DCPIP ( dichlorophenolindophenol) isa. Inhibitor of electron transportb. Herbicidec. Inhibitor of photosynthesisd. Blue coloured hill oxidant which becomes colourless on being reduced

The correct answer is:

d. Blue coloured hill oxidant which becomes colourless on being reduced

Explanation:

DCPIP (Dichlorophenolindophenol) is a synthetic dye used in biochemistry to study the electron transport chain, particularly in photosynthesis experiments. It serves as an artificial electron acceptor.

DCPIP is initially blue in color.
During the reduction process (as electrons are transferred to it), it loses its blue color and turns colorless. This change can be used to monitor the activity of photosynthetic reactions or electron transport in experiments.
It is not a herbicide, nor does it act as a direct inhibitor of photosynthesis, though it is involved in studying electron transport within photosynthetic systems.
Thus, the description of DCPIP as a "blue colored hill oxidant which becomes colourless on being reduced" is accurate.