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.
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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 tip of the plant produces indoleacetic acid (IAA), which is essential for plant growth.
Step 2
IAA diffuses into shoot
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Answer
IAA produced in the shoot tip diffuses down the plant stem, promoting elongation of the cells.
Step 3
Elongation of cells on one side
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Answer
When the tip is placed on one side of the cut shoot, more IAA accumulates on that side which causes the cells on that side to elongate more than those on the opposite side, resulting in growth curvature toward the side opposite to where the IAA diffused.
