Identifying Synthetic Auxin and Cytokinin Analogues
Plant hormones, like auxins and cytokinins, regulate various growth processes. Some are naturally occurring, while others are synthetic analogues used in agriculture and research. The question asks to identify the option containing *only* synthetic versions of these hormones.
Understanding Auxin and Cytokinin Types
- Auxins: Natural auxin is Indole-3-acetic acid (IAA). A common synthetic auxin is 2,4-Dichlorophenoxyacetic acid (2,4-D).
- Cytokinins: Natural cytokinin is Zeatin. A well-known synthetic cytokinin is Kinetin.
Evaluating the Options
We need to check each pair to ensure both are synthetic analogues:
- Option 1: IAA and Kinetin - IAA is natural auxin; Kinetin is synthetic cytokinin. Incorrect.
- Option 2: 2, 4-D and Zeatin - 2,4-D is synthetic auxin; Zeatin is natural cytokinin. Incorrect.
- Option 3: IAA and Zeatin - IAA is natural auxin; Zeatin is natural cytokinin. Incorrect.
- Option 4: 2, 4-D and Kinetin - 2,4-D is synthetic auxin; Kinetin is synthetic cytokinin. Correct.
Summary Table
| Hormone Pair | Auxin Type | Cytokinin Type | Both Synthetic? |
|---|---|---|---|
| IAA and Kinetin | Natural (IAA) | Synthetic (Kinetin) | No |
| 2, 4-D and Zeatin | Synthetic (2, 4-D) | Natural (Zeatin) | No |
| IAA and Zeatin | Natural (IAA) | Natural (Zeatin) | No |
| 2, 4-D and Kinetin | Synthetic (2, 4-D) | Synthetic (Kinetin) | Yes |
Conclusion
The set comprising only synthetic analogues of auxin and cytokinin is 2, 4-D and Kinetin.
Important Questions from Plant Biochemistry Secondary Metabolites
- Correctly match the following secondary metabolites in Group-I with their chemical classes in Group-II.
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 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
