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GCSE OCR Biology A Papers 2 and 4
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#1. What do we call animals that are eaten by other animals?
#2. What does abundance measure?
#3. In mutualistic feeding relationships – which organisms benefit?
#4. True or false – carbon dioxide is removed from the atmosphere as it dissolves in the oceans?
#5. How do we describe the periodic changes in population size of predators and prey – explained by increases in numbers of predators due to increased numbers of prey and then decreasing numbers of prey due to increasing numbers of predators and so on?
#6. Respiration from animals is a source of carbon dioxide in the atmosphere – do plants also use respiration?
#7. Which type of factor is soil composition?
#8. Which of these is a habitat?
#9. Which of the following is the correct word equation for aerobic respiration?
#10. Decomposers break down dead animal and plant material – what happens to the carbon inside the dead organisms?
#11. What are biotic factors?
#12. Where does the water in lakes and rivers end up?
#13. How much of the atmosphere is composed of nitrogen?
#14. Which of the following are strategies organisms use to adapt to changing abiotic conditions?
Select all that apply:
#15. If grass is eaten by a rabbit and a rabbit is eaten by a hawk. What level of consumer is the hawk?
#16. How do most plants get their nitrogen?
#17. Sometimes it is not possible to measure the number of organisms in a transect, for example when measuring the distribution of plants. In this case we use an alternative measure called what?
#18. What is groundwater?
#19. In some areas where there are poor soils (not enough nitrogen) carnivorous plants have adapted to get their nitrogen from which source?
#20. Why can humans only survive a few days without water?
#21. In a scientific investigation, you and two others randomly sample a rocky shore using quadrats. You find that on average there are 2 crabs per quadrat and the whole shore would be covered by 150 quadrats. Estimate how many crabs are on the whole shore.
#22. Match the description to the correct term. All of the individuals of a species that live in a particular woodland.
#23. Which of the following organisms belong to the kingdom – animals?
Select all that apply:
#24. What is a parasite?
#25. Complete the equation used to calculate population size: population size = ………….. x total size of it habitat / total area of quadrats
#26. Why do we use systematic or random sampling of an area to determine the distribution or abundance of organisms?
#27. What groups of organisms belong to the domain – eukaryotes? ? Eukaryotes have a membrane bound nucleus
Select all that apply:
#28. Where are nitrogen-fixing bacteria found in plants such as peas and beans?
#29. Which of these processes allows saltwater to become potable?
#30. Which of the following is the source of oil and gas?
#31. Match the description to the correct term. All of the organisms that live in a particular pond.
#32. Which organisms maintain the nitrogen levels in the soil?
#33. Why do plants need nitrogen?
#34. The binomial name for tigers is Felis tigris. Which part of the name represents the genus?
#35. By which process does water in the oceans and lakes move into the atmosphere?
#36. Which type of factor is nutrient availability?
#37. Who invented the binomial naming system?
Uh oh, maybe you need some lessons!
#38. What are nitrogen-fixing bacteria?
#39. Which of these is an example of a mutualistic relationship? 1) An insect and a flower 2) A vampire bat and a cow 3) A tick and a dog
#40. Which of these substances is sometimes added to water to make it potable?
#41. Is this relationship parasitic or mutualistic? A coral polyp (providing shelter) and single-celled algae (providing food)
#42. The water cycle has one part where water is in solid form – what is that form of storage?
#43. In parasitic feeding relationships there are two elements – what are they?
#44. We sometimes use a transect to perform systematic sampling. This involves which of the following?
#45. Finish the sentence: Nitrogen compounds found in artificial fertilisers are ……… and dissolve in the soil’s water.
#46. By which process does water in the clouds move onto land?
#47. Which square instrument do we use for randomly sampling population sizes?
#48. Why do plants need oxygen?
#49. What do we mean by the distribution of organisms?
#50. Which term do we use to describe the relationships between species that depend on each other for resources?
#51. Nitrogen is often found in a particular form in the soil what is this form?
#52. Which of the following is the source of coal?
#53. True or false – volcanism removes carbon from the atmosphere
#54. True or false – plants remove carbon from the atmosphere during photosynthesis
#55. Which of these is a community?
#56. What is the binomial name for humans?
#57. Which of the following can we use to investigate the effect of abiotic factors on the distribution of organisms?
#58. Which of these is an ecosystem?
#59. Name two resources that both animals and plants need to survive and reproduce? ? structure your answer like this: ..... and .....
#60. What are abiotic factors?
#61. Which of the following plants have a mutualistic relationship with nitrogen-fixing bacteria?
Select all that apply:
#62. Is the following statement accurate? Lightning can cause atmospheric nitrogen to be released into the rain and be washed into the soil?
#63. When fossil fuels are burned they release carbon into the atmosphere – which of the following are fossil fuels?
#64. Is the following statement accurate: nitrogen be can be moved back and forth from the atmosphere and into the soil by bacteria.
#65. How does nitrogen in plants get into the soil?
#66. Which type of factor is disease?
#67. What do we call animals that only eat plants?
#68. What natural source of nitrogen is sometimes added to fields by farmers?
#69. Which type of factor is air temperature?
#70. What is potable water?
#71. By which process does water in the atmosphere become part of clouds?
#72. Which type of factor is parasitism?
#73. How can parasites affect the nutrition of their hosts?
#74. How can we increase the accuracy of abundance estimates?
#75. What is the correct order of groups in the Linnaean Classification system?
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#76. Predators are essential for healthy ecosystems – what happens if predators are removed due to extinction?
#77. The 5 kingdoms of life are Animals, Plants, Fungi, Protists and Prokaryotes. Which kingdom do algae belong to?
#78. Which type of factor is water availability?
#79. What are the three domains?
#80. Why is the binomial naming system useful for scientists?
#81. Which type of factor is pollution?
#82. Is this relationship parasitic or mutualistic? A crocodile which lets a small bird feed on leftover meat between its teeth
#83. Which are the two kinds of sampling we normally use?
Select all that apply: