The correct option is (c). The height of a plant depends on growth hormones like auxins and gibberellins. Genes code for specific enzymes, which regulate hormone activity, thereby controlling the plant’s height and overall growth.
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The correct answer is (c) Growth hormones under the influence of the enzymes coded by a gene. The height of a plant is controlled by growth hormones like auxins and gibberellins. These hormones function under the regulation of enzymes coded by genes. Genes produce proteins and enzymes that influence hormone activity, thereby controlling growth patterns, elongation, and ultimately determining the height of the plant.