Class IX

Sulfur dioxide (SO2) may be reduced in air, if
  1. catalytic converters are used in cars
  2. car pools are used
  3. filters or scrubbers are used in chimneys
  4. ozone friendly products are introduced
To donate blood a person shall weigh a minimum of
  1. 35 kg
  2. 45 kg
  3. 55 kg
  4. 65 kg
Enzymes catalyze biochemical processes occurring in living cells over
  1. on strong heating
  2. at room temperature
  3. in freezing cold
  4. very narrow temperature range
Drugs useful against bacteria resistant to penicillin include
  1. Cephalosporin
  2. Erythromycins
  3. Augmentin
  4. both A and B
For classification, Biology uses
  1. artificial system
  2. natural system
  3. neutral system
  4. a tracking system
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