First slide
How to Analyse Chemical Composition
Question

Which of the following secondary metabolites are used as pigments?
(I) Carotenoids 
(II) Ricin
(III) Morphine
(IV) Anthocyanin
(V) Abrin.
(VI) Rubber

Moderate
Solution

Anthocyanin and carotenoids are secondary metabolites that impart colour (pigments) 

All others  given in the question are also secondary metabolites with roles such as drugs, toxins.  

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