Indian rhubarb shows fluorescence under UV light. Which colour is it?
A
Orange
B
Green
C
Violet
D
Blue
Correct Option:
C
Explanation
Indian rhubarb characteristically exhibits deep violet fluorescence under ultraviolet light. Fluorescence is useful in pharmacognosy because related plant drugs and adulterants can look very similar macroscopically but display distinctly different fluorescence characteristics under UV illumination.
