Class VI

In leaves, gaseous exchange takes place through tiny pores under leaves known as
  1. stem
  2. stomata
  3. stigma
  4. pollen grain
Condensation point of nitrogen gas is
  1. (-156°C)
  2. (-166°C)
  3. (-196°C)
  4. (-186°C)
In desert areas, water vapor content is
  1. different
  2. higher
  3. low
  4. constant
. Moisture capacity of air is called
  1. vapors
  2. humidity
  3. moist
  4. wet air
A reaction in which oxygen is used up for production of thermal and light energy is known as
  1. production
  2. combustion
  3. reaction
  4. respiration
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