Use your knowledge of indoleacetic acid (IAA) to explain the growth curvature shown in Figure 1 - AQA - A-Level Biology - Question 3 - 2021 - Paper 2
Question 3
Use your knowledge of indoleacetic acid (IAA) to explain the growth curvature shown in Figure 1.
**Figure 1** shows an investigation into growth factors in plants. ... show full transcript
Worked Solution & Example Answer:Use your knowledge of indoleacetic acid (IAA) to explain the growth curvature shown in Figure 1 - AQA - A-Level Biology - Question 3 - 2021 - Paper 2
Step 1
Tip produces IAA
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Answer
The shoot tip is responsible for producing indoleacetic acid (IAA), which is a plant hormone that promotes cell elongation.
Step 2
IAA diffuses into shoot
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Answer
Once produced, IAA diffuses from the tip into the adjacent cells of the shoot, influencing their growth.
Step 3
Elongation of cells on one side
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Answer
In the experiment, by replacing the tip on one side of the cut shoot, the IAA concentration becomes uneven. The side with the tip receives more IAA, causing greater cell elongation on that side, leading to curvature towards that side.
