Class XI

Untreated sewage may cause
  1. outbreak of epidemic
  2. cholera outbreaks
  3. typhoid outbreaks
  4. all of these
Pupa survives through
  1. Feeding through water
  2. Feeding through proboscis
  3. Food accumulated in larva stage
  4. Caudal flaps
Hydrogen sulfide (H2S) and ammonia (NH3) are produced from
  1. Chimneys of factories
  2. Use of CFC in foam packaging
  3. Decomposition of organic compounds by anaerobic bacteria
  4. Treatment of acidic wastes with alkalis
An excellent habitat for bacterial growth is
  1. CFC based products
  2. Burning of garbage
  3. Untreated sewage
  4. All
 In grass, function of filament is to
  1. hold pollens firmly
  2. stay inside bract
  3. expose anther to wind
  4. hold grass firm in soil
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