Please answer it with proper Explanation

Which of the following is a primary metabolite?
(1) Carotenoid
(2) Glucose
(3) Morphine
(4) Cellulose

Dear student,

Primary metabolite is directly involved in reproduction, normal growth and development and is involved in performing psychological function in an organism.
Among all these options glucose is a primary metabolite because it is found in various metabolic pathways.
Whereas Carotenoid, morphine and cellulose are secondary metabolites because these are not directly involved in growth and reproduction of an organism.

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