Life Sciences version 1 Life Sciences version 2 English P2

November 2012 — Grade 12 / Matric — Life Sciences version 1

Past Paper 2012 Grade 12 English Life Sciences Hub →

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🎯 150 marks 📄 16 pages 📝 46 items found 📚 3 topics 🔑 1 key info

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Q1— Section header —

1.1Various options are given as possible answers to the following questi ons. Choose the correct answ er and write only the letter (A D\ ne

1.1\ in the ANSWER BOOK, for example

1.1.1There sil evi earliest ife cause organi not hard

1.1Deforestation by a forestry company le to a reduction in biodiversity. Why should society be concerned about this decrease? A greater biodiversity increases the chance of climate change. The forest food chains would be

1.1The table below shows the number o f differences in the amino acid sequence of the protein al bumin in four species of primates Species of primates Monkey Gibbon

1.1Which o f the combination below refer the sources of variation in a population (i\ Random fusion of gametes during reproduction (ii\ Crossing over during meiosis

1.1.5After the publication of scientist s resu lts, other scientists repeated investigation. What is the correct scie ntific reason for repeating the investigation? Other scientists ... want to

1.1.6The numbers I, II, III and IV below refer to four populations of frogs. These populations are represented diagrammatically by circles verlapping circles show populations that are capable of interbreeding

1.1.7From the cladogram below which statement is CORRECT about the relat ionship between B and C are the most

1.2.6The use of resources in such a way that they a re still available for future generation The present day distribution of similar organisms Numerous interacting food chains that show the feeding relationships in an ecosystem

1.3Indicate whether each of the statements in COLUMN applies to ONLY ONLY BOTH AND or

1.3.8\ in the ANSWER BOOK COLUMN I COLUMN II

1.3.1Natural resource in South Africa Rooibos tea B: Hoodia

1.3.2The study of ancient humans and their cultural activities A: Palaeontology B: Anthropology

1.3.3The disease (s\ caused by air pollution A: Typhoid fever B: Bilharzia

1.3.4The results of an increase in the mount of carbon dioxide in the atmosphere Global warming B: Acid r ain

1.3.5Produces offspring similar to the parents A: Inbreeding B: Outbreeding

1.3.6Substance that can be recycled reused Glass Coal

1.3.7The causes of overexploitation of some resources A: Poverty B: Medicinal purpose

1.3.8Dating of fos sils by comparing the age of one fossil to another A: Absolute dating Relative dating x 2\

1.4.5What is the relationship between the distance from the se wage let and the percentage of dissolved oxygen present? Name TWO factors that the environmental health officers could have kept constant during th

Q2— Section header —

2.1.5Which fossils were most prevalent 440 mya? In which period were the fossils of the Kirkwood dinosaur the most prevalent? Explain

2.1.3belong? Describe how the proposed hypothesis of meteorite impact led to the extinction of di nosaurs (1\ (11

2.2The graph below shows the results of an experiment done to investigate the average time that fruit flies can survive without food (starvation resistance\ The average starvation resi stance time is when 80 per

2.2.1Identify the dependent variable in the investigation. (1\

2.2State TWO factors that should have been kept constant during the investigation. The results of the first 8 genera tions in the investigation were as follows:

2.2In terms of natural selection, explain why the average starvation resistance time the fruit flies is different in each generation

2.3.5How long did it take to evolve from the average height of 0,6 m to the present average height What would have been the advantage of tall height as the environment changed to grassland? How many times did the height of the horse increase

Q3— Section header —

3.1Read the passage below and answer the question that follows. Panama is a narr ow s trip of land that joins North and South America. narrow strip of land formed approximately 3 million years ago. hrimps

3.2The diagrams below represent some of the parts found in two different organisms organism A and organism

3.2.4Which pelvis ( or \ represents that of a non human primate? Identify the structure marked

Q3— Section header —

3.2Redraw the table below and u the information in the diagrams above to m atch the characteristics of the different parts

3.3(a\ (b\ (c\ Identify the diagram that has a vestigial structure Explain why it is called vestigial structure Descr

3.3.2(a\ Which diagrams represent structures that are nalogous (b\ Which diagrams represent structures that are omologous Give a reason for your answer

Q3— Section header —

Q4— Section header —

4.1Despite a great increase in the demand for food, only 7% more land is now needed for farming. One o f the reasons for this increased productivity of food a higher yield per hectare, due to

4.1.2Describe how the use of pesticides could destroy food chains. Describe how fertilisers cause eutrophic ation when they are washed into rivers (2\ (5\

4.2State THREE management strategies that a municipality can use to reduce carbon dioxide pollution

4.3The table b elow shows the statistic concerning rhino poachi ng in South Africa from 2005 until April 2012 . Study it and answer the questions that follow.

4.3Draw a line graph to present the data n the table above from 2005 until 2011 What is the estimated number of rhinos that were killed every month in 2011

4.4A Western Cape gam e reserve owner injected the horns of two fem ale rhino with a chemical containing three substances in a bid to prevent poaching. The t hree substances

Topics Identified

GeneticsEvolutionEcology

Mark Allocation

Total150 marks

Key Information

Contact Number0000000000

Paper information

SubjectLife Sciences version 1

Year2012

SessionNovember

TypePast Paper

PaperPaper 2

LanguageEnglish

Pages16

Downloads8

Examination context

Decade2010s

Years ago14y

SeasonSpring (SH)

Start dayMonday

Exam periodNovember 2012

Days since exam5,103

About Life Sciences version 1 examination preparation

Grade 12 Life Sciences combines biological knowledge with interpretation and scientific reasoning. Paper 1 covers molecular biology, genetics, and cell biology, while Paper 2 tests human physiology, ecology, and evolution.

Every available Grade 12 Life Sciences past paper and memorandum is collected in the Life Sciences hub at life-sciences.freemode.co.za — browse all years, sessions and languages in one place.

How to use this resource for revision

A past examination paper is most useful when it is treated as an active revision exercise. Try the questions yourself before checking the corresponding memorandum. Where you make an error, identify the reason — was it a knowledge gap, a calculation mistake, an interpretation issue, or an examination technique problem?

For stronger examination practice, complete the paper without unnecessary interruptions and keep track of the questions that take the most time. Afterwards, review the memorandum and separate knowledge gaps from mistakes caused by interpretation, calculation, structure, or examination technique.

recalling biological concepts

applying knowledge to unfamiliar situations

interpreting diagrams and information

using scientific terminology

constructing precise written responses

A practical revision approach

Life Sciences rewards exact biological terminology — examiners deduct marks for paraphrased definitions. Create a glossary of key terms and practice using them in context.

Grade 12 subject hubs

Each matric subject has its own dedicated hub on Freemode with every past paper and marking memorandum we have archived for that subject.

➗ Mathematics View papers → 📊 Mathematical Literacy View papers → ⚗️ Physical Sciences View papers → 🧬 Life Sciences 📍 You are here 📒 Accounting View papers → 💼 Business Studies View papers → 📈 Economics View papers → 🌍 Geography View papers → 🏛️ History View papers → 📖 English View papers → 🇿🇦 Afrikaans View papers → 🗣️ IsiNdebele View papers → 🗣️ IsiXhosa View papers → 🗣️ IsiZulu View papers → 🗣️ Sepedi View papers → 🗣️ Sesotho View papers → 🗣️ Setswana View papers → 🌾 Agricultural Sciences View papers →

Corresponding marking memorandum

Marking memorandum available

Use the corresponding memorandum after completing the paper to review your answers and identify areas that require further revision. The memorandum shows the marking approach used by DBE examiners, including method-mark allocations.

Life Sciences version 1 English P2 memo →

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