Plant Growth and Development Question 39
39. Dwarfness can be controlled by treating the plant with
[1992, 2002]
(a) cytokinin
(b) gibberellic acid
(c) auxin
(d) antigibberellin
Show Answer
Answer : b
Hints & Solutions
(b) One of the most important effects of gibberellins is the reversal of dwarfism (even in genetically dwarf plants). Dwarf pea & dwarf corn attain almost normal size when treated with gibberellins. It has been proven that dwarf plants have lower level of GA which causes the dwarfism. Thus the external supply causes rapid elongation of internodes. GA does not have any effect on elongation of normal (non dwarf or tall) plant.
