AQA GCSE BIOLOGY Higher Tier Paper 2H 2018.

Please write clearly in block capitals. Centre number Candidate number Surname Forename(s) Candidate signature GCSE BIOLOGY Higher Tier Paper 2H H A 2 *02* IB/G/Jun18/8461/2H Do not write outside the 0 1 Many human actions are reflexes. box 0 1 . 1 Which two of the following are examples of reflex actions? [2 marks] Tick two boxes. Jumping in the air to catch a ball Raising a hand to protect the eyes in bright light Releasing saliva when food enters the mouth Running away from danger Withdrawing the hand from a sharp object Figure 1 shows how the size of the pupil of the human eye can change by reflex action. Figure 1 0 1 . 2 Name one stimulus that would cause the pupil to change in size from A to B, as shown in Figure 1. [1 mark] 3 *03* Turn over ► IB/G/Jun18/8461/2H Do not write outside the 0 1 . 3 Structure Q causes the change in size of the pupil. box Name structure Q. [1 mark] 0 1 . 4 Describe how structure Q causes the change in the size of the pupil from A to B. [1 mark] Question 1 continues on the next page 4 *04* IB/G/Jun18/8461/2H Do not write outside the box 0 1 . 5 Figure 2 shows some structures involved in the coordination of a reflex action. Figure 2 Describe how the structures shown in Figure 2 help to coordinate a reflex action. [6 marks] 11 6 *06* IB/G/Jun18/8461/2H Do not write outside the box 0 2 Many scientists think that global air temperature is related to the concentration of carbon dioxide in the atmosphere. Figure 3 shows changes in global air temperature and changes in the concentration of carbon dioxide in the atmosphere. Figure 3 0 2 . 1 Complete Table 1. Use information from Figure 3. [2 marks] Choose answers from the box. You may use each answer once, more than once or not at all. constant decreasing increasing Table 1 1960 – – – 2015 Trend in carbon dioxide concentration Increasing Trend in air temperature