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Problem Solving Assessment(PSA)

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Question-1 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

Question-2 What is acid rain?

(A) The rain of acids	(B)Evaporation of acids from the industries
(C)Rain water containing dissolved acids	(D)Acidic particles

Question-3 Which of the following are floating ocean plants or animals?

(A) Plankton	(B)Benthes
(C)Terrenus	(D)Microbes

Question-4 Health problems related to air pollution include:

(A) Coughing	(B)Asthma
(C)Bronchitis	(D)All of these

Question-5 If excessive amounts of hot water are discharged into a lake, the immediate result will most likely be:

(A) An increase in the sewage content of the lake	(B)An increase in the amount of dissolved oxygen in the lake
(C)An increase in the amount of PCB pollution in the lake	(D)A decrease in the amount of phosphates in the lake

Question-6 Over the last 100 years, global sea level has risen by about:

(A) 20-25 cm	(B)10-12.5 cm
(C)25-50 cm	(D)Less than 10 cm

Question-7 Which of the following processes fixes carbon in green plants as simple sugars?

(A) Denitrification	(B)Photosynthesis
(C)Carbonation	(D)Bacteria

Question-8 Which of the following indications of the health of a water body is the most widely accepted means of measuring how polluting an effluent is?

(A) COD	(B)BOD
(C)Coliform content	(D)DO

Question-9 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-10 Which of the following pollutants is not present in the vehicular exhaust emissions?

(A) Lead	(B)Ammonia
(C)Carbon monoxide	(D)Particulate matter

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Std 9

CBSE

Practice in Related Chapters
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The Fundamental Unit Of Life
Diversity In Living Organisms
Why Do We Fall Ill
Natural Resources

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