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20. Human influences on ecosystems
A section of Biology, 0610
Listing 10 of 393 questions
The box on the left contains the phrase ‘intensive livestock farming’. The boxes on the right contain some sentence endings. Draw two lines from the box on the left to make two correct sentences. conditions increase the risk of the spread of disease. enables natural selection to take place. Intensive livestock farming involves keeping livestock in their natural environment. results in lots of animal waste which can pollute water. Intensive farming produces large volumes of greenhouse gases. State two greenhouses gases produced by intensive farming. State one effect of the pollution caused by greenhouse gases.
0610_m20_qp_32
THEORY
2020
Paper 3, Variant 2
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For Examiner's Use The table shows the area of tropical forests in some parts of the world and the rate of their destruction during the period 1990 – 2000. region of the world area of forest in 2000 / km2 area destroyed each year 1990 – 2000 / km2 annual percentage rate of destruction A 697 000 13 000 1.8 B 1 389 000 18 000 1.3 C 2 154 000 15 000 0.7 D 117 000 2 000 1.7 E 434 000 12 000 2.8 F 8 399 000 84 000 1.0 State which region had the greatest area of forest destroyed each year. State which region had the highest annual percentage rate of destruction. Use the data to suggest what the area of tropical forest in Region F will be in 2100. Predict which region will have the smallest area of forest in the year 2010. Tropical forests produce a large mass of dead vegetation each year which is decomposed. Name one type of microorganism that decomposes this dead plant matter. Name two substances that are released during decomposition that benefit the plants in the forest. For Examiner's Use Tropical forest is often cleared to provide ground for crop growth. However, after about three years, this land has to be abandoned and a new area is cleared. Suggest why a new area is needed after about three years of crop growing.
0610_s07_qp_2
THEORY
2007
Paper 2, Variant 0
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For Examiner's Use Modern technology can be used to increase the yield of crops. The use of chemicals, such as fertilisers, herbicides and pesticides, is one of the developments used. Name two mineral ions commonly included in fertilisers. 1. 2. Explain the dangers to the local environment of the overuse of fertilisers on farmland. Suggest how the use of herbicides can be of benefit to crop plants. Suggest two dangers of using pesticides on farmland. 1. 2. For Examiner's Use Artificial selection and genetic engineering can also be used to increase crop yields. Explain the difference between these two techniques.
0610_s09_qp_2
THEORY
2009
Paper 2, Variant 0
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Questions Discovered
393