Which of the following is not an effect of acute scarcity of water on plants?
shortage of food
shortage of oxygen
shortage of carbondioxide
shortage of rainfall
Dried sludge is used as
waste material
manure
cattle food
fuel
The minimum amount of water recommended by the United Nations per person per day is
25L
50L
75 L
40L
Which natural process continuously converts some of the saline sea water into freshwater?
Evaporation
Transpiration
Infiltration
Water cycle
Organic impurities present in waste water
Pesticides
Nitrates
Phosphates
Metals
The water - bearing layer of the earth is called
conifer
hydrosphere
aquifer
water table
Which of the following is not responsible for water shortage?
rapid growth of industries
increasing population
heavy rainfall
mismanagement of water resources
Plants use this gas during respiration
nitrogen
carbondioxide
oxygen
all the above
Percentage of fresh water available on the globe
97%
20%
10%
1%
Roots respire through
Spiracles
Lenticels
Stomata
Air spaces
