A) cytokinin
B) ethylene
C) abscisic acid
D) gibberellins
Correct Answer: D
Solution :
Gibberellins stimulates stem elongation and leaf expansion but not affect roots. Gibberellin restore normal size and growth to genetically dwarf varieties of pear and maize. It is believed that certain specific types of dwarfness in plants are due to deficiency of gibberellin.
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