Read the following statements regarding secondary metabolites: A. Morphine and Codeine are alkaloids. B. Concanavalin A is a pigment. C. Ricin and abrin are toxins. D. Vinblastin and curcumin are polymeric substances. E. Rubber and gums are secondary metabolites. How many of the above statements are incorrect?

Step-by-step solution

Statement B is incorrect because Concanavalin A is a lectin, not a pigment. Pigments include carotenoids and anthocyanins. Statement D is incorrect because Vinblastin and curcumin are drugs. Polymeric substances include rubber, gums, and cellulose. Statements A, C, and E are correct as per the classification of secondary metabolites. Morphine and codeine are alkaloids, ricin and abrin are toxins, and rubber and gums are polymeric secondary metabolites. Therefore, exactly two statements (B and D) are incorrect. Answ