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Problem Solving Assessment(PSA)
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Question-1
Materials of biological origin which are commonly used to maintain and improve soil fertility are:
(A)
Green manure
(B)
Biofertilizers
(C)
Bio-insecticides
(D)
Both 1 and 2
Question-2
The process of converting atmospheric nitrogen into nitrates is called:
(A)
Nitrogen fixation
(B)
Nitrogenation
(C)
Nitrification
(D)
DEnitrification
Question-3
What minerals are found in the run-off from agricultural land and un-treated sewage effluents that are responsible for eutrophication of water bodies?
(A)
Phosphorous and carbon
(B)
Nitrogen and phosphorus
(C)
Potassium and arsenic
(D)
Iron and manganese
Question-4
Water that moves over the ground into lakes and rivers is called:
(A)
Ground water
(B)
Water table
(C)
Run off water
(D)
Water cycle
Question-5
In terms of a food chain or food pyramid, organisms that trap energy, such as plants are known as:
(A)
Carnivores
(B)
Primary consumer
(C)
Herbivores
(D)
Producers
Question-6
Health problems related to air pollution include:
(A)
Coughing
(B)
Asthma
(C)
Bronchitis
(D)
All of these
Question-7
The process by which water vapor changes to liquid form is called:
(A)
Condensation
(B)
Evaporation
(C)
Transpiration
(D)
Precipitation
Question-8
Which of the following are floating ocean plants or animals?
(A)
Plankton
(B)
Benthes
(C)
Terrenus
(D)
Microbes
Question-9
Bacterium drives the cycle of which of the following elements?
(A)
Carbon
(B)
Nitrogen
(C)
Oxygen
(D)
Energy
Question-10
The way in which carbon is used and reused in the ecosystem is called:
(A)
Energy cycle
(B)
Energy pyramid
(C)
Biotic/abiotic cycle
(D)
Carbon cycle
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Std 9
CBSE
Practice in Related Chapters
Tissues
The Fundamental Unit Of Life
Diversity In Living Organisms
Why Do We Fall Ill
Natural Resources
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