# Life Sciences Grade 11 NSC Prelim 2023 Paper & Memo > Grade 11 Life Sciences question paper and memo from the NSC Prelim Exam 2023, 12 pages. Read online or get the free PDF download. - Page: https://www.hlayiso.com/library/kzn-life-sciences-grade-11-september-2023-qp-and-memo/5cd8ebb9-a204-4f7c-87a1-46dc4d3347f7 - Updated: 2026-09-27 - Subject: Life Sciences - Grade: Grade 11 - Document type: Question paper and memo - Year: 2023 - Exam period: NSC Prelim Exam - Curriculum: CAPS - Pages: 12 Breadcrumbs: [Home](https://www.hlayiso.com/) › [Library](https://www.hlayiso.com/library) › [Grade 11](https://www.hlayiso.com/library/grade-11) › [Life Sciences](https://www.hlayiso.com/library/grade-11/life-sciences) › [Life Sciences Grade 11 NSC Prelim 2023 Paper & Memo](https://www.hlayiso.com/library/kzn-life-sciences-grade-11-september-2023-qp-and-memo/5cd8ebb9-a204-4f7c-87a1-46dc4d3347f7) ## About this document Life Sciences · Grade 11 · NSC Prelim Exam · 2023. Question paper and memorandum, 12 pages. Read online or download the PDF. Read it free online on the page above; download the PDF from there. ## Document text Text extracted from the PDF. Layout, diagrams and tables may not survive extraction. ### Page 1 • KWAZULU-NATAL PROVINCE EDUCATION REPUBLIC OF SOUTH AFRICA �------------------ _ _ ____________ ..,�., ,. ,.��---------------- ., - - -------------� � MARKS: 50 TIME: 1 hour of 8 pages. Co ri ht Reserved Please Turn Over ### Page 2 September 2023 Common Test INSTRUCTIONS AND INFORMATION Read the following instructions carefully before answering the questions. 1. questions. 2. Write ALL: nswers in the ANSWER BOOK. 3. Start the answers to each question at the top of a NEW page. 4. Number the answers correctly according to the numbering system used in this question paper. 5. Present your answers according to the instructions of each question. 6. Do ALL drawings in pencil and label them in blue or black ink. 7. Draw diagrams, tables or flow charts only when asked to do so. 8. The diagrams in this question paper are NOT necessarily drawn to scale. 9. Do NOT use graph paper. 10. You may use a non-programmable calculator, protractor and a compass. 11. Write neatly and legibly. Copyright Reserved Please Turn Over ### Page 3 September 2023 Common Test SECTION A QUESTION 1 1.1 Various opt,, are provided as possible answers to the following questions. Choose th a wer and write only the letter (A to D) next to the question number ( o 1.1.3) in the ANSWER BOOK, for example 1.1.4 D 1.1.1 The sequence of processes responsible for the composition of urine and volume of urine is ... A Reabsorption, excretion and ultra-filtration. B Excretion, ultra-filtration and reabsorption. C Excretion, reabsorption and ultra-filtration. D Ultra-filtration, reabsorption and excretion 1.1.2 Which statement best describes the relationship between a parasite and its host? A The host is harmed while the parasite benefits B The parasite is harmed while the host benefits C Both host and parasite benefit D The parasite benefits and the host is not harmed 1.1.3 The blood vessel that transport blood with oxygen and nutrients into the kidney is the ... A Renal artery B Superior vena cava C Pelvis D Renal vein (3 X 2) (6) Copyright Reserved Please Turn Over ### Page 4 September 2023 Common Test 1 .2 Give the correct biological term for each of the following descriptions. Write only the term next to the question number (1.2.1 to 1.2.3)in the ANSWER BOOK. 1.2.2 • rary movement of organisms into or out of an area seasonal changes in resources. 1.2.3 The type of competition between members of different species. (3 X 1) (3) 1.3 Indicate whether each of the descriptions in COLUMN I applies to A ONLY, B ONLY, BOTH A AND B or NONE of the items in COLUMN II. Write A only, B only, both A and B or none next to the question number (1.3. 1 to 1.3.2) in the ANSWER BOOK. COLUMN 1 1 COLUMN II 1.3 .1 A group of organisms of the same A: Population specie OCCUPi1ing the same habitat at th� ame ti e. B: Community r 1.3.2 Doubling of th-e population size at A: Geometric growth different intervals. B: Natality (2x2) (4) Copyright Reserved Please Turn Over ### Page 5 September 2023 Common Test “te SSBtvnloaded from Stanmqeephysies.com 1.4 The diagram below represents excretory system in a human body. 1.4.1 Identify part: (a) A (1) (b) B (1) (c) Cc (1) 1.4.2 Give the LETTER and NAME of the: (a) blood vessel that transports oxygenated blood directly into the kidney. (2) (b) part that collects and stores urine temporarily. (2) (7) Copyright Reserved Please Turn Over ### Page 6 “te S§3ivnloaded from Stanmagephysies.com SECTION B QUESTION 2 2.2 je-Helow relates to symbiotic relationships between different September 2023 Common Test one of the major prey of hyenas. Hyenas-hunt in packs. They take down their prey by biting and dragging it to the ground, because they are fast predators. They tackle prey that are fast runners and are also able to kill an animal too large for one hyena. Zebras are 2.1.1. Give TWO reasons mentioned in the extract why hunting in packs makes hyenas successful hunters. 2.1.2 Name the type of relationship shown between hyenas and zebras? 2.1.3 Zebras live in herds. Explain ONE reason why living in herds is an advantage. 2.1.4 Explain why the chances of the zebra and hyena populations reaching carrying capacity are limited. The table below shows rate and depth of breathing in a healthy individual during a four minute strenuous exercise. Time of Rate of breathing 7 exercise (number of breaths Sete ieee Per (minutes) per minute) 1 15 25 2 25 35 3 33 42 4 45 60 (2) (1) (2) (3) (8) 2.2.1. State the relationship that exist between the time of exercise and the rate of breathing? 2.2.2 Calculate the percentage increase in the depth of brea 1 and 4 minutes? Show ALL your workings. . (1) (2) 2.2.3. Describe the homeostatic mechanism that causes the fate“and depth of breathing to increase during strenuous exercise. (4) (7) TOTAL QUESTION 2: [15] Copyright Reserved Please Turn Over ### Page 7 September 2023 Common Test “te S§3ivnloaded from Stanmagephysies.com QUESTION 3 3.1. A researcher wanted to determine the size of the snail population in a garden. 50 snails were randomly collected. Each snail was marked and then returned to the gardenA week later she caught 75 snails and found that 15 had been marked. 3.1.1. Caleuilate the size of the snail population. Show ALL your cateulations. Formula: P=EXS M P = Estimated total number of snails in the population. F = Number caught and marked in the first catch. S = Number caught in the second catch. M = Number marked in the second catch. (3) 3.1.2 Name the method used above to determine the population size. (1) (4) 3.2 | The graph below shows a comparison between the fertility rates of people in developed and developing countries from 1980 to 2010. The fertility rates of people in developed and developing countries from 1980 to 2010 3,4 27 2,1 18 16 1990 2000 20110 Time (years GDeveloped m Developing 3.2.1 Describe the trend in fertility rate for developed countries: (2) 3.2.2 Tabulate ONE difference between developed and developing countries with regards to life expectancy. (3) (5) Copyright Reserved Please Turn Over ### Page 8 “te S§3ivnloaded from Stanmagephysies.com 3.3. Grade 11 learners conducted a survey using information from statistics to determine the effect of smoking on lung cancer. The procedure for the investigation was as follows: Only males who are regular smokers were selected. All malésiwere of the same age group. All mates-were smokers. The investigation was repeated. The table below shows the result of their investigation. Cigarette smoked daily Risk of lung cancer (%) 15 5 25 15 30 21 35 30 3.3.1 Identify the: (a) independent variable (b) | dependent variable 3.3.2 State TWO factors that were taken into consideration in the selection of participants. 3.3.3 Give TWO reasons why the results at the end of the investigation may be considered reliable. TOTAL QUESTION 3: Copyright Reserved GRAND TOTAL: September 2023 Common Test (1) (1) (2) (2) (6) (15) [50] ### Page 9 Downloaded from Stanmorephysics.com KWAZULU-NATAL PROVINCE EDUCATION REPUBLIC OF SOUTH AFRICA MARKS: 50 TIME: 1 hour This marking guideline consists of 4 pages. ### Page 10 Downloaded from Stanmorephysics.com Life Sciences 2 September 2023 Common Test Marking Guideline-Grade 11 SECTION A QUESTION 1 ar 1.1 aw 1A 42 1.13 “Avv (3 x 2) (6) 2 5 Fa | Excretionv 4.22) Migration’ 1.2.3 Interspecific competition’ (1X3) (3) 1.3 1341 Aonly4Y 1:3.2 A onlyWW (2 x 2) (4) 1.4 1.4.1 (a) renal vein’ (1) (b) kidney v (1) (c) ureter) ¥ (1) 1.4.2 (a)EV - renal arteryY (2) b)DY - urinary bladderY (b) ry (2) (7) TOTAL MARKS SECTION A: 20 Copyright reserved Please turn over ### Page 11 Downloaded from Stanmorephysics.com Life Sciences a September 2023 Common Test SECTION B QUESTION 2 2a 22 24 2:12 2.1.3 2.1.4 2.2.1 2:2:2 2.2.3 Marking Guideline-Grade 11 they can tackle prey too fast for themv “they can capture prey too large for them” [mark first TWO only) (2) Predator-preyY relationship (1) large numbers mean that an individual is less likely to be caught by predatory / prey have a better opportunity to escape as there are many eyes to spot a predator” /as running in herds may reduce the ability of a predator to focus on one individual to attack (2) running in herds intimidates the predatory thus, making the prey less endangeredv/ vulnerable - if the prey numbers increase the predator numbers will increasev - causing the prey numbers to decreaseY (3) - which will cause the predator numbers to decreaseY Any (8) As the time of exercise increase, the rate of breathing also (1) increasesY 60-25 = 35 (2) 35 x 100” 25 140V% - During strenuous exercise the carbon dioxide level in the blood increasesv - Receptor cells in the (carotid) artery in the neck/aorta are stimulatedv - to send impulses to the medulla oblongatav - The medulla oblongata sends an impulse to the breathing musclesY - to contract more activelyY - and increase the rate/depth of breathingy - An impulse is also sent to the heart to beat faster - More carbon dioxide is taken to the lungsv/exhalet (4) - The carbon dioxide levels return to normal 3 Any (7) TOTAL QUESTION 2 15 Copyright reserved Please turn over ### Page 12 Downloaded from Stanmorephysics.com Life Sciences QUESTION 3 3.1 3.1.1 3.2 3:21 3.2.2 3.3 3.3.1 3.3.2 3.3.3 4 September 2023 Common Test Marking Guideline-Grade 11 EXS M on >< OX 75V 15v = 250¥ snails Mark-recapture “method The fertility rate decreased from 1980 to year 2000/ and then increased in year 2010V v Developed countries Developing countries Longer life expectancy Lower life expectancy 2 + 1mark for the table (a) smokingY (b) lung cancer’ Gender V Smokers ¥ were usedV / A large sample size tion was repeated only) TOTAL QUESTION 3 TOTAL SECTION B T ARKS long a Copyright reserved (3) (1) (4) (2) (3) (5) (1) (1) (2) (2) (6) [15] [30] [50] ## Related documents - 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