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
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
For classification, Biology uses
  1. artificial system
  2. natural system
  3. neutral system
  4. a tracking system
Sucrose developed from excess sugars is transported for storage to
  1. seeds
  2. stem tubers
  3. root tubers
  4. all of these
To donate blood a person shall weigh a minimum of
  1. 35 kg
  2. 45 kg
  3. 55 kg
  4. 65 kg
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