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Farmers can spray seeds with gibberellins to start germination - AQA - GCSE Biology - Question 3 - 2020 - Paper 1
Question 3
Farmers can spray seeds with gibberellins to start germination. What are two other uses of gibberellins? Tick (✓) two boxes. - To help in tissue culture - To help... show full transcript
Worked Solution & Example Answer:Farmers can spray seeds with gibberellins to start germination - AQA - GCSE Biology - Question 3 - 2020 - Paper 1
Step 1
What are two other uses of gibberellins?
Answer
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To increase fruit size: Gibberellins are known to enhance the size of fruits by promoting cell elongation and loosening cell walls.
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To promote flower production: They play a vital role in stimulating the flowering process in certain plants, ensuring a successful reproductive cycle.
Step 2
Describe two improvements the students should make to their investigation.
Answer
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Use equal numbers of seedlings in each dish: This will ensure that the experiment is fair and any differences in growth can be attributed to light intensity rather than variations in seedling numbers.
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Measure light intensity: Having a consistent method for measuring light intensity, such as using a light meter, will help provide accurate and reliable data for comparison.
Step 3
Step 4
Explain what happened to the growth of the seedling on side Q compared with the growth on side P.
Answer
The seedling on side Q received less light compared to side P, resulting in slower growth. As plants grow towards light due to a hormone called auxin, the lack of light on side Q led to an unequal distribution of auxins, causing the cells on side P to elongate more, while those on side Q grew less. Thus, side Q exhibited stunted growth due to the limited light availability.