Kerala SCERT Class 7 Science Chapter 6 For a Pollution free Nature Question Answer Solution Here. Kerala Board Class 7 Students can find Here 6th Chapter For a Pollution free Nature Notes provide by our Teacher. Important Question Answer from Chapter 6 For a Pollution free Nature.
- Board- Kerala Board.
- Class – 7.
- Subject – Science Part 2
- Chapter – 6.
- Chapter Name – For a Pollution free Nature.
- Topic – Question Answer Solution.
Multiple choice questions.
(1) All living beings depend on factors such as
a) soil
b) air
c) water
d) All the above.
(2) organic matter gets decomposed in soil by the action of microorganisms such as
a)bacteria
b)fungi
c)both
d)none
(3) Components of soil suitable for agriculture are
a) Minerals 45%
b) Water 25%
c) Air 25%
d) Organic matter 5%
e)All the above.
(4) Soil erosion occurs mostly during in
a)summer season
b)monsoon season
c)winter season.
d)none
5) Water is used as drinking water having pH value between
a) 5 – 6
b) 6 – 7
c) 6.5 – 7.5
d) none.
(6) diseases that spread through drinking water are
a) Typhoid
b) cholera
c) dysentery
d) jaundice.
e)All the above.
(7) components of atmospheric air are
a) Nitrogen – 78 %
b) Oxygen – 20.9%
c) Carbon dioxide – 0.03%
d)All the above.
(8)Which gas reduces the oxygen absorption capacity of blood?
a) Carbon monoxide
b) Carbon dioxide
c) Sulphur dioxide
d) Oxides of nitrogen.
9) Which gas Causes global warming?
a) Carbon monoxide
b) Carbon dioxide
c) Sulphur dioxide
d) Oxides of nitrogen
(10) Which gas Causes irritation to eyes, lung cancer and asthma?
a) Carbon monoxide
b) Carbon dioxide
c) Sulphur dioxide
d) Oxides of nitrogen
(11) Which gas Causes acid rain?
a) Carbon monoxide
b) Carbon dioxide
c) Sulphur dioxide
d) Oxides of nitrogen
Questions and answers.
1) What is content of soil?
ANS: Soil contains air, water, minerals and organic matter.
2)What chemical pesticides do?
ANS:Chemical pesticides destroy harmful insects which destroy crops , harmless
Microorganisms.
3) which elements are present in water?
ANS:Water contains various minerals, oxygen, microorganisms and insoluble impurities.
4) What is Aeration?
ANS:The process of mixing water with air is called Aeration.
5) What is Filtration?
ANS:Impurities which do not get settled are removed by the filter,is called filtration.
6) What is Chlorination?
ANS: the process of mixing Chlorine gas or bleaching powder with water.
(7) What is the source of Carbon monoxide?
ANS:the source of Carbon monoxide is Smoke from automobiles.
(8) What is the source of Oxides of nitrogen?
ANS: the source ofOxides of nitrogen is automobiles and factories.
(9) ) What is the source of Sulphur dioxide?
ANS: the source of Sulphur dioxideis is factories.
Short questions and answers.
(1) What are steps in the process of water purification in a watertreatment plant?
ANS:The steps as given below:
i) Aeration
ii) Coagulation
iii) Clariflocculation
iv) Filtration
v) Chlorination
vi) Storage.
(2) How Diseases spread through water?
ANS:i) When the disease causing microorganisms grow in water, it Mixing up of excreta and other pollutants.
ii) The presence of the bacteria E coli, which reach water through excreta causes the disease diarrhoea. Typhoid, cholera, dysentery and jaundice.
(3) What are the water resources in our surroundings?
ANS:The resources are given below:
i) Well
ii) pond
iii) river
iv) brook.
Very good notes
But please put answers of multiple choice questions
That is my complaint
And notes very good
Yes We will not provide this one because We want Students will read the Books. Reading make them deep knowledge on particular topics.