Class VII

Which of the following plant absorbs wastewater?
  1. Acacia
  2. Populus
  3. Betula
  4. Eucalyptus
Effluent is mainly generated from which of these?
  1. Hospitals 
  2. Factories 
  3. House 
  4. Offices 
Biogas is used as
  1. source of energy
  2. waste disposal
  3. both of these
  4. none of these
Which of the following is not a water-borne disease?
  1. Cholera
  2. Meningitis
  3. Hepatitis
  4. Measles
Biodegradable waste 
  1. Does not decompose
  2. Decomposes in nature by microbes
  3. Accumulates in environment
  4. Enters the food chains then causes bio magnification
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