Biology > MARK SCHEME > GCSE COMBINED SCIENCE: TRILOGY 8464/B/1H – BIOLOGY PAPER 1 HIGHER TIER Mark scheme 8464 June 2018  (All)

GCSE COMBINED SCIENCE: TRILOGY 8464/B/1H – BIOLOGY PAPER 1 HIGHER TIER Mark scheme 8464 June 2018 Version/Stage: 1.0 FinaL.. RATED A+

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Question Answers Extra information Mark AO / Spec. Ref. 01.1 nucleus prokaryotic cells permanent vacuole plant cells only plasmids eukaryotic cells allow 1 mark for one or two correct links 2 A... O1 4.1.1.1 4.1.1.2 01.2 vacuole ribosome cell wall tick box takes precedence if no tick is given, look at both the figure and the circling of words in the table if writing is seen on the figure and in the table both must be correct 1 AO1 4.1.1.2 01.3 turn the (fine focusing) knob until the cells are in focus allow focus it do not accept increase magnification ignore decrease magnification ignore clear ignore references to resolution / illumination ignore zoom in / out 1 AO2 4.1.1.2 7MARK SCHEME – GCSE – COMBINED SCIENCE: TRILOGY – 8464/B/1H – JUNE 2018 Question Answers Extra information Mark AO / Spec. Ref. 01.4 (rotate the) nosepiece / objective lens to a higher power (lens) allow change the (objective / eyepiece) lens allow (to) increase the magnification a comparator is required ignore change / adjust the magnification allow stronger or more powerful lens ignore references to resolution / illumination unqualified ignore zoom in / out ignore references to an electron microscope 1 1 AO2 4.1.1.2 8MARK SCHEME – GCSE – COMBINED SCIENCE: TRILOGY – 8464/B/1H – JUNE 2018 Question Answers Extra information Mark AO / Spec. Ref. 01.5 conversion of units: (112 mm ) 112 000 (µm) or (280 µm ) 0.28 (mm) (magnification =) 112 0.28 or (magnification =) 112 000 280 400 (×) an answer of 400 (×) scores 3 marks allow 1 mark for no conversion of units 112 / 280 or incorrect value from step 1 correctly substituted do not accept if units are given if no other mark scored allow 1 mark for: magnification = size of image size of real object a triangle with words or letters in is insufficient, as the correct rearrangement is needed 1 1 1 AO2 4.1.1.2 Total 9 9MARK SCHEME – GCSE – COMBINED SCIENCE: TRILOGY – 8464/B/1H – JUNE 2018 Question Answers Extra information Mark AO / Spec. Ref. 02.1 is not caused by a pathogen / infective organism (so ) is not passed / spread (from person to person) allow not caused by a microorganism / microbe ignore not caused by infection ignore named pathogen unless bacteria, virus and fungus all mentioned allow cannot be spread / caught allow is not infectious / contagious 1 1 AO1 4.2.2.4 4.2.2.5 4.3.1.1 4.3 AO2 4.2.2.4 4.2.2.5 4.3.1.1 4.3 02.2 reduced / restricted / stopped blood flow (so) less oxygen reaches heart (muscle / cells) (so heart muscle / cells) cannot respire (enough) or (so heart muscle / cells) do not release (enough) energy allow ‘it’ for heart it does not matter where blood flow is restricted to – heart / body must reference heart / it allow no oxygen reaches the heart (muscle / cells) do not accept do not make / produce / create energy ignore references to breathing / suffocation ignore blood clots / blockage [Show More]

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