Question

Enzyme phosphorylase is first of all discovered in guard cells by

• A. Yin and Tung
• B. Noggle
• C. Scarth
• D. All of the above

Answer 1

The correct option is A Yin and Tung

Yin and Tung in 1948 isolated the enzyme phosphorylase for the first time from the guard cells. This enzyme catalyzes the conversion of starch into glucose 1 phosphate using inorganic phosphate. In this process, light and dark phases control the pH fluctuations.

Stomata are close when starch is present and open when glucose 1 phosphate is present.