Cambridge Lower Secondary Checkpoint SCIENCE 1113/02 Paper 2 April 2022 MARK SCHEME Maximum Mark: 50 Published This mark scheme is published as an aid to teachers and candidates, to indicate the requirements of the examination. It shows the basis on which Markers were instructed to award marks. It does not indicate the details of the discussions that took place at a Markers’ meeting before marking began, which would have considered the acceptability of alternative answers. Mark schemes should be read in conjunction with the question paper and the End of Series Report. Cambridge will not enter into discussions about these mark schemes. This document has 18 pages. Any blank pages are indicated. IB22 05_1113_02/8RP © UCLES 2022 [Turn over 1113/02 Cambridge Lower Secondary – Mark Scheme PUBLISHED April 2022 General guidelines on marking Many descriptive answers can be expressed in a variety of ways. Professional judgement can be used in these cases, providing it matches the marking points and further information in the mark scheme. Answers may have words spelt incorrectly. Credit is normally given for phonetically correct answers, unless the word has a scientifically different meaning. For example, where the answer should be antennae, credit will be given for antena but not for anthen (too close to anther). Only the science is being assessed so answers do not need to be grammatically correct. Significant figures will be indicated in the question or in the mark scheme. Unless specified all marking points are independent. Annotations and abbreviations / or alternate responses for the same marking point ( ) brackets the words or units in brackets do not need to be stated, for example, (recycles or releases or provides) minerals = minerals scores the mark Underline exact word is required Accept an acceptable response Do not accept indicates an incorrect response that would contradict another otherwise correct alternative Ignore indicates an irrelevant answer that is not creditworthy. Full marks can still be achieved even with answers that are ignored. Note provides extra information when necessary ecf error carried forward; marks are awarded if an incorrect response has been carried forward from earlier working, provided the subsequent working is correct ora or reverse argument; for example, as mass increases, volume increases could be written as mass decreases, volume decreases Page 2 of 18 1 Question 1113/02 cell drawing Answer Page 3 of 18 transports oxygen absorbs water and minerals detects changes in the surroundings pollinates the stigma of a flower joins with an egg contacts to cause movement makes sugar using photosynthesis function Further Information April 2022 more than one line from cell drawing = 0 marks for that cell drawing one correct = 1 mark two or three correct = 2 marks four correct = 3 marks 4 all five correct = 4 marks Marks Cambridge Lower Secondary – Mark Scheme PUBLISHED (b) 2(a) Question 1113/02 carbon dioxide potassium chloride sodium sulfate calcium nitrate salt made Answer Page 4 of 18 Further Information April 2022 1 Accept CO2, but name takes precedence Do not accept potassium chlorine or potassium chlorite Do not accept sodium sulfide or sodium sulfurate Accept sodium sulphate Do not accept calcium nitride Note if name and formula given both must be correct Accept correct formulae Ca(NO3) 2, Na 2SO4, KCl 3 full name of each correct salt = 1 mark Marks Cambridge Lower Secondary – Mark Scheme PUBLISHED light travels from the Sun to our eyes star Moon reflects sunlight (b)(ii) (c) the Earth spins on its axis Answer Page 5 of 18 Further Information April 2022 Do not accept light reflects off the Sun or Moon emits light 1 Accept Moon reflects Sun’s rays or light from Sun bounces off it to the Earth or reflects light from the Sun Do not accept Moon or planet Ignore galaxy or galaxies 1 Accept named stars, e.g. Sirius or Polaris or Vega Ignore reference to reflection Note light travels from the Sun is not sufficient 1 Accept light travels from Sun to the Earth Accept any description of the Earth moving 1 Accept Earth moves or Earth rotates Marks Cambridge Lower Secondary – Mark Scheme PUBLISHED (b)(i) 3(a) Question 1113/02 (D) (B) 4 F C Answer Page 6 of 18 A E Further Information April 2022 if no marks awarded give 1 mark for A E (B) (D) F C A and E = 1 mark 2 F and C correct = 1 mark Marks Cambridge Lower Secondary – Mark Scheme PUBLISHED Question 1113/02 (b)(i) 5(a) Question 1113/02 move slowly (move quickly) close (together) or regular (close together) far apart or random solid liquid gas Page 7 of 18 vibrate arrangement of particles diffusion movement of particles Answer Further Information 1 April 2022 Accept particles in a gas are scattered or particles are separated or further apart Accept move faster than in a solid or move slower than in a gas or particles flow over each other Ignore particles in a solid do not move or fixed position Accept particles in a solid are packed together or tight together or tight arrangement one correct = 0 marks two or three correct = 1 mark 2 all four correct = 2 marks Marks Cambridge Lower Secondary – Mark Scheme PUBLISHED (b)(ii) 1113/02 Page 8 of 18 particles have spread out (to fill the space) Cambridge Lower Secondary – Mark Scheme PUBLISHED Do not accept idea of particles combining or particle gaining energy or particles expanding Note particles mixing is not sufficient Accept (idea of) particles moving Accept movement (of particles) from region of high concentration to one of low concentration 1 Accept random motion of the particles April 2022 (idea that) there is a (downward) force any number less than 4 (cm) any two from (a)(ii) (b)(i) (b)(ii) moment decreases or is less (idea that) distance is less (idea that) a moment is force × distance (idea that) the ruler bends more Answer Page 9 of 18 Marks Cambridge Lower Secondary – Mark Scheme PUBLISHED 6(a)(i) Question 1113/02 Accept if force is the same and the distance between the force and the fulcrum decreases the moment decreases = 2 marks Accept moment = weight × distance Accept turning force instead of moment throughout Ignore references to pressure 2 each correct answer = 1 mark 1 Do not accept 0 Do not accept there is pressure Ignore it is pulled down 1 Accept gravity or the weight (of the object) or it has (more) weight or a (larger) force 1 Accept the distance increases Further Information April 2022 gaseous exchange any one from (b)(i) (b)(ii) Page 10 of 18 good blood supply or (surrounded) by capillaries thin or permeable or elastic or moist large surface area breathing or moves air in and out of the lungs B Answer Marks Cambridge Lower Secondary – Mark Scheme PUBLISHED (a)(ii) 7(a)(i) Question 1113/02 1 Accept have enough surface area 1 Accept take up oxygen or get rid of carbon dioxide or provide oxygen to the blood or exchange of carbon dioxide and oxygen Accept separates thorax from abdomen Accept lungs to expand or lungs to contract Accept ventilation or inhalation or exhalation Accept to bring air or oxygen into the lungs 1 Accept to inhale air or to exhale air 1 Further Information April 2022 (b) 8(a) Question 1113/02 H (one) proton (nucleus containing) Answer Page 11 of 18 electron Marks Cambridge Lower Secondary – Mark Scheme PUBLISHED Do not accept h 1 Ignore H2 Do not accept neutrons in the nucleus Accept protons Accept electrons 2 each correct answer = 1 mark Further Information April 2022 rule(r) or callipers any one from (b) (c) Accept in case there is an anomalous result or to make sure the outcome is correct Accept to compare results or see if results are the same Accept to make it more reliable to check for error 1 1 Ignore metre rule(r) or measuring tape Do not accept for accuracy Accept so we can compare Ignore accuracy or fair Page 12 of 18 Further Information 1 Accept fair test Marks April 2022 to enable average to be taken to look for consistency in tests (length is a) control variable Answer Cambridge Lower Secondary – Mark Scheme PUBLISHED 9(a) Question 1113/02 (b) 10(a) Question 1113/02 Further Information cheap to use Page 13 of 18 no pollution or no greenhouse gases or no harmful gases Accept ora for fossil fuels Accept no acid rain pollution or does not harm environment or cleaner source of energy or no carbon emissions Accept named non-renewable fuel is running out Accept reduce the use of fossil fuels or conserves fossil fuels or conserves nonrenewable energy sources renewable running out of non-renewable fuels Accept will not run out of wind 2 each correct answer = 1 mark Note it depends on the weather is not sufficient Accept it is not a reliable energy source Accept need placing in windy areas 2 each correct answer = 1 mark Marks April 2022 energy needs are increasing any two from (idea that) difficult to connect to the (electricity) grid kill birds spoil view noisy (often) in remote places (idea that) not always windy or energy generation not constant any two from Answer Cambridge Lower Secondary – Mark Scheme PUBLISHED 11 Question 1113/02 rusting respiration oxidation neutralisation Page 14 of 18 exothermic endothermic displacement Answer Cambridge Lower Secondary – Mark Scheme PUBLISHED Further Information more than three circled = 0 marks three circled and one correct = 0 marks 2 three circled and two correct = 1 mark Marks April 2022 13 Question 12 Question 1113/02 Aeshna Argiope Calliphora Formica Scorpio name Answer Page 15 of 18 letter Y W V X Z (idea of) recycling nutrients or minerals (may give an example, e.g. in N cycle) (idea of) something that lives on dead or decaying material or breaks down dead tissue or (organism that) causes something to rot or decay or breaks down organic matter Answer Cambridge Lower Secondary – Mark Scheme PUBLISHED Guidance Further Information one correct = 0 marks two, three or four correct = 1 mark 2 all five correct = 2 marks Marks Note mark answers wherever they appear Note ‘gets rid of dead matter’ is not sufficient Accept recycling carbon compounds or making manure or making compost or increases soil fertility importance = 1 mark Accept idea of using waste products as food Ignore the term decompose in their answer and use an alternative term in their description 2 definition = 1 mark Marks April 2022 (b)(ii) (b)(i) 15(a) Question (b) 14(a) B Answer C francium K N Na potassium hydroxide or hydrogen same pressure A P Po E Page 16 of 18 D Answer Question Further Information April 2022 Further Information 1 Accept Fr, but if symbol and name given they must both be correct 1 more than one answer circled = 0 marks 1 Accept KOH or H2, but name takes precedence Marks 1 1 more than one answer circled = 0 marks Marks Cambridge Lower Secondary – Mark Scheme PUBLISHED 1113/02 16 32.5 –11.0 B C 0.0 temperature in °C A thermometer Page 17 of 18 Answer Question 2 Marks Cambridge Lower Secondary – Mark Scheme PUBLISHED 1113/02 Accept 0 and –11 one correct = 0 marks two correct = 1 mark all three correct = 2 marks Further Information April 2022 1113/02 Page 18 of 18 BLANK PAGE Cambridge Lower Secondary – Mark Scheme PUBLISHED April 2022
