AQA GCSE BIOLOGY Higher Tier Paper 1H 2020.

Please write clearly in block capitals. Centre number Candidate number Surname Forename(s) Candidate signature I declare this is my own work. GCSE BIOLOGY Higher Tier Paper 1H H 2 *02* IB/M/Jun20/8461/1H Answer all questions in the spaces provided. 0 1 This question is about photosynthesis. 0 1 . 1 Complete the word equation for photosynthesis. [2 marks] + → + oxygen 0 1 . 2 Describe how energy for the photosynthesis reaction is gained by plants. [2 marks] Students investigated the effect of temperature on the rate of photosynthesis. The students shone light from a lamp onto pondweed and measured the volume of oxygen produced per hour. Table 1 shows the results. Table 1 Temperature in °C Rate of photosynthesis in cm3 /hour Test 1 Test 2 Test 3 Mean 20 18.5 19.3 19.5 X 25 32.6 34.1 32.9 33.2 30 41.9 45.2 44.9 44.0 35 38.6 39.8 44.0 40.8 40 23.1 20.5 22.4 22.0 45 1.9 14.2 2.2 2.1 Do not write outside the box 3 *03* Turn over ► IB/M/Jun20/8461/1H Do not write outside the box 0 1 . 3 Calculate mean value X. [2 marks] X = cm3 /hour The students identified one anomalous result in Table 1. 0 1 . 4 Draw a ring around the anomalous result in Table 1. [1 mark] 0 1 . 5 Suggest one possible cause of the anomalous result. [1 mark] 0 1 . 6 How did the students deal with the anomalous result? [1 mark] 0 1 . 7 Give one factor the students should have kept constant in this investigation. [1 mark] 4 *04* IB/M/Jun20/8461/1H Do not write outside the box Table 1 is repeated below. Table 1 Temperature in °C Rate of photosynthesis in cm3 /hour Test 1 Test 2 Test 3 Mean 20 18.5 19.3 19.5 X 25 32.6 34.1 32.9 33.2 30 41.9 45.2 44.9 44.0 35 38.6 39.8 44.0 40.8 40 23.1 20.5 22.4 22.0 45 1.9 14.2 2.2 2.1 0 1 . 8 Why did the rate of photosynthesis decrease from 35 °C to 45 °C? [1 mark] 5 *05* Turn over ► IB/M/Jun20/8461/1H Do not write outside the box 16 0 1 . 9 Complete Figure 1 using data from Table 1. You should: • label the y-axis • use a suitable scale for the y-axis • plot the mean data from Table 1 for temperatures from 25 °C to 45 °C • draw a line of best fit. [5 marks] Figure 1 Turn over for the next question