Group-I Group-II (P) Codeine (1) Flavones (Q) Podophyllotoxin (2) Alkaloids (R) Resveratrol (3) Lignans (S) Linamarin (4) Monoterpenes (T) Limonene (5) Cyanogenic glycosides (6) Stilbenes
Secondary Metabolite Matching
This question requires matching secondary metabolites listed in Group I with their corresponding chemical classes from Group II.
Group I: Secondary Metabolites
- (P) Codeine
- (Q) Podophyllotoxin
- (R) Resveratrol
- (S) Linamarin
- (T) Limonene
Group II: Chemical Classes
- (1) Flavones
- (2) Alkaloids
- (3) Lignans
- (4) Monoterpenes
- (5) Cyanogenic glycosides
- (6) Stilbenes
Matching Explanation
Correctly identifying the class of each metabolite is key:
- Codeine (P) is a well-known psychoactive substance derived from the opium poppy, belonging to the Alkaloids (2) class.
- Podophyllotoxin (Q) is a complex organic compound derived from plants like Mayapple, classified as a Lignan (3).
- Resveratrol (R) is a stilbenoid naturally found in grapes and other plants, known for its antioxidant properties, hence it is a Stilbene (6).
- Linamarin (S) is found in cassava and flax seeds; it releases hydrogen cyanide upon hydrolysis and is classified as a Cyanogenic glycoside (5).
- Limonene (T) is a widely occurring cyclic terpene found in citrus fruit peels, belonging to the Monoterpenes (4) category.
| Group I Item | Metabolite | Group II Class | Chemical Class |
| (P) | Codeine | (2) | Alkaloids |
| (Q) | Podophyllotoxin | (3) | Lignans |
| (R) | Resveratrol | (6) | Stilbenes |
| (S) | Linamarin | (5) | Cyanogenic glycosides |
| (T) | Limonene | (4) | Monoterpenes |
This leads to the matching: P-2, Q-3, R-6, S-5, T-4.
Important Questions from Plant Biochemistry Secondary Metabolites
Identify the CORRECT statements in plant secondary metabolism.
P. Tropane alkaloids in Atropa belladonna are synthesized from tyrosine
Q. Antioxidative food ingredient rosmarinic acid is obtained from cell suspension cultures of Coleus blumei
R. Thiophenes are produced from hairy root cultures of Tagetes patula
S. Cyanidin, the principal anthocyanin responsible for red color in Rosa hybrida is produced from cinnamaldehyde
- Which of the following plant hormones is a carotenoid-cleavage product?
- Identify the INCORRECT statement with relation to plant secondary metabolites.
- Horseradish peroxidase and alkaline phosphatase are the two enzymes commonly utilized as reagents in ELISA, because these enzymes
- One of the defense mechanisms adopted by plants for detoxification of heavy metals is the synthesis of
