Question

Mark the most appropriate answer in the following:
Stomata open during day and close at night because:

Options

• Photosynthesis occurs during day time only

• Enzymes convert starch into sugar at elevated pH in night

• Loss of sugar increases osmotic concentration of the cell sap

• Loss of starch in day time raises OP of subsidiary cells

Answer 1

Enzymes convert starch into sugar at elevated pH in night