GCSE OCR Combined Science A Papers 2 and 8

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OCR Combined Science A Papers 2 and 8

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OCR Combined Science A Papers 2 and 8

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#1. Which of these processes allows saltwater to become potable?

#2. Which of these is a population?

#3. Is this relationship parasitic or mutualistic? A crocodile which lets a small bird feed on leftover meat between its teeth

#4. Producers are organisms which do what?

#5. Match the description to the correct term. All of the individuals of a species that live in a particular woodland.

#6. Why can humans only survive a few days without water?

#7. Respiration from animals is a source of carbon dioxide in the atmosphere – do plants also use respiration?

#8. Predators are essential for healthy ecosystems – what happens if predators are removed due to extinction?

#9. The water cycle has one part where water is in solid form – what is that form of storage?

#10. In mutualistic feeding relationships – which organisms benefit?

#11. Which of the following are strategies organisms use to adapt to changing abiotic conditions?

Select all that apply:

#12. Decomposers break down dead animal and plant material – what happens to the carbon inside the dead organisms?

#13. 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.

#14. Finish the sentence: Nitrogen compounds found in artificial fertilisers are ……… and dissolve in the soil’s water.

#15. Where are nitrogen-fixing bacteria found in plants such as peas and beans?

#16. Tapeworms and ticks are examples of parasites – which of these lives inside another organism?

#17. Name two resources that both animals and plants need to survive and reproduce? ? structure your answer like this: ..... and .....

#18. By which process does water in the clouds move onto land?

#19. Where does the water in lakes and rivers end up?

#20. True or false – volcanism removes carbon from the atmosphere

#21. Why do we use systematic or random sampling of an area to determine the distribution or abundance of organisms?

#22. What do we call the process by which farmers change the crops they grow each year to maintain nitrogen in the soil?

#23. The 5 kingdoms of life are Animals, Plants, Fungi, Protists and Prokaryotes. Which kingdom do algae belong to?

#24. Which of these is an ecosystem?

#25. How can parasites affect the nutrition of their hosts?

#26. What are the three domains?

#27. How do most plants get their nitrogen?

#28. Which type of factor is nutrient availability?

#29. Why do plants need nitrogen?

#30. What do we call animals that only eat plants?

#31. What do we call animals that are eaten by other animals?

#32. True or false – plants remove carbon from the atmosphere during photosynthesis

#33. In typical feeding relationships there are two elements – what are they?

#34. Which of these substances is sometimes added to water to make it potable?

#35. Is the following statement accurate: nitrogen be can be moved back and forth from the atmosphere and into the soil by bacteria.

#36. What are abiotic factors?

#37. Which of the following is the source of oil and gas?

#38. Which type of factor is competition?

#39. What is the binomial name for humans?

#40. What is a parasite?

#41. What groups of organisms belong to the domain – eukaryotes? ? Eukaryotes have a membrane bound nucleus

Select all that apply:

#42. What are nitrogen-fixing bacteria?

#43. If grass is eaten by a rabbit and a rabbit is eaten by a hawk. What level of consumer is the hawk?

#44. Which square instrument do we use for randomly sampling population sizes?

#45. The binomial name for tigers is Felis tigris. Which part of the name represents the genus?

#46. What does abundance measure?

#47. What is groundwater?

#48. Why do plants need oxygen?

#49. Which of the following plants have a mutualistic relationship with nitrogen-fixing bacteria?

Select all that apply:

#50. Which of the following is the source of coal?

#51. Which of these is an example of a parasitic relationship? 1) An insect and a flower 2) A vampire bat and a cow 3) A coral polyp and single-celled algae

#52. Is this relationship parasitic or mutualistic? A coral polyp (providing shelter) and single-celled algae (providing food)

#53. Which type of factor is pollution?

#54. We sometimes use a transect to perform systematic sampling. This involves which of the following?

#55. Which of the following is the correct word equation for aerobic respiration?

#56. Which type of factor is disease?

#57. Which type of factor is parasitism?

#58. When fossil fuels are burned they release carbon into the atmosphere – which of the following are fossil fuels?

#59. 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

#60. 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?

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