From the following groups, select the one which has only secondary metabolites?
(a) Arbin, cellulose, arginine, tyrosine
(b) Glycine, gums, serine, diterpenes
(c) Carotenoids, phenylalanine, curcumin, rubber
(d) Conclavin-A, morphine, codeine, vinblastine
(d) Secondary metabolites are derivates of primary metabolites which have no direct function in growth and development of plants. These compounds are accessory rather than central to the functioning, eg., arbin, cellulose, gums, diterpenes, carotenoids, curcumin, rubber etc. Arginine, tyrosine, glycine, serine and phenylalanine are amino acids, which are primary metabolites.