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.