# Life Sciences Grade 11 September Test 2019 Paper & Memo > Grade 11 Life Sciences question paper and memo from the September Test 2019, 11 pages. Read online or get the free PDF download. - Page: https://www.hlayiso.com/library/lfsc-sept-qp-memo-2019-gr11/5714306a-794b-4d6e-8ed1-5fab8c5bd60e - Updated: 2026-09-27 - Subject: Life Sciences - Grade: Grade 11 - Document type: Question paper and memo - Year: 2019 - Exam period: September Test - Curriculum: CAPS - Pages: 11 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 September Test 2019 Paper & Memo](https://www.hlayiso.com/library/lfsc-sept-qp-memo-2019-gr11/5714306a-794b-4d6e-8ed1-5fab8c5bd60e) ## About this document Life Sciences · Grade 11 · September Test · 2019. Question paper and memorandum, 11 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 Downloaded from hlayiso.com testpapers.co.za ### Page 2 Downloaded from hlayiso.com Life sciences NSC Common Test September 2019 INSTRUCTIONS AND INFORMATION Read the following instructions carefully before answering the questions. 1. Answer ALL the questions. 2 Write ALL the answers 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. i 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 Downloaded from hlayiso.com Life sciences ‘ommon Test September 2019 SECTIONA QUESTION 1 1.1 Various 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 number (1.1.1 to 1.1.5) in the ANSWER BOOK, for example 1.1.6 D. 1.4.4 The effect of thermal pollution in aquatic environments is thatit... A’ lowers the amount of oxygen in water B lowers the amount of carbon dioxide in water C lowers the amount of oxygen for aquatic plants D lowers the amount of carbon dioxide for aquatic animals QUESTION 1.1.2 and 1.1.3 are based on the diagram below 1.1.2 Gas A in the blood is mostly transported... A _ as bicarbonate ions Bas carbhaemoglobin C __ in solution with blood plasma D as oxyhaemoglobin 1.1.3 Identify B and C, respectively. A Biscarbon dioxide and C is blood plasma B_ Bis carbon dioxide and C is red blood cells C Bis oxygen and C is blood plasma D_ Bis oxygen and C is red blood cells Copyright reserved Please turn over ### Page 4 Life sciences 1.1.4 Copyright reserved Downloaded from hlayiso.com Common Test September 2019 An effect of deforestation is that it ... A decreases soil erosion B decreases biodiversity C decreases climate change D decreases carbon dioxide The hormone aldosterone regulates the concentration of ... A waste substances B glucose C sodium ions D° carbonate ions (5 x2) (10) TOTAL SECTION A 10 Please turn over ### Page 5 Downloaded from hlayiso. FON inver2019 Life sciences yJSO, SECTION B QUESTION 2 a1 The diagram below shows a section through a kidney and answer questions that follow E F 24d Name the functional unit of the kidney. (1) 2.1.2 Give the LETTER and the NAME of the part that: (a) encloses and protect the kidney (2) (b) is alarge cavity leading to the ureter (2) (c) is cone shaped and consisting of many ducts collecting urine (2) 2.1.8 Explain the role of ADH in raising the volume of water in the blood. (3) (10) Copyright reserved Please turn over _ ### Page 6 Life sciences Downloadedfrom hlayYiGQ.GQWMWremver 2019 22 Invasive alien plants have become South Africa's worst enemy due to their ability to deplete the country’s water and their effect on biodiversity. 221 What are alien plants? (1) 22:2 State the effect of alien plants on water availability. (1) 2.2.3 Explain the effect of removal of alien plants on the country’s economy. (3) (5) QUESTION 3 South Africa ranked amongst highest in carbon dioxide emission South Africa is counted amongst the top 20 countries with highest recorded carbon dioxide emission. The province of Mpumalanga was identified as the most carbon emitting province in this country owing to a number of coal-fired power stations and industries found in this area. The government is still working on finding ways to decrease the amount of carbon dioxide emitted by this province. 3.1.1 Name TWO activities mentioned in the passage that has led to an increase in the carbon dioxide emissions by Mpumalanga province. (2) 3.1.2 Suggest ONE reason why this province needs to find ways to decrease the carbon dioxide emissions. (1) 3.1.3 Explain ONE other activity not mentioned in the passage that may have contributed to Mpumalanga province having the highest carbon (2) dioxide emission. 3.1.4 Suggest ONE alternative energy source that is less harmful to the (1) environment. (6) [15] Copyright reserved Please turn over ### Page 7 Life sciences Down | oad edfrom h lay ISQsGQID rember 2019 3.2 An investigation was conducted to determine the effect of smoking in males on the risk of lung cancer. The following procedure was followed: Their risk of developing lung cancer was measured and recorded. 40 males were selected to be part of the investigation Only males who regularly smoke were included A\l males were of the same age group The males in the investigation smoke the same type of cigarette The following results were obtained from the investigation. Number of cigarette smoked Risk of lung cancer (%) daily 10 20 20 30 30 55 40 80 More than 40 85 3.2.1 3.2.2 3.2.3 3.2.4 3.2.5 State the independent variable for the investigation. (1) State the hypothesis for this investigation. (2) List TWO ways how the validity of this investigation was increased. (2) Other than repeating the investigation, state ONE way in which the reliability of the results could be increased. (1) Smoking has a potential to destroy cilia in the breathing system. Explain the effect on the breathing system when cilia is destroyed. [15] Copyright reserved TOTAL SECTION B 30 Please turn over ### Page 8 Downloaded from hlayiSQ,GQMemrer 2019 Life sciences SECTION C QUESTION 4 Define food security and discuss the impact of the loss of the of wild crop varieties on the gene pool and the positive effect of genetically engineered foods on food security. Also, discuss the effect of using excess fertilizers on biodiversity in an aquatic ecosystem (17) Content : (3) Synthesis: (20) NOTE: NO marks will be awarded for answers in the form of tables, flow charts or diagrams. TOTAL SECTION C: 20 GRAND TOTAL: 60 Copyright reserved ### Page 9 education Department: Education PROVINCE OF KWAZULU-NATAL LIFE SCIENCES MARKING GUIDELINE SEPTEMBER 2019 NATIONAL SENIOR CERTIFICATE GRADE 11 MARKS: 60 TIME: 41 hour This marking guideline consists of 5 pages. Copyright reserved Please turn over a SECTION A QUESTION 1 14 144 4.4.2 11.3 1.1.4 1.1.5 SECTION B QUESTION 2 24 244 21.2 213 2.2 2.2.4 2.2.2 2.2.3 Copyright reserved om hlayiso.com Life Sciences-Grade 11 NSC-Marking Guideline onwo> x vv (5x2) Nephron” (a) EY renal capsule” (b) CV — pelvis ~ (c) FY - pyramids¥ - ADH increases the permeability of the walls of distal convoluted tubules and collecting tubules” - causing more water to leave the filtrate by osmosis to the medulla’ - from where it is reabsorbed back into the blood capillaries” (any correct THREE) Invasive alien plants are plants not naturally occurring in that areav/ not native but were introduced to an area - They absorb more water decreasingy water availability - Equipment needed to remove these plants” is expensive - more money will be used to buy equipment” /hire people to remove these plants - thus decreasing” the country’s economy Please turn over Common Test September 2019 (10) (1) (2) (2) (3) (10) (1) (3) (5) [15] ### Page 10 3 Life Sciences-Grade 11 NSC-Marking Guideline Common Test September 2019 QUESTION 3 3.1 3.4.1 3.2 3.2.1 3.2.2 3.2.3 3.2.5 Copyright reserved Downloaded from hlayiso.com - Coal power stationsv - Industries” To prevent an increase in atmospheric temperatures~/to prevent global warming/to prevent the enhanced greenhouse effect - deforestation” occurred - decreasing carbon dioxide absorption by plants“ - use of vehicles” /Transport of products - release carbon dioxide into the atmosphereY - coal mines¥ - release carbon dioxide into the atmospherev (mark first ONE explained only) Wind power~/solar panels/wave energy/bio-fuels/natural gas Number of cigarettes smoked daily” Increase in the number of cigarettes smoked daily increase the risk of lung cancer” ¥ Or Increase in the number of cigarettes smoked daily decrease the risk of lung canceryv Or Increase in the number of cigarettes smoked daily has no effect on the risk of lung cancer Vv - only males were used in the sample ” - all males were of the same age group” - all males were regular smokers” - all males were given the same type of cigarette” ( mark first TWO only) By increasing the number of male participants~/use more than 40 participants. - Foreign substances such as dust will not be removed efficiently” - gaseous exchange surface may be infectedv’ - leading to a poor supply of oxygen” Please turn over 4 Life Sciences-Grade 11 NSC-Marking Guideline Common Test September 2019 SECTION C QUESTION 4 (2) Food security - Access by all people” - to enoughy /adequate (1) ~ healthy” /nutritious/quality food - atall times” Any 3 Impact of the loss of wild varieties - Selectively bred crops/ hybrid crops have desirablev characteristics - They are grown in large numbers” /monoculture of the crops - therefore, the wild variety of that crop are decreasing in numbers“/no longer (2) available - When the environment changes”, the selectively bred crops may not adapt” 4 - since the gene pool is decreased, ” { - therefore food security decreaseY Effect of genetically engineered foods - Genetically engineered foods are foods derived from organisms where specific (1) changes are made to their DNAY - Genetically engineered foods are beneficial as they are drought resistant~/ herbicide tolerant/ pest resistant/ disease resistant/ longer shelf life/ etc. - Making more food available” - therefore increasing” food security Any8 Effect of excess fertilizers on biodiversity - Excessive use of fertilizers increases the nutrient content” of the surrounding river/ - Eutrophication occurs” (2) - This causes an overgrowth of algae/ algal blooms” - The algae forms a dense mat which blocks out sunlight” - reducing photosynthesis” - Plants and animals depending on them diew (2) ~ increasing decomposition” - leading to depletion of oxygen” Any 6 - water becomes polluted~ - and reducing biodiversity” (1) Content: (17) Synthesis: (3) (3) (9) 115] Copyright reserved Please turn over ### Page 11 Downloaded from hlayiso.com 5 Life Sciences-Grade 11 NSC-Marking Guideline Common Test September 2019 ASSESING THE PRESENTATION OF THE ESSAY RELEVANCE LOGICAL SEQUENCE COMPREHENSIVE All info rmation provided is Ideas arranged in a Answered all aspects relevant to the topic logical/ cause effect required by the essay in sequence sufficient detail All information is relevant Ideas are presented in a All aspects are answered to: logical sequence with Comprehensively as - food security definition regards to: follows: - wild varieties and GM - food security definition - food security foods - wild varieties and GM definition (2/3) - effect of excess fertilizers foods - wild varieties and GM There is no irrelevant - effect of excess fertilizers foods (5/8) information - effect of excess fertilizers (4/6) 1 mark 1 mark 1 mark NOTE: NO marks will be awarded for answers in the form of tables, flow charts or diagrams. 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