Marine Sciences Memo 2 (English)

November 2023 — Grade 12 / Matric — Marine Sciences

Memo 2023 Grade 12 English

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🎯 150 marks 📄 21 pages 📝 37 items found 📚 5 topics

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Q1— Section header —

1.2.1Aboral surf ace

1.2.2(Tidal\ ebb

1.2.3Gill rakers

1.2.4Pedicellariae

1.2.5Otoliths / ossicles

1.2.6Tapetum

1.2.7Protochordates

1.2.8Heterodontic

1.2.9Oophagy

1.2.10Urogenital opening (10 x 1\ (10\

1.3.5B only Both A and B A only None Both A and B (5 x 2\ (10\ [40] TOTAL SECTION A:40

Q2— Section header —

2.1.1MARKING GUIDELINES CRITERIA MARK ALLOCATION Descriptiv e heading (

2.1.3Less plastic waste d uring lockdown in 2020 Increased usage of environmentally friendly products More awareness of using more biodegradable

2.1.4a\ Greenwashing (1\ b\ Track microplastic s to source

2.2.1The increase in fresh water will decrease the salinity in the rock pools (Mark cause and effect\

2.2.2Seaweed holdfasts Needs to anchor them to rocks Broad feet of limpets

2.3Upper shore (1\

2.3.2Plough snails prefer moderate wave action and water with little turbulence (2\

2.3.3Meiofaunal food chain As the mollusc is decomposed broken down

2.4.1a\ Bumpy edge provides extra lift / reduces drag / hydrodynamic / quieter Mark first 1 only

2.4By looking at the process in nature to find many different ways to be more energy efficient OR Adaptations that have been

2.4.3problem was identified (to provide extra lift for the blades to rotate\ (Mammal\ specialists were called in to explain / investigate how

2.4Make use of abun dantly available materials Use recycled materials renewable materials

2.4If YES Could improve fuel efficiency Could develop a quieter a ircraft If

Q3— Section header —

3.1(a\ Open ended question. Do not mark the organism Th

3.2.2Nasal pouches nostrils would be reduced absent which allow sharks to detect tiny amounts of substances (like

3.3.2Reduce the amount of oxygen in the blood stream

3.3.3Their flesh is a popular food They are heavily exploited for their attractive shells / shells have

3.4.1Feathers trap air between them thus providing effective insulation OR

3.4.2MARKING GUIDELINES CRITERIA ELABORATION MARK ALLOCATION Correct drawing (D\ Resembles breathing

3.5.1The population of frogs will decrease / migrate Any logical relevant substantiating answer, marker discretion for insightful thinking

3.5.2Eggs require water for development as it is permeable / for reproduction to be successful Moisture on skin

3.6Pinnipe ds Cetaceans Mate/fertilise on land Mate/fertilise in water Birth offspring on land Birth offspring in water Offspring altricial

Q4— Section header —

Topics Identified

Cell BiologyGeneticsEvolutionEcologyRespiration

Mark Allocation

Total150 marks

Sections40 + 39 = 79 marks

Paper information

SubjectMarine Sciences

Year2023

SessionNovember

TypeMemo

PaperPaper 2

LanguageEnglish

Pages21

Downloads3

Examination context

Decade2020s

Years ago3y

SeasonSpring (SH)

Start daySunday

Exam periodNovember 2023

Days since exam1,085

About Marine Sciences examination preparation

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Pages21

Archived on7 September 2026

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