Marine Sciences Memo 1 (English)

November 2024 — Grade 12 / Matric — Marine Sciences

Memo 2024 Grade 12 English

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🎯 150 marks 📄 20 pages 📝 45 items found 📚 3 topics

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Q1— Section header —

1.2.1Climate 1.

2.2Aerators

1.2.3Aragonite

1.2.4Raceway

1.2.5Fetch

1.2.6Climograph / Climate graph

1.2.7Mitigation (measures\

1.2.8Brood stock

1.2.9Industrial revolution / Industrialisation / Industrial era

1.2.10Wave height (10 x 1\ (10\

1.3.5BOTH A AND B NONE BOTH A AND B A ONLY B ONLY (5 x 2\ (10\ TOTAL SECTION A: 40

Q2— Section header —

2.1.1Calculations Bycatch species Calculation Degrees Degrees rounded off John Dory 30/780*360 = 13,8

2.1.2The fish stock will decrease * / negative effect fisheries collapse due to the species / gen etic diversity of the fish stock will be

2.1.3Size frequency of the fish caught in the samples shows how successful the recruitment of the fish stock has been. The growth rate of the species measured shows the extent to which a fish stock has recovered from past

2.2.1South coast (1\

2.2.2Warm temperate region (1\

2.2.3Due to the high rainfall / all year round Afromontane Forests

2.2.4(a\ It will result in habitat destruction OR The water quality of the lakes would decrease (as a result of sedimentation / dissolved pollutants\ OR

2.3.1Diameter (cm\f the opening (1\

2.3.2

2.3.3They had a small sample size / Each aperture was only tested once Only one device per diameter was used / The invest igation was not repeated

2.3.43:1 (1\

2.3.5The larger the diameter of the opening, the higher / larger the ratio volume of oil to water collected. Both variables present 1 mark Di rection of conclusion 1 mark

2.3.6Oil is a non polar molecule / hydrophobic Which does not dissociate in water (The oil tends to float on the water\ as it has a lower density

2.3.7The 4 cm tube has larger diameter / aperture / opening Collecting more water than oil because less oil will be found under the water

Q2— Section header —

Q3— Section header —

3.1.1(a\ Turbine generator (1\ (b\ warmer (surface\water colder (deep\ater

3.1.2(a\ (1\ (b\ Greater / larger temperature difference

3.1.3(a\ Environmental cost (1\ (b\ It reduces the use of non renewable resources / fossil

3.1.4IF YES This would reduce the financial / environmental costs, therefore more companies will produce more renewable electricity, making it more accessible to the general public F NO

3.2MARKING GUIDELINES CRITERIA ELABORATION MA RK ALLOCATION Correct drawing (D\ Side view

3.3.1

3.3.2The SE trade winds will be stronger than normal driving more than normal warm surface water towards the western Pacific / away from the South American / Peru coast /

3.4.1(a\ (1\ (b\ Shells contain high amounts of calcium carbonate F is close to the sea shore

3.4.2IF YES It could increase biodiversity IF NO It is not the natural progression of the ecosystem / ecosystem has to change by itself (Mark only allocated for Yes or No if answer is motivated

3.5.1= 2.3 + 1 3,3 bar = X

3.5.2The bends / Decompression sickness (1\

3.5.3As the waves move through the vertical water column The water particles rise, move forwards, move down with the passing of the trough / crest and back again to the equilibrium surface in an orbital or elliptical path or pattern

Q4— Section header —

Q5— Section header —

Topics Identified

GeneticsEvolutionEcology

Mark Allocation

Total150 marks

Sections34 + 41 = 75 marks

Paper information

SubjectMarine Sciences

Year2024

SessionNovember

TypeMemo

PaperPaper 1

LanguageEnglish

Pages20

Downloads4

Examination context

Decade2020s

Years ago2y

SeasonSpring (SH)

Start dayTuesday

Exam periodNovember 2024

Days since exam721

About Marine Sciences examination preparation

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