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Problem Solving Assessment(PSA)

Question-1 Phosphates and nitrates entering a lake cause an explosive growth of algae, this is called:

(A) Aestivation	(B)Mutualism
(C)Humus	(D)Algal bloom

Question-2 Water harvesting is:

(A) Collection of river water	(B)Collection of rainwater in storage tanks or in the soil to recharge ground water
(C)Harvesting of water from tube wells	(D)All the above

Question-3 Which sector is the single largest consumer of fresh water in India?

(A) Agriculture	(B)Industry
(C)Domestic	(D)Power

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 Which of the following are floating ocean plants or animals?

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

Question-6 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-7 Bacterium drives the cycle of which of the following elements?

(A) Carbon	(B)Nitrogen
(C)Oxygen	(D)Energy

Question-8 Which sector is the largest emitter of greenhouse gases in India?

(A) Transport	(B)Domestic
(C)Agricultural	(D)Electric power generation

Question-9 The process of photosynthesis and respiration cause the cycling of which element in the environment?

(A) Carbon	(B)Water
(C)Nitrogen	(D)Hydrogen

Question-10 The conversion of nitrogen gas into nitrates by bacteria is called:

(A) Nitrification	(B)Nitrogen fixation
(C)Denitrification	(D)Decay

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Std 9

CBSE

Practice in Related Chapters
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