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Question Video: Describing a Graph of the Effect of Gibberellin Concentration on Germination Biology

The graph provided shows the results of incubating seeds in different concentrations of gibberellin (GA). Which of the following best describes the trend shown? [A] As the concentration of GA increases, the percentage of seeds that germinate decreases. [B] As the concentration of GA increases, the percentage of seeds that germinate increases. [C] As the concentration of GA increases, there is no significant effect on the percentage of seeds germinating.

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Video Transcript

The graph provided shows the results of incubating seeds in different concentrations of gibberellin, GA. Which of the following best describes the trend shown? (A) As the concentration of GA increases, the percentage of seeds that germinate decreases. (B) As the concentration of GA increases, the percentage of seeds that germinate increases. Or (C) as the concentration of GA increases, there is no significant effect on the percentage of seeds germinating.

Most plant seeds are designed to withstand harsh environmental conditions, such as cold winters and periods without water. Seed dormancy is maintained by high concentrations of a hormone called abscisic acid, or ABA, which controls water uptake by the seed’s embryo tissues, allowing it to survive desiccation.

When the harsh environmental conditions have passed, ABA concentration in the seed decreases. This allows water to enter the seed’s embryo tissues. And at the same time, a hormone called gibberellin, sometimes known as gibberellic acid or GA, is secreted. GA breaks down the starchy food stores in the seed, allowing the embryonic plant to perform cellular respiration and synthesize proteins, stimulating germination and the plant’s first growth.

This is reflected in the graph provided by the question. As the concentration of GA increases, the percentage of seeds germinating also increases. This means that we have found the correct answer to this question. The answer choice that best describes the trend shown in the graph is (B). As the concentration of GA increases, the percentage of seeds that germinate increases.

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