Mark Scheme (Results) Summer 2022 Pearson Edexcel International GCSE In Biology (4BI1) Paper 1B

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Question Number Answer Mark 1(a)(i) The only correct answer is A is the pancreas B is not the answer as B is not the pancreas C is not the answer as C is not the pancreas D is not the answer as... D is not the pancreas 1 Question Number Answer Mark 1(a)(ii) The only correct answer is D structure produces progesterone A is not correct as it does not produce progesterone B is not correct as it does not produce progesterone C is not correct as it does not produce progesterone 1Question Number Answer additional guidance Mark 1(b)(i) Calculation method not marking points convert hormonal speed to m / min = 4.2 m per min convert hormonal speed to m / sec = 4.2÷60 m per sec = 0.07 m per sec division 55÷0.07 = 786 :1 scores 3 allow 2 sig figs so allow 790:1 scores 3 Calculation method conversion of nerve speed to cm per min = 5500 cm per sec = 5500 x 60 cm per min = 330 000 cm per min division 330 000÷420 = 786 : 1 scores 3 Allow 785.7 to 1 for full marks and all versions of 785.7142857142857 score 3 allow 1 mark for ÷ 60 or × 60 or evidence of multiplying by or dividing by 60 allow 1 mark for ÷0.07 or :0.07 or ÷420 or :420 allow 2 marks for 1 to 786 or just number 786 etc any rounding errors such as 785:1 scores [Show More]

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