MHT CET 202621 AprilEvening Shift
- Exam
- MHT CET
- Year
- 2026
- Date
- 21 April
- Shift
- Evening Shift
- Subject
- Biology
- Chapter
- Plant - Growth and Development
MHT CET 2026 · 21 April · Evening Shift · Biology · Plant - Growth and Development
Which of the following pair of plant hormones have mevalonic acid...
Which of the following pair of plant hormones have mevalonic acid as the precursor?
Options
- AAuxin and cytokinin
- BGibberellin and Abscisic acid
- CEthylene and Cytokinin
- DAuxin and Gibberellin
Correct answer
B. Gibberellin and Abscisic acid
Step-by-step solution
Plant growth regulators are small, simple molecules of diverse chemical composition.
Auxin (IAA) is an indole compound derived from the amino acid tryptophan.
Cytokinins are adenine derivatives (e.g., -furfurylamino purine).
Ethylene is a gaseous hormone derived from the amino acid methionine.
Gibberellins are terpenes, and Abscisic acid (ABA) is a derivative of carotenoids. Both terpenes and carotenoids are isoprenoids, which are synthesized via the mevalonic acid pathway. Therefore, both Gibberellin and Abscisic acid share mevalonic acid as their precursor.
Answer: Gibberellin and Abscisic acid
Auxin (IAA) is an indole compound derived from the amino acid tryptophan.
Cytokinins are adenine derivatives (e.g., -furfurylamino purine).
Ethylene is a gaseous hormone derived from the amino acid methionine.
Gibberellins are terpenes, and Abscisic acid (ABA) is a derivative of carotenoids. Both terpenes and carotenoids are isoprenoids, which are synthesized via the mevalonic acid pathway. Therefore, both Gibberellin and Abscisic acid share mevalonic acid as their precursor.
Answer: Gibberellin and Abscisic acid