Download [PDF] October 2021 CAIE P2 Mark Scheme 1113 Science Cambridge Lower Secondary Checkpoint

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[PDF] October 2021 CAIE P2 Mark Scheme 1113 Science Cambridge Lower Secondary Checkpoint.pdf | Plain Text

This document consists of 15 printed pages. IB21 10_1113_02/5RP © UCLES 2019 [Turn over Cambridge Lower Secondary Checkpoint SCIENCE 1113/02 Paper 2 FINAL MARK SCHEME October 2021 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 the Markers’ meeting before marking began, which would have considered the acceptability of alternative answers. Mark sc hemes 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.

1113/02 Checkpoint Secondary – Mark Scheme October 2021 PUBLISHED Page 2 of 15 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 other wise 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

1113/02 Checkpoint Secondary – Mark Scheme October 2021 PUBLISHED Page 3 of 15 Question Answer Mark s Further Information 1(a) part of plant cell tissue organ leaf  palisade mesophyll  root hair  2 all three parts correct = 2 marks two parts correct = 1 mark one part correct = 0 marks two ticks in a row is incorrect except accept palisade mesophyll as a cell and a tissue 1(b) part of animal cell tissue organ sperm  stomach  heart  2 all three parts correct = 2 marks two parts correct = 1 mark one part correct = 0 marks two ticks in a row is incorrec t

1113/02 Checkpoint Secondary – Mark Scheme October 2021 PUBLISHED Page 4 of 15 Question Answer Mark s Further Information 2(a) 1 both correct for the mark Note two lines from or to any box = 0 marks 2(b) sodium 1 Accept natrium Ignore Na 2(c) carbonate hydroxide oxide sulfate 1 more than one answer circled = 0 marks beryllium B Be boron Br

1113/02 Checkpoint Secondary – Mark Scheme October 2021 PUBLISHED Page 5 of 15 Question Answer Mark s Further Information 3(a) 1 both correct for the mark Note two lines from or to any box = 0 marks 3(b) any three from conduction particles vibrate (as temperature increases) particles vibrate more / vibrate faster vibration pass es from one particle to another / energy passes from one particle to another 3 each correct answer = 1 mark Accept copper is a conductor Accept particles move to and fro for vibrate or particles gain kinetic energy Note particles vibrate faster / vibrate more = 2 marks Accept heat passes from one particle to another Accept higher level answer, e.g. by electrons = 1 mark which move = 1 mark radiation convection The way the air above a heater becomes warm. The way energy from the Sun reaches the Earth. The way the metal handle of a cooking pot gets hot.

1113/02 Checkpoint Secondary – Mark Scheme October 2021 PUBLISHED Page 6 of 15 Question Answer Marks Further Information 4(a)(i) concentration / strength (of weed killer) 1 Accept amount of weed killer or amount of solution 4(a)(ii) any two from number of weeds or seedlings species of weed or seedlings age of weed or seedlings or size of weed or seedli ngs volume of weed killer length of exposure to the weed killer type of weed killer used 2 each correct answer = 1 mark Accept type of weed Accept time Accept temperature as an extra marking point Accept humidity as an extra marking point Accept light as an extra marking point Accept type of cotton wool or amount of cotton wool as an extra marking point

1113/02 Checkpoint Secondary – Mark Scheme October 2021 PUBLISHED Page 7 of 15 Question Answer Marks Further Information 4(a)(iii) any two from number of weeds or seedlings used in each dish (at the start) number of weeds or seedlings kille d or number of weeds or seedlings surviving concentration of weed killer volume of weed killer time or length of e xposure (to weed killer ) 2 each correct answer = 1 mark Accept size of weeds 4(b) any one from (weed killer ) may be toxic (weed killer ) may be corrosive (weed killer ) may be an i rritant (weed killer ) may be harmful (weed killer ) may be poisonous 1 Accept weed killer may burn skin or may kill you or may harm you or give an allergic reaction Ignore dangerous Ignore so weed killer does not affect skin Ignore damage skin must specify the type of damage

1113/02 Checkpoint Secondary – Mark Scheme October 2021 PUBLISHED Page 8 of 15 Question Answer Mark s Further Information 5(a) on the poles this is where the magnetic field is strongest 2 each correct an swer = 1 mark Accept south pole or north pole or on the ends Note this mark is independent of the poles 5(b) X written between the poles or on the poles 1 Accept the centre of the cross within the shaded region Note if two crosses drawn both must be correct 5(c) C 1

1113/02 Checkpoint Secondary – Mark Scheme October 2021 PUBLISHED Page 9 of 15 Question Answer Mark s Further Information 6(a) Universal I ndicator or pH meter 1 Accept pH paper or pH indicator Do not accept use litmus 6(b) wear eye protection or goggles (because) liquids are corrosive or irritants or h armful or wear gloves or avoid getting liquids on your skin (because) liquids are corrosive or toxic or irritants or harmful or wear a lab coat or protective clothing or avoid getting liquids on clothes (because ) liquids are corrosive or toxic or irri tants or harmful 2 safety precaution = 1 mark linked explanation = 1 mark Accept burns instead of corrosive or give an allergic reaction instead of irritation Note unqualified damage to the skin is not sufficient

1113/02 Checkpoint Secondary – Mark Scheme October 2021 PUBLISHED Page 10 of 15 Question Answer Mark s Further Inf ormation 7(a) selective breeding or artificial selection 1 Ignore cross breeding 7(b) (male ) C and (idea that) it is the variety with most wool 1 both correct for the mark Question Answer Marks Further Information 8(a) (particle X) electr on (particle Y) neutron 2 each correct answer = 1 mark Accept both names reversed for 1 mark 8(b) Co pernicus Galileo Newton Pasteur Rutherford 1 more than one answer circled = 0 marks 8(c)(i) Carbon is found in Period 2 of the Periodic Table . 1 Accept two / second / 2 nd 8(c)(ii) Ar Al B Li Si 1 more than one answer circled = 0 marks

1113/02 Checkpoint Secondary – Mark Scheme October 2021 PUBLISHED Page 11 of 15 Question Answer Mark s Further Information 9(a) C 1 9(b) B 1 9(c) D 1 9(d) C and D 1 both correct any order for the mark

1113/02 Checkpoint Secondary – Mark Scheme October 2021 PUBLISHED Page 12 of 15 Question Answer Mark s Further Information 10(a) exhaled air has less oxygen or air breathed out has less oxygen exhaled air has more carbon dioxide or air breathed out has more carbon dioxide 2 each co rrect answer = 1 mark Accept ora / 4% difference Accept ora / 3.96% difference 10(b) any two from oxygen goes into the blood or oxygen leaves the air carbon dioxide leaves the blood or carbon dioxide enters the air (by) diffusion (and) gaseous exchange 2 each correct answer = 1 mark Accept deoxygenated blood becomes oxygenated or oxygen enters capillaries Accept carbon dioxide leaves capillaries 10(c) any two from trachea or windpipe bronchus or bronchi bronchiole 1 both correct for th e mark Accept mouth, larynx or voice box , pharynx as extra parts Ignore lungs / nostril / throat

1113/02 Checkpoint Secondary – Mark Scheme October 2021 PUBLISHED Page 13 of 15 Question Answer Marks Further Information 11(a) reacts rapidly with acid and slowly with water or more bubbles with acid than water 1 Accept reacts vigorously with acid but not with water Note faster with acid is in the question so do not credit if written Note needs a comment about reaction with acid and the reaction with water 11(b) zinc or iron or lead or tin 1 Accept correct symbo l but name takes precedence , e.g. Zn / Fe / Pb / Sn 11(c) (colourless gas) hydrogen (alkaline solution) potassium hydroxide 2 each correct answer = 1 mark Question Answer Mark s Further Information 12 colour of light colour of object colour the object appears white red red green green green blue red black 2 all three correct = 2 marks one or two correct = 1 mark Ignore pink for red Accept light or dark preceding the colour Accept no light or no colour for black

1113/02 Checkpoint Secondary – Mark Scheme October 2021 PUBLISHED Page 14 of 15 Question Answer Mark s Further Information 13 (a) dispersion or dispersal 1 Ignore refraction 13(b) prism 1 Accept any type of prism

1113/02 Checkpoint Secondary – Mark Scheme October 2021 PUBLISHED Page 15 of 15 Question Answer Mark s Further Information 14 coal hydroelectric  oil natural gas solar  2 each cor rect tick = 1 mark three ticks and two correct = 1 mark three ticks and one correct = 0 marks more than three ticks = 0 marks