A) \[IAA\]
B) \[ABA\]
C) \[G{{A}_{3}}\]
D) \[{{C}_{2}}{{H}_{4}}\]
Correct Answer: D
Solution :
It was a Russian physiologist named Dimitry N Neljubow ( 1876-1926), who first established that ethylene affects plant growth. He identified ethylene in illuminating gas and showed that it causes a triple response on pea seedlings-inhibited stem elongation, increased stem thickening and a horizontal growth habit.
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