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The growth of crop plants, such as wheat, can be improved by the use of fertilisers and the control of pests - Edexcel - GCSE Biology - Question 7 - 2023 - Paper 1
Question 7
The growth of crop plants, such as wheat, can be improved by the use of fertilisers and the control of pests. Figure 13 shows the mass of grains produced by wheat p... show full transcript
Worked Solution & Example Answer:The growth of crop plants, such as wheat, can be improved by the use of fertilisers and the control of pests - Edexcel - GCSE Biology - Question 7 - 2023 - Paper 1
Step 1
Step 2
Explain why farmers measure the mass of 1000 grains rather than the mass of one wheat grain.
Answer
The mass of single grains is very small, and may vary considerably. Therefore, measuring a sample of 1000 grains provides a more reliable average and allows for accurate comparisons between treatments.
Step 3
Step 4
Explain why biological control would be more successful when a crop is grown under a clear plastic cover.
Answer
The biological control agent is contained in the protected environment, preventing it from escaping and allowing it to more effectively find and destroy pests. This setup reduces crop damage and increases yield.
Step 5
Explain the advantages and disadvantages of growing GM corn plants.
Answer
Advantages include:
- Resistance to insects means less crop damage, leading to a larger yield.
- GM plants produce a toxin that kills specific insects, limiting harm to the environment.
- Less insecticide or pesticide is required, reducing costs in the long term.
Disadvantages include:
- GM seeds are typically more expensive.
- Genetic resistance could spread to wild plants, creating 'super weeds'.
- Potential reduction in biodiversity may affect ecosystems.
- Pests may evolve resistance to the GM traits over time, complicating future control efforts.