NEETBotanyPlant - Growth and Development
A plant hormone 'X' promotes rapid internode and petiole elongation in deep water rice plants. Which of the following statements correctly describes the chemical nature of hormone 'X'?
Options
- AIt is an indole compound.
- BIt is a terpene derivative.
- CIt is an adenine derivative.
- DIt is a simple gaseous plant growth regulator.
Correct answer
D. It is a simple gaseous plant growth regulator.
Step-by-step solution
The plant hormone 'X' is Ethylene, as it promotes rapid internode and petiole elongation in deep water rice plants. According to NCERT, ethylene is a simple gaseous plant growth regulator (PGR). The other options represent different categories of PGRs: Indole compounds refer to auxins (e.g., IAA). Terpene derivatives refer to gibberellins (e.g., GA3). Adenine derivatives refer to cytokinins (e.g., kinetin). Answer: It is a simple gaseous plant growth regulator.