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Question

Which one of the following is a naturally occurring growth inhibitor?
  1. ABA
  2. IAA
  3. NAA
  4. GA

A
GA
B
IAA
C
ABA
D
NAA
Solution
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Abscisic acid is the plant growth hormone which is responsible for inhibiting growth. This is the natural growth inhibitor which is produced in the plants. The hormone causes inhibition in the growth of the roots and shoots. The hormone also causes abscission which is the falling of the leaves, fruits and flowers. The hormone suppresses all the processes in the plants during unfavourable conditions.
Thus, the correct answer is option D.

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