Question

Which of the following are not secondary metabolites in plants?

• A. Rubber, gums
• B. Morphine, codeine
• C. Amino acids, glucose
• D. Vinblastin, curcumin

Answer 1

The Correct Option is C

To solve this question, we need to understand the concept of secondary metabolites in plants. Secondary metabolites are organic compounds that are not directly involved in the normal growth, development, or reproduction of organisms. They are often involved in plant defense against herbivores and pathogens and can also play a role in plant-plant interactions.

Let's evaluate each option to see which includes compounds that are not secondary metabolites:

1. Rubber, gums - These substances are considered secondary metabolites. They are produced by plants in response to injury or as a defense mechanism against herbivores.
2. Morphine, codeine - Both of these are alkaloids, which are classic examples of secondary metabolites in plants. They occur naturally in the opium poppy and serve as a defense mechanism.
3. Amino acids, glucose - Amino acids and glucose are primary metabolites. They are essential for basic growth functions, such as protein synthesis and respiration, and serve as building blocks for essential life processes. Therefore, this option includes compounds that are not secondary metabolites.
4. Vinblastin, curcumin – These are secondary metabolites. Vinblastin is an alkaloid, and curcumin is a polyphenolic compound, both serving as defense compounds in plants.

Based on this analysis, the correct answer is that amino acids and glucose are not secondary metabolites; they are primary metabolites, which are directly involved in the growth and metabolic processes in plants.