Class XI

Stomata close down if relative humidity of atmosphere falls below
  1. 60%
  2. 80%
  3. 50%
  4. 70%
Passive water absorption by root system is due to
  1. Force created in root
  2. Osmotic pressure in shoot
  3. Tension in sap due to transpiration
  4. High respiratory activity of root
Absorption of water by the solid particles of an absorbent causing it to enormously increase in volume without forming a solution is called
  1. Absortion
  2. Imbibition
  3. Solubility
  4. Adsoption
Cohesion-tension theory is related to
  1. Ascent of sap
  2. Transpiration
  3. Photosynthesis
  4. Respiration
Generally, stomata
  1. Always open
  2. Always closed
  3. Open during night and close at day
  4. Open during day and close during night
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