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  • In the mechanism of opening of stomata, the important factor isOption: 1 Turgidity of the guard cellsOp

In the mechanism of opening of stomata, the important factor is

Option: 1

Turgidity of the guard cells


Option: 2

Chlorophyll content of the guard cells


Option: 3

Hormone content of the subsidiary cells


Option: 4

Protein component of the epidermal cells


Answers (1)

best_answer
     
  • Stomata open and close as a result of osmosis.
  • Under hot and dry conditions, when water loss due to evaporation is high, stomata must close to prevent dehydration.
  • Guard cells actively pump potassium ions (K +) out of the guard cells and into surrounding cells. 
  • This causes water in the enlarged guard cells to move osmotically from an area of low solute concentration (guard cells) to an area of high solute concentration (surrounding cells). 
  • The loss of water in the guard cells causes them to shrink. This shrinkage closes the stomatal pore.
  • When conditions change such that stomata need to open, potassium ions are actively pumped back into the guard cells from the surrounding cells. 
  • Water moves osmotically into guard cells causing them to swell and curve.
  • The outer wall of guard cells bend outwards because it is thin and elastic.
  • The inner wall does not bend as it is thick and inelastic.
  • This bending of outer wall causes opening of stomatal pore.

Turgidity of the guard cells decide the opening of the stomatal pore. Hence, the correct answer is option a.

Posted by

vishal kumar

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