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Which one of ...

Question

Which one of the following hormones causes dwarf bean plants to grow tall? (1 mark)

A. Auxin
B. Gibberellin
C. Cytokinin
D. Ethylene

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Solution

The correct answer is option B.
Gibberellins are growth hormones that stimulate cell elongation and cause plants to grow taller. So, if dwarf beans are treated with a dose of gibberellins, they can grow to the same height as the tall varieties.

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