(a) A farmer wants to choose an area, A or B, to plant vegetables. He takes a sample of the top soil from each area to a soil-testing laboratory. The results of the soil composition tests are shown in Figure 2. (ii) (i) Humus Water Clay Silt Fine sand Coarse sand Gravel 1000 B Figure 2. Results of soil composition tests Water Clay Fine sand Coarse sand Gravel Based on the results presented in Figure 2, suggest which area would be more suitable for the farmer to plant vegetables. Give ONE reason to support your answer. (2 marks) Using the following list of apparatus and materials, outline the procedure for obtaining the results presented in Figure 2. Two large measuring cylinders; stirring rod; soil samples in petri dishes; a beaker of water; balance (2 marks) (c) (iv) The soil samples are brought to the laboratory in a black bag. When the samples are poured out onto a tray, some small insects crawl quickly back into the soil. Write a hypothesis for this observation. Figure 4 shows a food web of soil organisms in a terrestrial ecosystem. Sun Organic matter Arthropods (2 marks) Birds Arthropods Nematodes Fungi Animals Figure 4. Food web in a terrestrial ecosystem Suggest how the population of fungi and the arthropods would be affected if all the nematodes were killed by a pesticide. Give a reason for your answer. Fungi Arthropods (2 marks) Total 20 marks
(a) A farmer wants to choose an area, A or B, to plant vegetables. He takes a sample of the top soil from each area to a soil-testing laboratory. The results of the soil composition tests are shown in Figure 2. (ii) (i) Humus Water Clay Silt Fine sand Coarse sand Gravel 1000 B Figure 2. Results of soil composition tests Water Clay Fine sand Coarse sand Gravel Based on the results presented in Figure 2, suggest which area would be more suitable for the farmer to plant vegetables. Give ONE reason to support your answer. (2 marks) Using the following list of apparatus and materials, outline the procedure for obtaining the results presented in Figure 2. Two large measuring cylinders; stirring rod; soil samples in petri dishes; a beaker of water; balance (2 marks) (c) (iv) The soil samples are brought to the laboratory in a black bag. When the samples are poured out onto a tray, some small insects crawl quickly back into the soil. Write a hypothesis for this observation. Figure 4 shows a food web of soil organisms in a terrestrial ecosystem. Sun Organic matter Arthropods (2 marks) Birds Arthropods Nematodes Fungi Animals Figure 4. Food web in a terrestrial ecosystem Suggest how the population of fungi and the arthropods would be affected if all the nematodes were killed by a pesticide. Give a reason for your answer. Fungi Arthropods (2 marks) Total 20 marks
Chapter13: Aquatic Structures And Equipment
Section: Chapter Questions
Problem 2KA
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Transcribed Image Text:(a)
A farmer wants to choose an area, A or B, to plant vegetables. He takes a sample of the
top soil from each area to a soil-testing laboratory. The results of the soil composition
tests are shown in Figure 2.
(ii)
(i)
Humus
Water
Clay
Silt
Fine sand
Coarse sand
Gravel
1000
B
Figure 2. Results of soil composition tests
Water
Clay
Fine sand
Coarse sand
Gravel
Based on the results presented in Figure 2, suggest which area would be more
suitable for the farmer to plant vegetables. Give ONE reason to support your
answer.
(2 marks)
Using the following list of apparatus and materials, outline the procedure for
obtaining the results presented in Figure 2.
Two large measuring cylinders; stirring rod; soil samples in petri dishes; a beaker
of water; balance
(2 marks)
Transcribed Image Text:(c)
(iv)
The soil samples are brought to the laboratory in a black bag. When the samples
are poured out onto a tray, some small insects crawl quickly back into the soil.
Write a hypothesis for this observation.
Figure 4 shows a food web of soil organisms in a terrestrial ecosystem.
Sun
Organic matter
Arthropods
(2 marks)
Birds
Arthropods
Nematodes
Fungi
Animals
Figure 4. Food web in a terrestrial ecosystem
Suggest how the population of fungi and the arthropods would be affected if all the
nematodes were killed by a pesticide. Give a reason for your answer.
Fungi
Arthropods
(2 marks)
Total 20 marks
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