Question

Hill reaction occurs in

• A. high altitude plants
• B. absence of water
• C. total darkness
• D. presence of ferricyanide

Answer 1

The correct option is D presence of ferricyanide

Hill reaction
The Hill reaction is a phenomena in which the hydrogen ion of water reduces a final electron acceptor in presence of light. The physiological electron acceptor in living system is NADP+ that gets reduced to NADPH.
Robin Hill, in his experiment to show this, had used non-physiological reagents known as ‘Hill reagents’ such as ferricyanide. Ferricyanide gets reduced by the hydrogen produced from the photolysis of water.

Final answer:
(d) presence of ferricyanide