Question

Who proposed that opening and closing of stomata is connected with the change in pH of guard cells?

• A. Lloyd
• B. Von Mohl
• C. Sayre
• D. Levitt

Answer 1

The correct option is C Sayre

Botanist Sayre observed that stomatal opening is connected to change in ph of guard cells due to carbon dioxide.

Stomata open in neutral and alkaline pH which is present in the daytime when carbon dioxide is constantly used.

In acidic condition, stomata remain closed which is present in night time when no photosynthesis occurs due to which accumulation of carbon dioxide occurs that results in the formation of carbonic acid. Thus guard cells movement is regulated by pH due to interconversion of starch and sugar.

So the correct answer is 'Sayre'.