Question

compate the pH of guard cells during opening and closing of stomata.

Answer 1

Stomata remain closed during night when there is no photosynthesis and due to accumulation of carbon-dioxide, carbonic acid is formed that causes the pH to be acidic. Thus, stomatal movement is regulated by pH due to inter-conversion of starch and sugar.
when there is photosynthesis means at day time. when it is open that time ph is basic

more info -
Stomatal opening in the species used varies with two factors — 1. the actual pH of the fluid in which epidermal slivers are immersed, and 2. the kind of buffer substance used. The following four points will highlight the four important theories of stomatal movement.

The four important theories of stomatal movement are: (1) Theory of Photosynthesis in Guard Cells (2) Starch Sugar Inter-conversion Theory (3) Theory of Glycolate Metabolism and (4) Active K+Transport or Potassium Pump Theory and Role of Abscisic Acid or Active Potassium Pump Theory.


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Answer 2

Answer:

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1. The pH of guard cells increases during opening of stomata.
2. The pH of guard cells decreases during closing of stomata.