NEET 2026
- Exam
- NEET
- Year
- 2026
- Subject
- Biology
- Chapter
- Chapter
NEET 2026 · Biology · Chapter
Which of the following pairs of plant growth regulators consists...
Which of the following pairs of plant growth regulators consists exclusively of synthetic compounds?
Options
- AIAA and Zeatin
- BNAA and Kinetin
- CIBA and
- DABA and 2,4-D
Correct answer
B. NAA and Kinetin
Step-by-step solution
Plant growth regulators can be broadly classified into natural and synthetic compounds based on their occurrence.
IAA (Indole-3-acetic acid) and IBA (Indole-3-butyric acid) are natural auxins isolated from plants.
Zeatin is a natural cytokinin isolated from corn kernels and coconut milk.
(Gibberellic acid) and ABA (Abscisic acid) are also naturally occurring plant growth regulators.
NAA (Naphthaleneacetic acid) and 2,4-D (2,4-Dichlorophenoxyacetic acid) are synthetic auxins.
Kinetin is a modified form of adenine discovered from autoclaved herring sperm DNA and does not occur naturally in plants, making it a synthetic cytokinin.
Therefore, the pair consisting exclusively of synthetic compounds is NAA and Kinetin.
Answer: NAA and Kinetin
IAA (Indole-3-acetic acid) and IBA (Indole-3-butyric acid) are natural auxins isolated from plants.
Zeatin is a natural cytokinin isolated from corn kernels and coconut milk.
(Gibberellic acid) and ABA (Abscisic acid) are also naturally occurring plant growth regulators.
NAA (Naphthaleneacetic acid) and 2,4-D (2,4-Dichlorophenoxyacetic acid) are synthetic auxins.
Kinetin is a modified form of adenine discovered from autoclaved herring sperm DNA and does not occur naturally in plants, making it a synthetic cytokinin.
Therefore, the pair consisting exclusively of synthetic compounds is NAA and Kinetin.
Answer: NAA and Kinetin