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B
Growth hormone released by fungal infection.
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C
Change in photoperiod
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D
Inadequate nutrients
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Solution
The correct option is A Growth hormone released by fungal infection.
Bakanae, from the Japanese for "foolish seedling", is a disease that infects the rice plant. It is caused by the fungus Gibberella fujikuroi, the metabolism of which produces a surplus of gibberellic acid (growth hormone).
So, the correct answer is 'Growth hormone released by a fungal infection'