Plant Growth and Development Question 34
34. Cell elongation in internodal regions of the green plants takes place due to
(a) indole acetic acid
(b) cytokinins
(c) gibberellins
(d) ethylene
Show Answer
Answer : c
Hints & Solutions
(c) Gibberellins induces elongation of internodes. Some of the major physiological effects of gibberellins are as follows: Gibberellins are weakly acidic growth hormones having gibbane ring structure which cause cell elongation of intact plants in general and increased internodal length of genetically dwarfed plants (e.g., Pea, Corn), in particular.
