Download [PDF] April 2020 CAIE P1 Mark Schemes 1113 Science Cambridge Lower Secondary Checkpoint

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[PDF] April 2020 CAIE P1 Mark Schemes 1113 Science Cambridge Lower Secondary Checkpoint.pdf | Plain Text

This document has 14 pages. Blank pages are indicated. 05_ 1113 _01/4RP ©UCLES 2020 [Turn over Cambridge Lower Secondary Checkpoint SCIENCE 1113/01 Paper 1 April 2020 MARK SCHEME Maximum Mark: 50 Published This mark scheme is published as an aid to teachers and learners, to indicate the requirements of the examination. However, we have not been able to adjust it to reflect the full range of answers that would have been seen as a part of the normal moderation and marking process, and it does not necessarily contain all the possible alternatives that might have arisen. Cambridge will not enter into discussions about the mark scheme.

1113/01 Checkpoint Secondary – Mark Scheme April 2020 PUBLISHED © UCLES 2020 Page 2 of 14 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 Under line 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 a chieved 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 or a or reverse argument; for example, as mass increases, volume increases could be written as mass decreases, volume decreases

1113/01 Checkpoint Secondary – Mark Scheme April 2020 PUBLISHED © UCLES 2020 Page 3 of 14 Question Answer Marks Further Information 1 part of a cell only in animal cells only in plant cells in both animal and plant cells cell membrane  cell wall  chloroplast  2 all three correct = 2 marks two correct = 1 mark one correct = 0 marks if more than one tick in a row, 0 marks for that row

1113/01 Checkpoint Secondary – Mark Scheme April 2020 PUBLISHED © UCLES 2020 Page 4 of 14 Question Answer Marks Further Information 2(a) 2 all four correct = 2 marks two or three correct = 1 mark one correct = 0 marks 2(b) any two from plastic is an insulator / does not conduct electricity (idea of) makes the wires safe / prevents electrocution flexible can be coloured 2 each correct answer = 1 mark Accept other valid answers 2(c) All metals have low melting points. Some metals are gases at room temperature. All metals conduct heat.  All metals are brittle. 1 more than one box ticked = 0 marks

1113/01 Checkpoint Secondary – Mark Scheme April 2020 PUBLISHED © UCLES 2020 Page 5 of 14 Question Answ er Mark s Further Information 3(a) Sun 1 3(b) any two from planets move around the Sun / planets do not move around the Earth / only the Moon moves around the Earth the Earth moves / the Sun does not move (idea that) not all the planets are in the m odel the order of the planets is not correct orbit size is not correct / not to scale objects in model are not to scale 2 each correct answer = 1 mark Accept named planets missing e.g. Uranus is not in the model 3(c) any one from the Moon moves around the Earth planets move in orbits a correct statement about the order of the planets e.g. a correct statement about the relative size of the planets e.g. Jupiter is the largest planet 1

1113/01 Checkpoint Secondary – Mark Scheme April 2020 PUBLISHED © UCLES 2020 Page 6 of 14 Question Answer Marks Further Information 4(a) 2 all three correct = 2 marks one or two correct = 1 mark 4(b) A = artery C = vein 2 Accept aorta / named artery Accept vena cava / named vein

1113/01 Checkpoint Secondary – Mark Scheme April 2020 PUBLISHED © UCLES 2020 Page 7 of 14 Question Answer Marks Further Information 5(a) chlorine and bromine 1 both correct = 1 mark Accept liquid and gas 5(b) Cl 1 Accept Cl2 5(c) Forces between the particles push them apart. The particles are free to move.  The particles can easily be squashed into a small space. The particles increase in size to fill the space. 1 mor e than one box ticked = 0 marks 5(d) any two from particles gain energy / (some) particles have more kinetic energy / (some) particles move faster particles have overcome attraction between them / idea that forces between particles have been broken p articles have spread further apart (in the gas phase) 2 Accept molecules instead of particles Do not accept boils Accept bromine changes to a gas / bromine changes to vapour Accept particles diffuse into the air / particles escape from the liquid

1113/01 Checkpoint Secondary – Mark Scheme April 2020 PUBLISHED © UCLES 2020 Page 8 of 14 Question Answer Marks Further Information 6(a) vibrating / moving (air) particles 2 Accept rarefaction and compression as an alternative to vibrating 6(b)(i) any wave with greater amplitude 1 At least one wave greater than 6 small squares. Above or below the midline Ignore frequency 6(b)(ii) any wave with greater frequency 1 Diagram must show at least two complete waves Accept incomplete waves providing at least two complete waves are drawn Ignore amplitude Question Answer Marks Further Information 7(a) (seed germination) pollination fertilisation seed formation 1 all three in correct order for one mark 7(b) method of seed dispersal reason A by animals have hooks / attach to hair or fur B by wind light (weight ) / feathery / parachute shaped 2 each method and reason correctly linked = 1 mark

1113/01 Checkpoint Secondary – Mark Scheme April 2020 PUBLISHED © UCLES 2020 Page 9 of 14 Question Answer Marks Further Information 8(a)(i) 3 1 8(a)(ii) 4 1 8(b) 2.8.1 or 2 If drawn ignore distribution of electrons within each shell so long as numbers are correct Accept dots or circles instead of crosses total of 11 electrons drawn outside of the nucleus = 1 mark But drawing showing 2.8.1 = 2 marks Accept correct use of 2.8.1 notation = 2 marks Ignore any particles shown in the nucleus

1113/01 Checkpoint Secondary – Mark Scheme April 2020 PUBLISHED © UCLES 2020 Page 10 of 14 Question Answer Marks Further Information 9(a)(i) both picked up 24 / both picked up the maximum number of paper clips 1 9(a)(ii) using more paper clips 1 Accept repeat using bigger paper clips / replace with iron filings and measure the mass of ir on filings 9(b)(i) fewer paper clips picked up 1 9(b)(ii) their hands are different / Pierre’s hand is bigger / Mike’s hand is smaller 1

1113/01 Checkpoint Secondary – Mark Scheme April 2020 PUBLISHED © UCLES 2020 Page 11 of 14 Question Answer Marks Further Information 10(a)(i) answer in the range pH 2 – pH 2.5 1 10 (a)(ii) any two from test at more pH values test between pH 1 and pH 3 / test at pH 2 repeat the experiment / take averages 2 each correct answer = 1 mark 10 (b)(i) any one from liquid is corrosive / burn tissue / liquid would harm skin 1 10 (b)(ii) any one from wear goggles / wear gloves / apron / lab coat do not taste / smell the liquid use only small quantities 1 Accept avoid contact with skin / avoid contact with eyes / do not swallow / do not ingest it / mop up spillages 10 (c) any one from (keep same) temperature (use same) amount or proportion or concentration of enzyme (use same) amount or proportion or concentration of egg white mix liquids evenly 1

1113/01 Checkpoint Secondary – Mark Scheme April 2020 PUBLISHED © UCLES 2020 Page 12 of 14 Question Answer Marks Further Information 11(a) colour change / fizzing / bubbles / new subs tance forms / some form of coating 1 Accept temperature change 11 (b)(i) magnesium nitrate x x x 1 Ignore X in the grey box 11 (b)(ii) copper 1

1113/01 Checkpoint Secondary – Mark Scheme April 2020 PUBLISHED © UCLES 2020 Page 13 of 14 Question Answer Marks Further Information 12 (a) see diagram below 1 reflected ray correct by e ye = 1 mark Do not accept arrow in the wrong direction note − arrow does not need to be shown 12 (b) see diagram below 1 refracted ray correct by eye = 1 mark Ignore arrows 12 (c) see diagram below 2 two rays from light source continued to edge of object and onto screen = 1 mark middle ray goes to object = 1 mark Ignore arrows

1113/01 Checkpoint Secondary – Mark Scheme April 2020 PUBLISHED © UCLES 2020 Page 14 of 14 Question Answer Marks Further Information 13 (glucose) + oxygen water + carbon dioxide 2 oxygen as a reactant = 1 mark water and carbon dioxide (either order) as products = 1 mark Accept formula but names take precedence • oxygen, O 2 • water, H 2O • carbon dioxide, CO 2