Q. Which of the following is the effect of a plant hormone, which is synthesized more in the absence of light?
A) Inhibits the development of seedless fruits
B) Responsible for closing of stomata
C) Induces the dormancy of seeds
D) Length of internodes increases
Explanation
Gibberellins are the plants hormone causing light inhibited stem growth, this shows that light lowers the level of endogenous gibberellins and stem growth, while in drak it reverses. Gibberellins also produce some other physiological effects on plants like elongation of internodes and the stem, induce seed germination, breaking dormancy, induce perthenocarpy and maleness in plants, etc.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.