17. Inheritance
A section of Biology, 5090
Listing 10 of 245 questions
Similar crops were grown on the same farm over a five-year period. shows the effect on the number of insects present on the crops when an insecticide is used in each of the five years. time / years spraying of insecticide started insects present / % of original number State one way an insect might be helpful to the crops harmful to the crops. Explain why the percentage of insects began to rise in the second year until almost reaching its original level. Suggest three methods of improving the yield from the crops without the use of an insecticide. 1. 2. 3.
5090_w10_qp_22
THEORY
2010
Paper 2, Variant 2
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245