Which one of the following is a secondary metabolite produced by some

Which one of the following is a secondary metabolite produced by some plants?

Starch
Terpenoids
Malate
Sugar
This question was previously asked in
UPSC Geoscientist – 2023
The correct answer is Terpenoids.
Primary metabolites are directly involved in the normal growth, development, and reproduction of an organism. Examples include carbohydrates (like starch, sugar), lipids, proteins, nucleic acids, and simple organic acids (like malate). Secondary metabolites are not directly involved in these essential processes but often have ecological functions, such as defense against herbivores or pathogens, or attracting pollinators.
Terpenoids are a large class of organic compounds derived from five-carbon isoprene units. They are classic examples of secondary metabolites found in plants, known for diverse functions including fragrances, flavors, pigments, and defense compounds. Starch, malate, and sugar are primary metabolites essential for energy storage, metabolism, and transport in plants.
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