Chlorine helps

to kill bacteria
in heating water
in cooling water
to evaporate water
to kill bacteria  

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Crops grow well when they are
A. fertilized
B. irrigated
C. cared
D. wilted
Poisonous substances from landfills can be washed away into rivers by
A. flood
B. rainwater
C. underground river water
D. none of these
The poison gets more concentrated as it moves through
A. water
B. food chain
C. fish body
D. vascular bundles in aquatic plants
The maximum percentage of water in a plant or animal is
A. 0.99
B. 0.75
C. 0.8
D. 0.5
The tanks that supply water to towns are built at
A. roofs of buildings
B. high towers
C. town level
D. high lands
Oil can be poison for
A. insect’s life
B. aquatic life
C. animal’s life
D. human life
Under the ground, water can be found in the form of
A. streams
B. ice
C. snow
D. rocks

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