Notes: Our Environment and Natural Calamities (Part- 2) Class 5 Notes | EduRev

Science Class 5

Class 5 : Notes: Our Environment and Natural Calamities (Part- 2) Class 5 Notes | EduRev

The document Notes: Our Environment and Natural Calamities (Part- 2) Class 5 Notes | EduRev is a part of the Class 5 Course Science Class 5.
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Introduction to Pollution
Everything around us is the component of our environment. The components of our environment affect on our health and day to day life. We get disease in the polluted environment and a good environment makes us healthy. The polluting elements in our environment are called pollutants. In this chapter, we will study about the pollutants in our environment and method by which we can eliminate these pollutants. 

Pollution

Notes: Our Environment and Natural Calamities (Part- 2) Class 5 Notes | EduRev

Fig:  Air Pollution

Human activities lead to the production of waste materials that had deteriorated our environment and make them unsuitable for the life. Unwanted and undesirable substances present in air, water and soil are called as pollutant. For example. Sulphur dioxide, Nitrogen oxides, Lead oxides. Hydrocarbons, Fly ashes, Smoke, Dust particles etc.

On the basis of the contaminated source, pollution can be broadly classified into the following types:
Notes: Our Environment and Natural Calamities (Part- 2) Class 5 Notes | EduRev

Air Pollution

Overpopulation, industrialization, modern life style and advancement in science technology has lead to the thoughtless use of natural resources, which in turn spoil air for other activities. This is called air pollution.
Look at the following picture of the causes of air pollution

Notes: Our Environment and Natural Calamities (Part- 2) Class 5 Notes | EduRev

Notes: Our Environment and Natural Calamities (Part- 2) Class 5 Notes | EduRev
Deforestation is one of the big causes of air pollution. Trees are the natural air purifier. Deforestation increase the concentration of carbon dioxide in the air and thereby pollutes it.

Notes: Our Environment and Natural Calamities (Part- 2) Class 5 Notes | EduRevFig: Natural cause of pollution

Eruption of ash from the volcano causes air pollution. Concentration of carbondioxide, hydrogen chloride and sulfur dioxide increases due to the eruption from volcano 
Notes: Our Environment and Natural Calamities (Part- 2) Class 5 Notes | EduRev

Indoor pollutants which are responsible for the air pollution, given in the picture above. We can minimize the pollution by using non polluting elements instead of the given elements.

Consequences of Air Pollution 
Notes: Our Environment and Natural Calamities (Part- 2) Class 5 Notes | EduRev

Air Pollution Causes Diseases 

Notes: Our Environment and Natural Calamities (Part- 2) Class 5 Notes | EduRev
Many respiratory problems Asthma, Bronchitis occur due to inhalation of poisonous gases.
Notes: Our Environment and Natural Calamities (Part- 2) Class 5 Notes | EduRev

  • Pollution is injurious to plant or other animal also.
  • Polluted air can damage lungs.
  • It reduces visibility because of the presence of smoke, dust and vapors.
  • Pollution can damage our nervous system and digestive system.
  • Pollution can cause cancer and neurological disorder. 

 How to Minimize Air Pollution

Look at the following chart to understand the method by which, we can minimize the air pollution:
Notes: Our Environment and Natural Calamities (Part- 2) Class 5 Notes | EduRev
Notes: Our Environment and Natural Calamities (Part- 2) Class 5 Notes | EduRev


Notes: Our Environment and Natural Calamities (Part- 2) Class 5 Notes | EduRevFig: An Eco-Friendly Car
Use electric vehicle to reduce release of harmful gases in the air 

Notes: Our Environment and Natural Calamities (Part- 2) Class 5 Notes | EduRevFig: An eco friendly bus

C0mmonly Asked Questions
If there would be no ozone layer, then which harmful products would not be screened by the atmosphere?
(a) Smog
(b) UV rays
(c) IR rays
(d) All of these
(e) None of these
Answer: (b)

Explanation: Ozone layer in the stratosphere layer of the atmosphere filters the ray of UV to come on the surface of the earth. Due to air pollution ozone layer is depleting, hence allowing UV rays to enter into the earth's atmosphere. Therefore, option (b) is correct and rest of the options is incorrect.

Water Pollution
Water is an essential component of all forms of life. It is odorless, colorless and transparent liquid. It has the capacity to dissolve maximum substances in it and hence is used as a universal solvent. But now a days due to human activities, over population, industrialization and unawareness, the smell, odur and unique quality of water is being contaminated, which is called water pollution.

Notes: Our Environment and Natural Calamities (Part- 2) Class 5 Notes | EduRevFig: Water Pollution

Polluted water causes disease
Water borne diseases can spread through contaminated water. Contaminated water contains pathogenic microorganisms.

How to minimize water pollution

Look at the following chart to understand the method by which we can minimize water pollution:

Commonly Asked Questions:

1. Which one of the following is a factor of water pollution?
(a) Factory's wastes
(b) Pesticides, insecticides, weedicides
(c) Untreated sewage
(d) All of these
(e) None of these
Answer: (d)
Explanation
Factory's wastes. Pesticides, insecticides, weedicides and untreated sewage all are the factors of water pollution. Therefore, option (d) is correct and rest of the options is incorrect.

2. What may be the consequences of water pollution?
(a) Killing of aquatic animals
(b) Disturbance in the ecological balance
(c) Disturbance in the food chain
(d) All of these
(e) None of these
Answer: (d)
Explanation
All are the possible consequences of water pollution that have been given in the option A, B, and C. Therefore, option (d) is correct and rest of the options is incorrect..

Soil Pollution
Excessive, unorganized agriculture and no judicious use of chemical fertilizers, pesticides, weedicides, herbicides and insecticides etc contaminate the soil which is called soil pollution. Polluted soil leads to the growth of polluted plants and this toxicity finally enters the human/ animal's body through food chain. 

Causes of Soil Pollution

Notes: Our Environment and Natural Calamities (Part- 2) Class 5 Notes | EduRev


Polluted Soil Causes Disease 

How can we maintain the quality of soil?
Look at the following chart to understand the method by which, we can maintain the quality of soil  

Commonly Asked Questions

1. Find the statement which is true about soil pollution?
(a) Brain and nerve can be damaged due to soil pollution
(b) Malaria is caused by the protozoa that live in soil
(c) Metals, pesticides, solvents, lead and oil spills are soil contaminants
(d) Deforestation leads to soil pollution
(e) All of these
Answer: (e)
Explanation 
Soil pollution causes many diseases. Hence, all the statements in the options are true. Therefore, option (e) is correct and rest of the options is incorrect.

2. Consider the following statements:
Statement 1: Climate of a region is affected due to soil pollution.
Statement 2: Climate of a region is not affected due to soil pollution.
Which one of the following is correct about the above statements?
(a) Statement 1 is true and 2 is false      
(b) Statement 1 is false and 2 is true
(c) Both statements are true                    
(d) Both statements are false
(e) None of these
Answer; (a)
Explanation
Soil pollution affects vegetation which in turn affects climate. Therefore, option (a) is correct and rest of the options is incorrect..

Noise Pollution
It is the loud unwanted and undesirable sound. Sound at 80 decibel or more gives unpleasant experience and regarded as noise pollution. 90% of noise pollution is due to the noise produced by the motor vehicles etc. 

Look at the following picture of the causes of noise pollution:

Notes: Our Environment and Natural Calamities (Part- 2) Class 5 Notes | EduRevFig: Cause of noise pollution

Classification of Sound in Decibel (db)

Sounds                                         Decibel (db)

Normal talking                                      40 db

Whisper                                                 20 db

Aircraft                                                  120 db

Atomic explosion                                 200 db

Intensity of sound greater than 80 db causes noise pollution.

Consequences of Noise Pollution

Notes: Our Environment and Natural Calamities (Part- 2) Class 5 Notes | EduRev

  Noise Causes Disease

Notes: Our Environment and Natural Calamities (Part- 2) Class 5 Notes | EduRevFig: Ill effects of noise pollution

Our ears are sensible organs which work properly on a specific range of sound.

The brain receives the incoming signal from the ears and analyze it. If the intensity of sound increases, it can damage the nervous system and ultimately may lead to hearing loss. The intensity of sound, which is greater than the sensible capacity of our ears is called loud and unpleasant sound. The effect of unpleasant sound on our head is just like inserting nails in the sensitive head.  

Commonly Asked Questions

Arwin is playing violin and his sister Tina is listening music from the loudspeaker. Which one of the two children is creating more noise pollution as compare to other?
(a) Arwin
(b) Tina
(c) Both Arwin and Tina
(d) Neither Arwin nor Tina
(e) None of these
Answer: (b)
Explanation 
Sound of violin is pleasant but sound of a loudspeaker is always noise because it is at high volume. Therefore, option (b) is correct and rest of the options is incorrect.

Consider the following statements:
Statement 1: A fire engine produces noise pollution.
Statement 2: Leaves falling off a trees produces noise pollution.
Which one of the following is correct about the above statements?
(a) Statement 1 is true and 2 is false
(b) Statement 1 is false and 2 is true
(c) Both 1 and 2 are false
(d) Both 1 and 2 are true
(e) None of these
Answer: (a)
Explanation
Falling of leaves from the trees produces sound of very low decibel that doesn't come under pollution. Therefore, option (a) is correct and rest of the options is incorrect.

You Must Know:

A plastic milk jug takes million years to decompose.

More than 100 active pesticides ingredients are suspected of causing cancer.

Untreated sewage is a significant risk to human health and wealth.

Nitrogen is essential for crops but too much will leak into underground and rivers causing water pollution.

 






 

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