life sciences Memo 1 (English)

Feb-March 2011 — Grade 12 / Matric — life sciences

Memo 2011 Grade 12 English Life Sciences Hub →

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🎯 150 marks 📄 12 pages 📝 45 items found 📚 2 topics

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Q1— Section header —

1.11.1.1

1.31.3.1

1.3.5/A and B/Both B only B only A only /A and B/Both

1.41.4.1

1.4.3germination of pollen grains Distilled water was used as a control Carry out similar investigations Repeat the investigation

1.21.2.1 Genome

1.2.2DNA profiling

1.2.3Acrosome

1.2.4Ovulation

1.2.5Gestation

1.2.6Vas deferens

1.2.7Prolactin Both A and B /B /B /A Both A and B (5 x 2\ To determine whether sugar does have an influence on the using pollen of other plants

1.51.5.1

1.5.246 /23 pairs Man (1) (1)1

1.5.3One

1.5.4On chromosome pair no. 21 a person with Down's syndrome will chromosomes instead of 2 chromosomes in each cell/47 chromosomes instead of 46 (2\

1.61.6.1 Haemophilia occured in males (2\

1.6.2(a\ SECTION B

Q2— Section header —

2.12.1.1 A - Chromatid

2.1.2(a\

2.1.3Diagram 2, Diagram 3,

2.1.4Meiosis I Meiosis II - No crossing over takes place - No reduction division chromosomes move towards the - During anaphase chromatids (Mark first THREE only\ any 3 x 2 + 1 table (7\

2.1.5Crossing over Pieces of chromatids/gr oups of genes are exchanged between Maternal and paternal chromosomes assort themselves er side of the equator during

2.2

2.2.2AGT

2.2.3Transcription (1\

2.2.4(a\ /have different amino acids

Q3— Section header —

3.13.1.1

3.1.2

3.23.2.1

3.2.2Gossypol acts as a contraceptive Gossypol does not act as a contraceptive in males

3.1.3(a\ The sperms will be prevented from reaching the ovum prevents the ovum from trav elling along the Fallopian The egg produced in the other ovary can still be fertilised in males OR

3.2.3(a\

3.2.4(a\ - Men can also take the responsibility for contraception - Men don't have to use a condom - Control/lower population growth (Mark first TWO only\ - Could have side effects /effects not yet known - Against some people's religion to use contraceptive

3.3.2

3.3.1- A pollen tube - The pollen tube contains the - The tube nucleus/vegetative nu cleus determines the growth of the pollen tube - The pollen tube grows - It enters through the micropyle and opens to release the male

3.3.3(a\ SECTION C

Q4— Section header —

4.1- Reduce the need for the use of chemicals pesticides because the resistance of crops to pests has been increased /less harmful to the - Selecting the best genes to produce better resistant crops - Using specific genes to increase crop yields

4.24.2.1 (a\ O Frequency of human bl from two different cities in RSA ABABO Frequency in population (%\ City 1 City 2

4.3phenotype Black x Black genotype Bb x Bb Meiosis Gametes b x B, b Fertilisation OR genotype BB Bb Bb bb

4.4Advantages of cloning - Producing individuals with desired traits to eliminate unwanted - Better yield - Resistant to diseases to save on the use of pesticides and herbicides - Organisms produced in a shorter time

Topics Identified

Cell BiologyGenetics

Mark Allocation

Total150 marks

Sections30 + 30 + 40 = 100 marks

Per-question sum241 marks

Paper information

Subjectlife sciences

Year2011

SessionFeb-March

TypeMemo

PaperPaper 1

LanguageEnglish

Pages12

Downloads5

Examination context

Decade2010s

Years ago15y

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

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 examination paper

Examination paper available

Open the corresponding examination paper to practise the questions before reviewing the marking memorandum on this page. Attempt every question under timed conditions for the most realistic preparation.

life sciences Paper 1 (English) →

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