Life Sciences Paper 1 (English)

May-June 2019 — Grade 12 / Matric — Life Sciences

Past Paper 2019 Grade 12 English Life Sciences Hub →

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🎯 150 marks 📄 8 pages 📝 55 items found 📚 5 topics 🔑 1 key info

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Q1— Section header —

1.1Various options are provided as possible answers to the following questions. Choose the answer and write only the letter (A to D\ next to the question numbers (1.1.1 to 1.1.9\the ANSWER BOOK, e.g. 1.1.10 D.

1.1Which ONE of the following involves the develop ment of the young inside the uterus of the mother and where it receives nutrients

1.1.3Which part of the eye absorbs excess light Retina

1.1.4Which ONE of the following activities will help to maintain biodiversity in a country? Habitat destruction

1.1.2Below is a list of terms relating to reproduction Which of the terms above refer to strategies used b birds that incubate their eggs in a nest and feed their young until they are

1.1.5AND 1.1.6 ARE BASED ON THE FLOW DIAGRAM BELOW Adrenal Pituitary Thyroid

1.1Which gland secrete ldosterone?

1.1Which ONE of the following is CORRECT with regard to and

1.1During an investigation a man was placed in a airtight room. Sensors were used to monitor his breathing and heart rate. The investigators were able to change the environmental conditions in the room. After 30 min

9.510

10.51900 1925 1950 1975 2000 Average annual temperature ( C\ Year

1.1.8Which ONE of the following is a consequence of the destruction of wetlands

1.1.9The annual average temperatur of a country was recorded over the past 100 years . The information

1.2Give the correct biological term for each of the following descriptions. Write only the term next to the question numbers (1.2.1 to 1.2. \in the ANSWER BOOK.

1.2.9The structures formed by the centrioles during cell division Receptors that provide information about the position of the hea hormone that regulates the water balance in the body A flam

1.3Indicate whether each of the statements in COLUMN I appl ies to A ONLY B ONLY

1.3.1Unfertilised eggs are released from the female s body A: Asexual reproduction B: External fertilisation

1.3.2Plant hormone that helps plant seeds to survive unfavourable conditions e.g. droughts A: Gibberellins B:

1.3.3Hormones secreted by the pituitary gland A: Prolactin B: Growth hormone (6\ (3 x 2\ Life Sciences/P1

1.4The diagrams below show the response of the human eye to two different conditions

1.4.1Identify part (a\ (b\ (c\

1.4.4Identify the process in iagram Name the part of the eye that is responsible for the response in

1.5The diagram below represents an endocrine gland and the events that take place in the ovary during the menstrual cycle in humans.

1.5.1Identify: (a\ (b\ (c\ (d\ Gland Structure

1.5.3Stat e the effect on the oestrogen levels in the blood if gland stops secreting FSH. State ONE function of LH (1\ (1\

1.6A normal, healthy person was placed in a cold room. After 30 minutes the thermal image shown below was produced . This thermal image indicates the temperature of different parts of the body

1.6.2Which colour, black, grey or white, represents the normal body temperature? State what occur red in each of the following parts

1.6.4Name the part of the brain that is responsible for thermoregulation. State ONE way in which the thermal image would differ if the person was placed in a hot room for 30 minutes. (1\ (1\ (5\ TOTAL SECTION A

Q2— Section header —

2.1The diagram below represent phase of meio sis

2.1.3Identify the phase of meiosis in the diagram above. Draw a diagram to show only the TWO gametes formed from

2.2.4Name the plant growth response to light. State TWO factors that were kept constant during the investigation Give ONE reason why the results of this investigation may be considered to be unreliable. In which apparatus

2.2Explain the effect of the unilateral light on the distribution of auxins in the plant in apparatus

2.2clinostat is a device used to investigate plant growth responses. It has disc that rotates very slowly when the clinostat is switched on. During an investigation on plant responses to light the procedure below was

2.3The graph below shows the speed at which impulses are transmitted along sensory neuron axon of increasing diameter when the axons are myelinated (covered with myelin sheath\d unmyelinated (no myelin sheath present\

2.3.4

2.4TWO types of hearing loss occur in humans: Conductive hearing loss ccurs when sound vibrations cannot be conducted thr ough the outer and middle ear Sensorineural hearing

2.4.1Give the LETTER and NAME of the part that (a\ (b\ ransmits impulses to the brain

2.4.2Give only the LETTER of TWO structures i n the diagram of the ear that, when damaged, would result in the following

2.4.3

2.4.4

2.4.5 Middle ear infections are a common cause of hearing loss. State ONE way in which middle ear infections are treated. Name the part of the ear where ear wax is produced.

Q3— Section header —

3.1.2

3.1.4Describe the process of spermatogenesis in part Test results show that a man has a low sperm count. Explain why doctor would advise the man to wear underwear

3.2Maize was genetically modified (GM\ to increase its resistance to insects. This GM maize was introduced in to

3.2.4Give a definition for food security Name TWO arming practices other than growing GM foods

3.3.1

3.3.2 Give only the LETTERS of the TWO parts i n the diagram where

3.3.3 3. .4 Explain why a woman who had her allopian tube removed

3.4.1

3.4.2

3.4.3 Name TWO methods that could be used to reduce the alien plant population Explain how the alien plant invasion will negatively affect the availability of clean water for the surrounding

Q4— Section header —

Topics Identified

Cell BiologyGeneticsEcologyHuman PhysiologyPhotosynthesis

Mark Allocation

Total150 marks

Sections40 + 40 = 80 marks

Key Information

Websitewww.quora.com

Paper information

SubjectLife Sciences

Year2019

SessionMay-June

TypePast Paper

PaperPaper 1

LanguageEnglish

Pages18

Downloads6

Examination context

Decade2010s

Years ago7y

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 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 1 (English) →

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