AQA A-LEVEL BIOLOGY PAPER 3 2020 QUESTON PAPER

AQA A-LEVEL BIOLOGY PAPER 3 2020 QUESTON PAPER Please write clearly in block capitals. Centre number Candidate number Surname Forename(s) Candidate signature I declare this is my own work. IB/M/Jun20/E14 7402/3 A-level BIOLOGY Paper 3 Monday 15 June 2020 Morning Time allowed: 2 hours Materials For this paper you must have: • a ruler with millimetre measurements • a scientific calculator. Instructions • Use black ink or black ball-point pen. • Fill in the boxes at the top of this page. • Answer all questions in Section A. • Answer one question from Section B. • You must answer the questions in the spaces provided. Do not write outside the box around each page or on blank pages. • If you need extra space for your answer(s), use the lined pages at the end of this book. Write the question number against your answer(s). • Show all your working. • Do all rough work in this book. Cross through any work you do not want to be marked. Information • The marks for the questions are shown in brackets. • The maximum mark for this paper is 78. *JUNDo0wnl1oad* For Examiner’s Use Question Mark 1 2 3 4 5 6 7 TOTAL *02* IB/M/Jun20/7402/3 1 Section A Answer all questions in this section. You are advised to spend no more than 1 hour and 15 minutes on this section. Do not write outside the box Guppies are small fish. Female guppies are dull in colour. Male guppies can be bright or dull in colour. Scientists investigated the effect of female brain size on choosing a mate. They used laboratory-bred female guppies with large brains and with small brains. They set up a fish tank as shown in Figure 1. Figure 1 They observed each female for 10 minutes and recorded which male they were attracted towards. They repeated this with 45 large-brained females and 45 small-brained females. . Suggest three possible limitations of this investigation.