2011 sa revision paper 1 answer key

7/27/2019 2011 SA Revision Paper 1 Answer Key

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2011 SA Revision Paper 1 Answer Key

Section A

1. 2

2. 43. No answer! Should be mould, bacteria and fungi4. 45. 36. 17. 48. 29. 110.211.412.3

13.414.215.116.417.418.119.220.321.322.423.3

24.125.326.427.228.429.330.4


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Section BQn Answer Remarks

31)a)

b)

32a) The like/ same poles [1/2] of Magnets A and B arefacing each other, so they repel each other [1/2].

b) It would become shorter/smaller [1/2] because the likepoles of Magnets B and X are facing each other andrepelling each other, pushing Magnet B closer toMagnet A [1/2].

Repel each other more = okForce/pressure on B = ok

Magnet A attracts X = ok

33a) A : Solid / Liquid [1/2] either or both okB: Gas [1/2]

b) There are air spaces / holes [1] within the sponge whichcan be compressed [1].

Amount of undigested food in 100g of food

Parts of thedigestivesystem

Gullet / oesophagus

[1]


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34a)

b) The plastic lunch box is much lighter than the metal tiffinbox so children can carry it more easily.[1]

Must write in the positive and refer to plastic material

35 The plant used the food (starch) [1/2] stored in theseed leaves [1/2] forlife processes/growth/respiration [1/2], as a result, themass decreased. As the leaves develop [1/2] , it isable to photosynthesise [1/2] and make food, thusincreasing its mass.

36a) From 6am to 6pm, there is sunlight (1/2). Theplant would photosynthesise (1/2). It takes in carbondioxide (1) from the surrounding for photosynthesis.

b) The higher the light intensity, the higher the rate ofphotosynthesis [1/2] up to a certain point. [1/2]

Remains constant after a certain point / after awhile = oksaturation point = ok

37 Give 3 marks as long as all of the following areincluded:Fair test control of variables such as soil and water [1]

Vary no. of seeds must specify exact no. [1]Measurement of growth [] over/after period of time []

Example of possible answer- Put an equal amount of soil in two cups- Place 5 seeds in one cup and 30 seeds in the otherbeaker (can be any number as long as there issignificant difference between the two)

Metal TiffinBox

Plastic Lunch Box

It is a goodconductor ofheat.

It allows lightto passthrough.


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- Add equal amounts of water into each cup regularly- Measure the height of the seedlings every day for 2weeks (any logical duration at least one week)- Compare the average height of the seedlings in thetwo set-ups

Accept any possible indicators of growth- height of the seedling- time taken for the seeds to germinate- number of leaves

38 The number of sperm surviving after 6 hours increasesas temperature increases from 34 to 35C [1/2] anddecreases after 35C [1/2] until 0 at 37C [1/2]. After37C, no sperm survives [1/2].

35oC is the optimum temperature = ok [1/2]

39a) Container A. The water in container A has a largerexposed surface area (1m) than container B so morewater evaporated (1m) from container A than containerB. (Container A is therefore lighter than container B.)

higher rate of evaporation = ok

b) Tim would observe:More water is left / remains in both containers [1]

OrThe balance would be less tilted (downwards at containerB) [1]

Must be observation

Difference in amount of water in beakers A and B issmaller = ok

40

Statements True False Notpossible

to tell

K is made of iron.

K is a better

conductor of

electricity than M.


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41a) Bulbs A, B, C and D. [1] no mark

b) Bulb E. [1]

c) Bulbs must be arranged in parallel. Batteries can bearranged in series/parallel. [2]

42a) (i) The body need a great increase in volume ofoxygen [1/2] to release energy from digested food/ respiration.[1/2]

(ii) Waste product such as carbon dioxide [1/2] isproduced at a faster rate during exercise and thisunwanted gas is also expelled quickly [1/2].

b)

43a) (i) A: water [1/2]Dissolved mineral salts and / or water = ok(ii) B: food [1/2]Sugar / glucose = ok(ii) Plant transport system has separate tubes to carryfood and water [1/2] while in human transport system

Breathing rate/breaths per min

Time / min

30


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food and water are carried together in the blood vessels.[1/2]

Human transport system has a heart to pump / circulatematerials around the body which is not present in theplant.[1]

Human system is cyclical, plant is non-cyclical [1]

b) (i) It has thin walls [1] (or) It has a large surface area. [1]

Capillaries are one-cell thick = ok, [1]

(ii)

System Part of the system

Digestivesystem

Small intestine [1/2]

Respiratorysystem

Around the air sac /air sac /Alveoli [1/2]Lung [1/2]

44a) Independent variable: Thickness of material [1]Dependent variable: Amount of weight needed [1]

Number of weights = ok [1]Weights needed to break the material = ok [1]

b) This is to ensure that the results [1/2] is reliable [1/2].

2011 sa revision paper 1 answer key

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