Class 8 science chapter 8 pollution question answer | std 8 science ch 8 question answer | Exercise
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sz edu tutorial
1. Following are some statements about
pollution. Which type of pollution do
those express?
a. Fog seems to be appearing in Delhi
during day hours.
b. Many times, vomiting and dysentery
occurs after eating 'pani puri'.
c. Problem of sneezing occurs sometimes
during visit to garden.
d. Crop does not grow up in some areas.
e. People living in the busy squares face
the problems like short breathing and
other respiratory problems.
2. Read the passage and identify the sen-
tences expressing types of pollution.
Nilesh is a student of std. VIII and lives
in urban area. It takes about an hour to go
to the school by bus. He faces the heavy
traffic of two wheelers, four wheelers,
rickshaws, buses while going to school.
He is facing the problem of asthma since
last few days. Doctors recommended him
to stay away from urban area. Since then,.
his mother sent him to the village of his
maternal uncle. Nilesh saw the heaps of
garbage at many places in village. Foul
smell of human and animal wastes was
present at many places. Blackish water
with foul smell was flowing in a stream.
He developed some abdominal disease
within few days.
Exercises
3. Match the pairs from 'A' and 'B' col-
umns and explain the effect of pollution
on human health.
Column 'A'
1. Water
containing cobalt
2. Methane gas
3. Water containing
lead
4. Sulphur dioxide
5. Nitrogen dioxide
Column 'B'
a. Mental
retardedness
b. Paralysis.
c. Inflammation
of lungs.
d. Skin cancer
e. Irritation of
eyes
4. True or false
a. Water does not get polluted by washing
the cloths in running water of river.
b. More the use of electric appliances,
more will be the pollution.
61
5. Answer the following.
a. What is pollution?
b. What are pollutants?
c. What is acid rain?
d. What is green house effect?
e. Which are visible pollutants known to
you?
f. Which are invisible pollutants?
6. Answer the following
a. Give two examples of each of water, soil
and air pollution from your residential
area.
b. How does the pollution occur due to
vehicles? Give the names of vehicles
causing least pollution.
c. What are natural reasons for water
pollution?
d. Suggest four preventive measures for air
pollution.
e. Explain relation between green house
effect and global warming.
f. Construct two slogans each on air, water
and soil pollution.
Classify the following pollutants into
natural and manmade categories.
Sewage, dust, pollen grains, chemical
fertilizers, vehicular smoke, algae,
pesticides, waste of animals and birds.
Project:
7.
1. Visit the water testing laboratory in your
area and collect the information about
tests for checking the purity of water.
2. Visit the square having heavy traffic
in your area and report the pollution at
different times of day and find out the
duration of maximum pollution.
15.0
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