Q. Through their effect on plant growth regulators, what do the temperature and light control in the plants?
A) Apical dominance
B) Flowering
C) Closure of stomata
D) Fruit elongation
Explanation
[Solution from source] Light (photoperiodism) and low temperature (vernalisation) both act through growth regulators to decide when a plant flowers. Stomatal closure is driven by ABA in response to water stress, not by photoperiod and temperature. Answer (2).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.