life sciences Paper 2 (English) version 1

Feb-March 2012 — Grade 12 / Matric — life sciences

Past Paper 2012 Grade 12 English Life Sciences Hub →

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🎯 150 marks 📄 15 pages 📝 57 items found 📚 3 topics 🔑 2 key info

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Q1— Section header —

1.1.6

1.1Various options are given as possi ble answers to the following questions. Choose the correct answer and write onl y the letter (A to D\ question number (1.1.1 to 1.1.5\ your ANSWER BOOK, for example

1.1.1Macroevolution is an increase in the size of indi viduals of a population over a the process leading to the fo rmation of new genera and a gradual change in the number of species found in the fossil changes that can be seen without the need for a microscope.

1.1.2Two individuals are most likel y members of the same species

1.1.3

1.1.4One way to determi ne the age of a fossil is to use the rate of decay of carbon-14. The graph below shows how carbon-14 decays over A fossil snail was found to have 30% of its carbon-14 remaining. According to the above graph, the age of the fossil is

1.1.5The following steps occur duri a result of excess use of fertilisers: 1. Aquatic algae grow rapidly 2. Bacteria use up oxygen 3. Excess nitrates and phosphates discharged into the river 4. Dead algae decomposed by bacteria

1.2.6Waste that cannot be brok en down by decomposers Species that are no longer found on Earth developed and have no useful function

1.2Give the correct biological term for each of the followin g descriptions. Write only the term next to the question number (1.2.1 to 1.2.6\

1.2.1A study of species in similar biomes across the world Structures inherited from the ancestor that are small, poorly The variety of different species living in an area

1.3Indicate whether each of the statements in COLUMN I applies to BOTH A AND B NONE of the items in COLUMN II. Write A only B only both A and B or none

1.3.1Organisms have an in

1.3.2Comparative embryo logy A: Notochord

1.3.3Australopithecines that were found in South

1.3.4Dating of fossils by comparing the age of

1.3.5Evidence for evolut biochemistry A: Different metabolic pathways

1.3.6Reproduction between

1.3.7Influenced by environm ental change A: Speciation (7 x 2\

1.4vertebrate classes (fish, amphibians, r between the two lines in each class gives an indication of the number of species. (million years ago) Vertebrate fossils

1.4.4present? mammals during the Tertiary Period. Name TWO vertebrate classes that evolved first. related.

1.4.1During which geological period were the most species of reptiles Describe the changes in the num ber of species of reptiles and Use the information in the diagram to explain which TWO of the three classes (birds, reptiles and mammals\

1.5Escherichia coli chemical indicator is used. E. coli is present.

1.5.5when conducting this investigation. Give ONE reason for incubating the sample at 37 C. Which river(s) (

Q1— Section header —

Q2— Section header —

2.1.5increases. Explain why lichens do not grow in industrial areas. change if pollution is reduced in the industrial area.

Q2— Section header —

2.1Lichens are small, light-coloured organisms that can be used as pollution indicators. They generally flourish in rura l areas but do not appear in industrial areas which are normally near the ci ty centre. The graph below shows the

2.1.1At what distance from the city c entre is the number of white moths and dark moths and lichens the same? Describe the relationship between the distribution of lichens, dark moths and white moths as the di

2.2.6Name the independent variable in this investigation. must be kept constant dur ing this investigation. concentration?

2.2

2.2.1Formulate a possible hypothesis for this investigation. Name TWO factors which might affect seed germination and which Why was the investigation repeated five times at each Calculate What evidence from the results in the table shows that sodium

2.3.2Which evolutionary process is r epresented by the above diagrams? Use the diagrams

2.3population of cactus plants on which bucks feed over a period of time.

2.3.1and above to explain the process

Q2— Section header —

2.3Below is a sequenc e of diagrams ( and 1'Q*&GC&@++&m EH4.!A*&T&'+8|&

Q3— Section header —

3.1.2What do you understand by the concept homologous Explain ONE way in which the bat's limb is adapted for locomotion. (2) (2) (4)4

3.1.1Digits Bat Thin membrane Humerus Humerus Radius Radius Ulna Ulna Carpals Digits Digits Claws follow.

3.2.5respectively. Tabulate FOUR observable differ organisms

Q3— Section header —

3.2The diagrams below represent the sku lls of two organism s, a modern human and a gorilla. Each arrow indicates t he position of the foramen magnum. Study the diagrams, which ar e drawn to scale, and answer the questions that

3.2.1Identify each of the organism s that are represented by and ences between the skulls of Explain TWO possible advantages of bipedalism for the organism Name any ONE similarity between organisms and which is a

3.3Based on fossil evidence we know t hat dinosaurs became extinct nearly 65 million years ago. The age of fossils can be det uranium. The half-lif e of carbon-14 is 5 730 years and the half-lif e of uranium

3.4.4chimpanzees shared a common ancestor. Which common ancestor ( gorillas?

3.4The diagram below shows a phylogenet ic tree based on DNA similarities. The percentage next to each branch shows the number of differences in the the two groups being compared.

3.4.1From the diagram, determi ne how long ago humans and or \ shared by gibbons and What is the DNA similarity between the genomes of the Pygmy chimpanzee 40 35 30 25 20 15 10 5

Q4— Section header —

4.1.3information in the table above. over the eight years. over-exploitation of resource s such as herring and cod.

4.1The table shows the average number of two types of fish, herring and cod, Year Herring Cod 1 370 145 2 150 120 3 110 80 4 105 60 5 85 50 6 70 45 7 65 50

4.1.1Plot TWO line graphs, on the same set of axes, using the Describe how the catch per net of the herring population changed State any TWO management strategi es which could prevent the NSC

4.2.3potato. African potato. potato. (2)2

4.2Study the passage below and answe r the questions that follow. The African potato ( Hypoxis hemerocaluidea medicine in South Africa and regarded as a natural resource. It is commercially used to cure human ailm

4.2.1Name TWO medical conditions that can be treated with the African State THREE strategies to prevent exploitation of plants like the State TWO consequences of exploita tion of plants like the African

4.3Explain FOUR strategies you would use to manage solid waste if you were al division of your town/city. Content NOTE: NO marks will be awarded fo r answers in the form of flow charts or diagrams.

Topics Identified

Cell BiologyGeneticsEvolution

Mark Allocation

Total150 marks

Sections30 = 30 marks

Per-question sum266 marks

Key Information

Contact Number0 204060801

Websitewww.kznwildlife.com

Paper information

Subjectlife sciences

Year2012

SessionFeb-March

TypePast Paper

PaperPaper 2

LanguageEnglish

Pages15

Downloads5

Examination context

Decade2010s

Years ago14y

Season—

Start day—

Exam period—

Days since exam—

About life sciences 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

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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 Memo 2 (English) version 1 →

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