid rain is very harmful to earth. It cause soil pollution and damage the crops.
It damages buildings as formation of yellow colour on Taj Mahal is an effect of acid rain.
Q. Which of the following is not the green house gas?
a. Carbon dioxide
b. Sulphur dioxide
c. Methane
d. Nitrogen
Ans: Nitrogen
Q. Describe the "Greenhouse effect" in your own words.
Ans: Greenhouse effect means increase in temperature of a earth due to presence of gases like Carbon dioxide, methane etc.
These gases trap heat waves like the greenhouse used to grow vegetables and are thus called greenhouse gases.
Q. Prepare brief speech on global warming that you have to make in class?
Ans: The greenhouse effect helps our earth to warm and thus support life. But due to the increase in greenhouse gases Global warming has taken place.
Global warming is an increase in the average temperature of the Earth's surface. It has bad impact on earth.
It results in melting of glaciers, increasing water levels, very hot summers, new diseases, flash floods etc.
Q. Describe the threat to the beauty of taj mahal?
Ans: Due to increase in industrial activity around Taj mahal, gases like sulphur dioxide and nitrogen dioxide have increased in atmosphere. It has resulted in acid rain.
The acid rain has corroded the marble of taj Mahal .
Suspended particulate matter emitted from Mathura oil refinery, has also contributed towards yellowing of the marble of Taj.
Q. Why does the increased level of nutrients in water affect the survival of aquatic organisms?
Ans: The increased level of nutrients in the water affects the survival of aquatic organisms because of Biological oxygen demand.
Ans: When any impurity enters water, it is called as water pollution. Water can get contaminated by many ways e.g,
By dumping sewage, waste into water.
By throwing industrial, agricultural waste into water.
By washing clothes, bathing using soaps and detergents in water.
Q. At an individual level, how can you reduce air pollution?
Ans: When any impurity enters air, it is called as air pollution. At individual level, i can reduce air pollution by many ways, e.g
1. I will walk or use bicycle to travel in my village.
2. I will use public transport to travel to far off places.
3. I will plant many trees
4. I will use renewable energy sources
Q. Clear, Transparent water is not always fit for drinking. Comment?
Ans: Clear, transparent water may contain harmful bacteria which cannot be seen by the naked eyes. so the clear water is not always fit for drinking.
Water should be boiled before drinking.
Q. You are a member of muncipal body of your town.
Make a list of measures that would help your town to ensure supply of clean water to all its residents?
Ans: To ensure the supply of clean water to all residents, I will take following steps:
1. First water bodies will be kept clean. Sewage and Industrial wastage will not be allowed to enter it without filteration.
2. Many water tanks will be build and properly mantained.
3. The water will be chlorinated regularly.
4. Proper pipe network will be build so homes have good water supply.
Q. Explain the difference between pure air and polluted air?
Ans: When any impurity enters the air, it is called as air pollution.
Pure air contains nitogen, oxygen, Argon, carbon dioxide etc while as impure air contains harmful gases like carbon monoxide, sulphur dioxide Nitrogen dioxide, smoke in large quantities.
Pure air is healthy for body, where as impure air causes respiratory diseases.
Q. Explain the circumstances that lead to acid rain. How does acid rain affect us?
Ans: When the gases like Nitrogen dioxide and sulphur dioxide increase in atmosphere, they react with water vapours to form nitric acid and sulphiric acid. This form acid rain.
Acid rain is very harmful to earth. It cause soil pollution and damage the crops.
It damages buildings as formation of yellow colour on Taj Mahal is an effect of acid rain.
Q. Which of the following is not the green house gas?
a. Carbon dioxide
b. Sulphur dioxide
c. Methane
d. Nitrogen
Ans: Nitrogen
Q. Describe the "Greenhouse effect" in your own words.
Ans: Greenhouse effect means increase in temperature of a earth due to presence of gases like Carbon dioxide, methane etc.
These gases trap heat waves like the greenhouse used to grow vegetables and are thus called greenhouse gases.
Q. Prepare brief speech on global warming that you have to make in class?
Ans: The greenhouse effect helps our earth to warm and thus support life. But due to the increase in greenhouse gases Global warming has taken place.
Global warming is an increase in the average temperature of the Earth's surface. It has bad impact on earth.
It results in melting of glaciers, increasing water levels, very hot summers, new diseases, flash floods etc.
Q. Describe the threat to the beauty of taj mahal?
Ans: Due to increase in industrial activity around Taj mahal, gases like sulphur dioxide and nitrogen dioxide have increased in atmosphere. It has resulted in acid rain.
The acid rain has corroded the marble of taj Mahal .
Suspended particulate matter emitted from Mathura oil refinery, has also contributed towards yellowing of the marble of Taj.
Q. Why does the increased level of nutrients in water affect the survival of aquatic organisms?
Ans: The increased level of nutrients in the water affects the survival of aquatic organisms because of Biological oxygen demand.
Small algae feed on such nutrients which creates algal bloom. The algae consume lot of oxygen from the water which affect other organisms.
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