Gibberellins would cause a plant to grow taller. thus, option B is correct.
What is the role of plant hormone?
Plant hormones control practically every element of plant development and response to its surroundings. Many plant hormones play important roles in the interactions between plants and beneficial microorganisms because they are active at low concentrations and have tight spatial regulation of synthesis and response.
Gibberellins are plant growth regulators that help plants grow taller by facilitating cell elongation which makes plant grow taller. They're also important for germination, stem elongation, fruit ripening, and flowering.
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