Life Sciences Grade 10 September Test 2018 Paper & Memo

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Downloaded from hlayiso.com Life Sciences 2 September 2018 Common Test Grade 10 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. 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

Downloaded from hlayiso.com Life Sciences 3 September 2018 Common Test Grade 10 SECTION A 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 A. 1.1.1 Endemic organisms ... do not occur naturally in a particular country. are found in a particular country and nowhere else. are those that are introduced into a country. are organisms that occur naturally in a country. when. 1.1.2 The aloe grows on a north-facing slope in the southern hemisphere where itis ... A warm and dry. B warm and moist. C cool and moist. D cool and dry. 1.1.3 Study the characteristics of different kingdoms below. (i) Prokaryotic (ii) Have cells with cell walls (ili) Reproduce by binary fission (iv) Have chlorophyll Which ONE of the following combinations are characteristics of Kingdom Plantae? A (i) and (iii) only B (ii), (iii) and (iv) only C (ii) and (iii) only D (il) and (iv) only Copyright reserved Please Turn Over

Downloaded from hlayiso.com Life Sciences 4 September 2018 Common Test Grade 10 1.1.4 Which ONE of the following is the correct way of writing the scientific name for modern humans? Homo sapiens Homo Sapiens homo sapiens homo Sapiens uUoOUYr 1.1.5 Which ONE of the following CORRECTLY describes Kingdom Protista? BODY STRUCTURE MODE OF NUTRITION A All are multicellular and Autotrophic eukaryotic B All are unicellular and Autotrophic prokaryotes Cc Most are unicellular and Autotrophic or heterotrophic eukaryotic D All are multicellular and Heterotrophic prokaryotic (5x2) (10) TOTAL SECTION A: 10 Copyright reserved Please Turn Over

Downloaded from hlayiso.com Life Sciences 5 September 2018 Common Test Grade 10 SECTION B QUESTION 2 2.1 The diagram below represents a food web. 4 % H * *, . — + » Crab . ; . Octopus aes - poy) Periwinkles Seaweed Limpets Seagull Starfish 2354 Define a food web. 2A oD Why is the seaweed regarded as a producer in this food web? 2.1.3 From the food web, name ONE: (a) Secondary consumer (b) Herbivore (c) Secondary carnivore 2.1.4 Name two decomposers normally present in any ecosystem. 215 Construct a food chain from the food web that contains FOUR trophic levels and includes the periwinkles. 2.1.6 Assuming that the food chain you drew in Question 2.1.5 is the only one that existed in an ecosystem, describe what would happen if all the periwinkles died. BAe Consider the energy flow shown in the food chain below. Copyright reserved Seaweed > Limpets > Starfish > Seagull 97 000kJ 7000kJ 600kJ SOkJ Calculate the percentage of energy that is passed on from the limpets to the starfish. Show ALL working. Please Turn Over (3) (17)

Downloaded from hlayiso.com Life Sciences 6 September 2018 Common Test Grade 10 QUESTION 3 3:1 The graph below shows the results of an investigation carried out to determine the water holding capacity of different soil samples. 30 25 4 20 4 15 10 4 Water holding capacity (ml) Clay Sandy loam Fine sand Coarse sand Silt loam Soil samples 3.1.1 For this investigation identify the: (a) Dependent variable (1) (b) Independent variable (1) Belz What is the water holding capacity of silt loam? (1) 3.1.3 Which soil type has the lowest water holding capacity? (1, 3.1.4 State TWO ways in which the reliability of the investigation can be increased. (2) 3.1.5 Explain the consequence to plant roots if the soil became waterlogged. (3) 3.1.6 Identify TWO factors that should be kept constant in the investigation. (2) (11) 3.2 State TWO advantages of ecotourism. (2) [13] TOTAL SECTION B: 30 Copyright reserved Please Turn Over

Downloaded from hlayiso.com Life Sciences 7 September 2018 Common Test Grade 10 SECTION C QUESTION 4 Describe the nitrogen cycle and the carbon cycle. Content: (17) Synthesis: (3) (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

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Downloaded from hlayiso.com Life Sciences 3 Commo, Grade 10 - Memorandum QUESTION 3 31 384A (a) Water holding capacityY (b) Soil samplesY¥ 3.1.2 25 miv 318 Coarse sandY 3.1.4 - Repeat the investigation’ - Have more than one set up of each soil samplew/use average reading (Mark first TWO only) 3.1.5 - No airy - No oxygen available for respiration’ - leading to rottingy /death of plant roots 3.1.6 - Equal amount of water in each soil typew - Same amount of soil type” - Same apparatus” Any (Mark first TWO only) Improves infrastructure /ouildings/roads - Creates employmenty - Improves the economy” - Protection of the natural environment¥ - New business opportunities” (Mark first TWO only) (Any 2) TOTAL SECTION B: Copyright reserved -t September 2018 (3) (11) (2) [15] 30 Please turn over Life Sciences SECTION C QUESTION 4 The Nitrogen Cycle 4 Grade 10 - Memorandum - Nitrogen-fixing bacteria and lightning ~ - convert Ne into nitrates” - Nitrates absorbed by plants are used to make plant proteins” - which are then consumed by animals and converted into animal proteins”. - Animals release waste products such as urine and faeces” from their bodies - when decomposers break down wastes and dead bot - nitrogen is released into the soil as ammoniaY - Nitrite bacteriaw - convert ammonia into nitritesY” - Nitrate bacteriaw - convert nitrites into nitratesv - Nitrates are absorbed by plants ag; - Denitrifying bacteriav - in the soil convert nitrates into ‘ogen gasv - which is released back into the atmosphere” The Carbon Cycle Common Test September 2018 s of organisms” Any10 (10) - COz produced during respiration” is released into the atmosphere - which is used by plants for photosynthesis” - used to produce organic compounds” - Excess organic compounds are stored” in the plant bodies - When animals consume other plants and animals” - they get their carbon” in this way - They store carbon in their bodies” as proteins, fats and carbohydrates - When plants and animals die, decomposersY break down their bodies - to release the CO2~ stored in them back into the atmosphere - Burning of fos: fuels“ release COQz back into the atmosphere ASSESSING THE PRESENTATION OF THE ESSAY Any 7 (7) Content: (17) Synthesis: (3) (20) Relevance Logic sequence Comprehensive All information provided is relevant to the question Ideas arranged in a logical cause-effect sequence All the information provided is relevant to the: - Nitrogen cycle - Carbon cycle All the information regarding the: - Nitrogen cycle - Carbon cycle is presented in_a logical sequence Answered all aspects required by the essay in sufficient Seta = At least the following points should be included: - Nitrogen cycle 7/10 - Carbon cycle 4/7 4 mark 1 mark 41 mark TOTAL SECTION C: 20 GRAND TOTAL: 60