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This document consists of 12 printed pages. IB16 10_1113_02/4RP © UCLES 2016 [Turn over Cambridge International Examinations Cambridge Secondary 1 Checkpoint SCIENCE 1113/02 Paper 2 October 2016 MARK SCHEME Maximum Mark : 50

2 © UCLES 2016 1113/02/O/N/16 Question number 1 Part Mark Answ er Further Information (a) 1 four (b) 1 they put the energy into t he food chain. Accept they make their own food Accept can photosynthesise Ignore they are at the start of the food chain (c) 2 increase fewer of them are being eaten (by the cod) Accept they will overpopulate Accept fewer or none of their predators l eft Accept cod is a predator of shrimp / shrimp is the prey of cod Total 4

3 © UCLES 2016 1113/02/O/N/16 [Turn over Question number 2 Part Mark Answ er Further Information (a) 1 8 Accept any value between 7.9 and 8 (b) 3 The water particles gain more kinetic energy. The particles move faster . This causes the particles to spread out. each correct word = 1 mark Do not accept heat Accept ( further ) apart / quicker / more rapidly / more vigorously Accept evaporate (c) 2 all particles touching or almost touching particles in rows / particles in a set pattern There must be an attempt to draw the spheres touching t he box does not need to be full Total 6

4 © UCLES 2016 1113/02/O/N/16 Question number 3 Part Mark Answ er Further Information (a) 2 five correct = 2 marks two, three or four correct = 1 mark one correct = 0 marks (b) 1 blue green red white yellow more than one answer ringed = 0 marks (c) 1 X anywhere within the prism Total 4

5 © UCLES 2016 1113/02/O/N/16 [Turn over Question number 4 Part Mark Answ er Further Information (a) 2 food item main type of nutrient meat carbohydrate bread fat lettuce protein butter roughage (fibre) four correct links = 2 marks two or three correct links = 1 mark one correct link = 0 marks Accept bread to roughage (b) 2 p rovides all the nutrients ( idea of ) in the correct proportions must have both ideas for 2 marks Accept provides the nutrients in the food pyramid / provides every type of nutrient Accept in the right amount / in the appropriate amount / adequate amount / in the proper amounts / suitable amounts Total 4

6 © UCLES 2016 1113/02/O/N/16 Question number 5 Part Mark Answ er Further Information (a) (i) 1 more gas is collected when the concentration is higher Accept quoting data i.e. two concentrations and two volumes Accept ora (ii) 2 more par ticles per unit volume / particles are closer together / particles are more crowded more collisions Accept more frequent collisions = 2 marks Ignore references to particles moving faster / having more energy Do not allow collides faster (b) 1 repeat them / increase the range of concentration / do more concentrations Accept measure the gas volume for a longer time period Total 4

7 © UCLES 2016 1113/02/O/N/16 [Turn over Question number 6 Part Mark Answ er Further Information (a) 1 C (b) 2 C E either order (c) 1 A , B and D all three required any order Total 4 Question number 7 Part Mark Answ er Further Information (a) 2 Any two from percentage or number of smokers has decreased percentage or number of female smokers has decreased percentage or number of male smokers has decreased. males have decreased more than females. more male smokers than females rate of decrease has slowed down for both sexes. Accept graphs show the same pattern / line(s) decrease / all the graphs decrease = 1 mark Accept the rate of decre ase gets smaller = 1 mark (b) 1 decline in number or % of smokers (means less risk of lung cancers.) Accept idea that the % of heavy smokers is probably falling Total 3

8 © UCLES 2016 1113/02/O/N/16 Question number 8 Part Mark Answ er Further Information (a) 2 each co rrect tick = 1 mark three ticks and two correct = 1 mark three ticks and one correct = 0 marks four or five ticks = 0 marks aluminium and copper chloride  copper and potassium chloride gold and silver nitrate lead and copper chloride  tin and zinc chloride (b) (i) 1 hydrogen / H 2 Accept H (ii) 1 exothermic Total 4

9 © UCLES 2016 1113/02/O/N/16 [Turn over Question number 9 Part Mark Answ er Further Information (a) 2 all correct = 2 mar ks two correct = 1 mark one correct = 0 marks Accept arrow anywhere on individual magnets (b) (i) 1 Accept arrow anywhere on the field line (ii) 1 at least two correct line(s) and correct arrow = 1 mark Do not accept contradictory arrows Do not accept lines that cross each other Total 4

10 © UCLES 2016 1113/02/O/N/16 Question number 10 Part Mark Answ er Further Information 2 Any two from (idea of) less food (production) / less photosynthesis less light / dimmer light / colder / less CO 2 / less water Mars i s further away from the Sun (than the Earth) Accept answers wherever they are written answer must be a comparison Accept no photosynthesis / no food (production) answer must be a comparison Total 2 Question number 11 Part Mark Answ er Further Inf ormation (a) 1 C (b) 1 E (c) 1 D Total 3

11 © UCLES 2016 1113/02/O/N/16 [Turn over Question number 12 Part Mark Answ er Further Information (a) 1 clockwise moment equal to anti - clockwise moment / both have the same moment / both have same turning force / both boys are the same distance from the pivot and the same weight / calculation of 400 × 3 = 400 × 3 Accept both boys are 3 m from the pivot and have a weight of 400 N Accept both have the same length and force Do not accept mass instead of weight or force but ignore mass if correct reference to moment or turning force (b) 1 the see saw tips (to the right) / does not balance Accept Mike will go down or Ahmed will go up Accept moves clockwise (c) 1 balances Accept neither Mike nor Ahmed will go up and down Accept stays the same / does not move (d) 1 the see saw tips (to the left) / does not balance Accept Ahmed will go down Total 4

12 © UCLES 2016 1113/02/O/N/16 Question number 13 Part Mark Answ er Further Information (a) 1 reptile (b) 1 arthropod (c) 1 mammal (e) 1 amphibian Total 4