SCIENCE 101 > GCSE MARK SCHEME > Mark Scheme (Provisional) Summer 2021 Pearson Edexcel International GCSE In Science (Single Award) ( (All)

Mark Scheme (Provisional) Summer 2021 Pearson Edexcel International GCSE In Science (Single Award) (4SS0) Paper 1B. RATED A+

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Question Number Answer Mark 1(a) A nucleus (1) B mitochondrion / a (1) 2 Question Number Answer Mark 1(b)(i) An answer that includes two of the following points: • chloroplast (1) • cel... l wall (1) • starch grain (1) 2 Question Number Answer Mark 1(b)(ii) • not multicellular / are single-celled / can move from one place to another / has flagella (1) 1 Question Number Answer Mark 1(c) An explanation that makes reference to two of the following points • light captured / absorbed by chloroplast / chlorophyll (1) • in photosynthesis (1) 2 Question Number Answer Mark 1(d) • move / propel / swim /eq (1) 1 http://britishstudentroom.wordpress.com/Question Number Answer Additional guidance Mark 1(e) measure size of line on diagram (= 44 mm 43-45) (1) ×1000 convert mm into µm (1) Magnification = size of line in µm ÷15 µm 44000÷15 = 2933 allow 2 marks for any mag between 2667 and 3000 40-45mm 1mark for ×1000 if measured in cm allow 1 for × 10000 2 total 10 marks http://britishstudentroom.wordpress.com/Question Number Answer Mark 2(a) The only correct answer is D oxygen A is not correct as carbon dioxide is not given off B is not correct as carbon monoxide is not given off C is not correct as methane is not given off 1 Question Number Answer Mark 2(b)(i) • light intensity / distance / eq (1) 1 Question Number Answer additional guidance Mark 2(b)(ii) • temperature / concentration of carbon dioxide (1) allow colour / wavelength of light allow pH/eq 1 Question Number Answer Mark 2(c)(i) • 15/ 15.3 / 15.33 (1) Clip with 2 (c) (ii) and with table 1 Question Number Answer additional guidance Mark 2(c)(ii) • An answer that includes : Clip with 2 (c) (i) and table • S scales linear and half of page (1) • L straight lines joining points (1) • A1 axes correct way around (1) • A2 labelled (number of) bubbles per minute and distance in cm (1) • P points correctly plotted within 1 small square (1) bar chart loses L [Show More]

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