Importance of Water
The soil and sand is settled at the bottom in
metal screen
grit tank
sludge tank
filter bed
grit tank
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Crops grow well when they areA. 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
Chlorine helps
A. to kill bacteria
B. in heating water
C. in cooling water
D. to evaporate water
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
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