Discussion
Which of the following is/are NOT a secondary metabolite?
Answer: C
Starch is not a secondary metabolite: it is a primary metabolite, a storage carbohydrate made in basic metabolism. Alkaloids, glycosides and steroids are secondary metabolites, which are not needed for basic growth.
Primary metabolites such as sugars, starch, amino acids and fats are needed for growth, and secondary metabolites such as alkaloids, glycosides, steroids and terpenes serve defence and other roles. Starch is a storage carbohydrate and so a primary product.
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