GCSE OCR Combined Science A Papers 1 and 7

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OCR Combined Science A Papers 1 and 7

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OCR Combined Science A Papers 1 and 7

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#1. Which of the following are 3 of the adaptations of leaves for efficient photosynthesis?

Select all that apply:

Remember to carefully read the question, if you selected Root hair cells, you were mistaken because the question asked about leaves, not roots.

#2. How do substances typically move into and out of the body, for example, oxygen in the lungs? ? 1 word answer

#3. What is the resolution of electron microscopes limited by?

#4. What is an active site?

#5. Multicellular organisms are too large to allow diffusion through their cells to provide the necessary resources. Instead we have transport systems. What is the name of the transport system that uses capillaries to transport substances via the blood?

#6. Through which process do nutrients enter root hair cells from the soil?

#7. The respiratory system relies on diffusion of oxygen and carbon dioxide. Which of the following statements are correct?

Select all that apply:

#8. Which of the following are the 4 factors that affect the rate of photosynthesis?

Select all that apply:

#9. Which of these is an effector?

#10. What are cilia?

#11. What is the role of protease?

#12. What is the function of white blood cells?

#13. What is stroke volume?

#14. Is osmosis an active or a passive process?

#15. What is the molecular formula for glucose?

#16. What is the role of the nucleus?

#17. What is the word equation for photosynthesis? ? In some examples you might also see sunlight and chlorophyll above and below the arrow.

#18. In active transport – are particles travelling with or against the concentration gradient?

#19. What is the balanced chemical equation for photosynthesis?

#20. What is stroke volume measured in?

#21. In which sub-cellular structure inside plant cells does photosynthesis occur?

#22. Which description most accurately describes osmosis?

#23. What is the function of platelets?

#24. When is adrenaline released?

#25. What is the role of the inferior vena cava?

#26. What is the equation for magnification?

There are two equations for magnification, both tell you how many times larger the image appears than it actually is.

One equation links the magnification of the two lenses and the other equation links magnification to the size of the object and image.

#27. Which of these is an effector?

#28. Increases in thyroxine concentration in the blood cause a decrease in the amount of thyroxine released. What kind of feedback mechanism is this?

#29. The left ventricle has a thicker muscle wall, why is this the case?

#30. What is the role of effectors?

#31. Name one hormone that is produced in the pancreas?

#32. Which of the following features are found in arteries?

#33. Anaerobic respiration does not involve oxygen. Select the correct word equation for anaerobic respiration.

#34. In which part of the cell does anaerobic respiration take place?

#35. What is enzyme specificity?

#36. Surfaces where diffusion takes place allowing substances to enter the body usually have which characteristics?

Select all that apply:

#37. What is the gap between neurones called?

#38. Which type of white blood cells produce antibodies that stick to the antigens of pathogens?

#39. What are two systems which allow your body to respond to its surroundings?

Select all that apply:

#40. What is the process by which organisms remove waste from their bodies?

#41. Resting metabolic rate is measured under which of the following conditions?

Select all that apply:

#42. What are substrates?

#43. Which of the following is part of the central nervous system (CNS)?

Heart Diagram missing right atrium

#44. What is the part of the heart that the arrows are pointing to?

#45. Which sub-cellular structures can be found in animals?

Select all that apply:

#46. During exercise, your cells require more oxygen and glucose. What changes in the body happen during exercise to meet these increased needs?

Select all that apply:

#47. When an impulse reaches an axon terminal what happens?

#48. Why is catalysis by enzymes important for life processes?

#49. In diffusion – are particles travelling with or against the concentration gradient?

#50. How many chambers does the heart have?

#51. In what part of the cells does aerobic respiration take place?

#52. The drug called Digitalis slows the heart rate. Where does the drug come from?

#53. Motor neurones carry impulses to which part of the nervous system?

#54. Which process in the body produces carbon dioxide?

#55. What is the difference between aerobic and anaerobic respiration?

#56. Cells are adapted to perform a specific function. Why do cells in the pancreas have lots of ribosomes?

#57. Is active transport an active or a passive process?

#58. What is meant by an active process?

#59. How are cells that line the small intestine specialised?

#60. Through which process would air freshener sprayed in one corner of a room disperse?

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