Download [PDF] April 2020 CAIE P2 Mark Schemes 1113 Science Cambridge Lower Secondary Checkpoint

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[PDF] April 2020 CAIE P2 Mark Schemes 1113 Science Cambridge Lower Secondary Checkpoint.pdf | Plain Text

This document has 14 pages. Blank pages are i ndicated. 05_ 1113 _02/3RP ©UCLES 2020 [Turn over Cambridge Lower Secondary Checkpoint SCIENCE 1113/02 Paper 2 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.

1113/02 Lower Secondary Checkpoint – 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 Underl ine 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 ac hieved 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 Lower Secondary Checkpoint – Mark Scheme April 2020 PUBLISHED © UCLES 2020 Page 3 of 14 Question Answer Marks Further Information 1(a) C A (E) D B 2 C and A correct = 1 mark D and B correct = 1 mark 1(b) good tasting milk / disease free / healthy 1 Ignore lots of milk Accept size / meat production / docile / good temperament 1(c) Copernicus Darwin Galileo Pasteur Rutherford 1

1113/02 Lower Secondary Checkpoint – Mark Scheme April 2020 PUBLISHED © UCLES 2020 Page 4 of 14 Question Answer Marks Further Information 2(a) increase the temperature of nitric acid more crowded particles so more collisions more surface area so more collisions increase the concentration of nitric acid particles move faster so more collisions has bigger particles so that there are more collisions 2 each correct link = 1 mark two lines from same way = 0 marks 2(b) any two from (idea that) larger pieces have smaller (surface) area / ora reaction occurs at the surface so fewer collisions / ora 2 Note assume answer refers to the reactant as a lump unless otherwise specified Accept larger pieces have less surface / fewer particles exposed (on surface) Accept particles collide less often / less frequent collisions / less chance of a collision

1113/02 Lower Secondary Checkpoint – Mark Scheme April 2020 PUBLISHED © UCLES 2020 Page 5 of 14 Question Answer Marks Furthe r Information 3(a) 86 ± 1 (m) 1 3(b) 4.7± 0.2 (s) 1 3(c)(i) (average speed = ) time distance 1 Accept d / t or s / t Ignore m / s 3(c)(ii) 18 110 6 or 6.1 (m / s) 2 correct answer = 2 marks correct working only = 1 mark Accept 6.111111 with any number of decimal places Accept 916

1113/02 Lower Secondary Checkpoint – Mark Scheme April 2020 PUBLISHED © UCLES 2020 Page 6 of 14 Question Answer Marks Further Information 4(a) large flat feet stop sinking into sand thick eyelashes stop sand getting into eyes does not produce sweat stop too much water loss or stop dehydration 3 each correct line = 1 mark 4(b) any two from thick fur lots of fat small ears short legs small surface area to volume ratio greasy coat large feet 2 each correct answer = 1 mark Accept other vali d answers

1113/02 Lower Secondary Checkpoint – Mark Scheme April 2020 PUBLISHED © UCLES 2020 Page 7 of 14 Question Answer Marks Further Information 5(a) filter it / filtration 1 5(b) evaporate the solution / crystallisation 1 Accept heat or boil the solution 5(c) magnesium + sulfuric acid hydrogen + magnesium sulfate 2 reactants (any order) = 1 mark products (any order) = 1 mark Accept correct formulae but words take precedence Accept mix of words and formulae note magnesium is Mg, sulfuric acid is H 2SO 4, hydrogen is H 2 and magnesium sulfate is MgSO 4 Question Answer Marks Further Information 6(a) decreases / gets lower 1 6(b) increases / gets higher 1 6(c) increase the temperature 1 Accept heat (it)

1113/02 Lower Secondary Checkpoint – Mark Scheme April 2020 PUBLISHED © UCLES 2020 Page 8 of 14 Question Answer Marks Further Information 7(a) Water and minerals enter plants through the root hair cells. The water and mineral solution is transported in the stems through xylem cells. The solution reaches the palisade mesophyll cells in the leaves and is used for growth. 3 each correctly sentence = 1 mark 7(b) any two from carbon dioxi de light chlorophyll enzymes 2 each correct answer = 1 mark

1113/02 Lower Secondary Checkpoint – Mark Scheme April 2020 PUBLISHED © UCLES 2020 Page 9 of 14 Question Answer Marks Further Information 8(a) metamorphic 1 Accept named metamorphic rock 8(b) atmosphere inner core mantle outer core 1 more than one answer = 0 marks 8(c) fossils 1 8(d) clay loam sandy silt 1 more than one answer = 0 marks

1113/02 Lower Secondary Checkpoint – Mark Scheme April 2020 PUBLISHED © UCLES 2020 Page 10 of 14 Question Answer Marks Further Information 9 change angle y control any two from loudness of ticking clock length of tubes type of material / type of board distance of clock from tube distance of sound meter from tube other sounds in the room measure any one from loudness of sound / sound level angle y (and x) 4 each correct answer = 1 mark Accept position of board Ignore distanc e

1113/02 Lower Secondary Checkpoint – Mark Scheme April 2020 PUBLISHED © UCLES 2020 Page 11 of 14 Question Answer Marks Further Information 10(a) nerve cell has extensions / nerve cell has connections with other cells / nerve cell has larger surface area 1 Accept nerve cell is not round Ignore have different shapes 10 (b) function – to ca rry oxygen adaptation – (idea of) large surface area / rounded shape / flexible / has haemoglobin / no nucleus 2 function = 1 mark adaptation = 1 mark Note accept mark points wherever they are written

1113/02 Lower Secondary Checkpoint – Mark Scheme April 2020 PUBLISHED © UCLES 2020 Page 12 of 14 Question Answer Marks Further Information 11 (a) 2.4 (cm 3) 1 11 (b)(i) °C 1 note award unit mark if shown in table but answer line takes precedence 11 (b)(ii) change in temperature (+3) –3 +4 1 correct numerical value including correct sign = 1 mark 11 (b)(iii) type of reaction exothermi c endothermic exothermic 1 all correct for the mark

1113/02 Lower Secondary Checkpoint – Mark Scheme April 2020 PUBLISHED © UCLES 2020 Page 13 of 14 Question Answer Marks Further Information 12(a) any two from rub the objects together charges move / electrons move from the cloth electrons move to the rod 2 each correct answer = 1 mar k charges / electrons moves must be mentioned for the second mark 12 (b) Opposite charges attract . Like charges repel . 1 both correct = 1 mark 12 (c) (A is positive .) B is positive . C is negative . D is negative . 1 all three correct = 1 mark Question Answer Marks Further Information 13 1 light energy = 10 J

1113/02 Lower Secondary Checkpoint – Mark Scheme April 2020 PUBLISHED © UCLES 2020 Page 14 of 14 BLANK PAGE