Life Sciences Grade 11 KwaZulu Natal June 2019 Paper & Memo

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Downloaded from hlayiso.com Downloaded from Stanmorephysics.com 1 Life sciences-Grade 11 NSC- Marking Guideline Common Test June 2019 LIFE SCIENCES MARKING MEMORANDUM COMMON TEST JUNE 2019 NATIONAL SENIOR CERTIFICATE GRADE 11 MARKS: 150 TIME: 2½ hours This marking guideline consists of 11 pages. Copyright reserved Please turn over

Downloaded from hlayiso.com Downloaded from Stanmorephysics.com 2 Life sciences-Grade 11 NSC- Marking Guideline Common Test June 2019 SECTION A QUESTION 1 1.1 1.1.1 C  1.1.2 B  1.1.3 C  1.1.4 C  1.1.5 D  1.1.6 B  1.1.7 B  1.1.8 D  1.1.9 B  1.1.10 C  (10 x 2) (20) 1.2 1.2.1 Palisade mesophyll 1.2.2 Ovary 1.2.3 Cephalisation 1.2.4 Asexual 1.2.5 Antibiotics / 1.2.6 Immunity 1.2.7 ATP/Adenosine triphosphate 1.2.8 Greenhouse 1.2.9 Epiglottis 1.1.10 Sessile/sedentary ( 1 X 10) (10) 1.3 1.3.1 B only  1.3.2 A only  1.3.3 B only  1.3.4 None  1.3.5 B only  ( 5 x 2) (10) Copyright reserved Please turn over

Downloaded from hlayiso.com Downloaded from Stanmorephysics.com 3 Life sciences-Grade 11 NSC- Marking Guideline Common Test June 2019 1.4 1.4.1 (a) Kingdom Fungi (1) (b) Kingdom Protista (1) 1.4.2 - Eukaryotic - Decomposers - Heterotrophic/ No chlorophyll - Multicellular, some unicellular - Non-motile - Cell wall  (2) (Mark first TWO only) 1.4.3 (a) - Fungi are used to produce antibiotics (1) (Mark first ONE only) (b) - Production of cheese - Production of beer/ alcoholic beverages - Production of wines/ alcoholic beverages - Production of bread - Production of food/ mushrooms (mark first ONE) (1) 1.4.4 - Fever/ sweating - Chills - Fatigue/ pain - Night sweats - Vomiting - Nausea - Headache - Muscle pain (2) (mark first TWO only ) 1.4.5 - Some protists are photosynthetic - maintain the balance between oxygen and carbon dioxide or - Some protists are decomposers - thus release important nutrients back to the soil or - Some protists are producers - provide a food source for other organisms (2) (mark ONE explained only ) (10) TOTAL MARKS SECTION A: 50 Copyright reserved Please turn over

Downloaded from hlayiso.com Downloaded from Stanmorephysics.com 4 Life sciences-Grade 11 NSC- Marking Guideline Common Test June 2019 SECTION B QUESTION 2 2.1 2.1.1 (a) Receive pollen (1) (b) Produce pollen/ male gamete (1) 2.1.2 - Has a large corolla/ petals - Filaments and stigma are enclosed (2) (mark first TWO only ) 2.1.3 (a) Sporophyte (1) (b) Gametophyte (1) 2.1.4 a) Seta (1) b) Stem (1) c) Rhizoid (1) 2.1.5 - Poorly developed vascular system - Sexual reproduction is dependent on water (2) (mark first TWO only ) (11) 2.2 2.2.1 (a) Growth of bacteria/ the diameter of the area with no bacterial (1) growth (b) - Same strain of bacteria - Same amount of bacteria in all the petri dishes - Same amount of agar medium - ALL measurements of the diameter should be done by the same person/instrument/ using the same instrument (3) (Mark first THREE only) 2.2.2 To increase the reliability of the results  (1) 2.2.3 To verify that any difference in bacterial growth is due to the action of Vibramycin/ acts as a control (1) Copyright reserved Please turn over

Downloaded from hlayiso.com Downloaded from Stanmorephysics.com 5 Life sciences-Grade 11 NSC- Marking Guideline Common Test June 2019 2.2.4 (a) - An increase in the concentration of Vibramycin antibiotic will increase bacterial growth OR - An increase in the concentration of Vibramycin antibiotic will decrease bacterial growth OR - An increase in the concentration of Vibramycin antibiotic will have no effect on bacterial growth (2) (b) Concentration of Vibramycin (1) (9) 2.3 2.3.1 Triploblastic (1) 2.3.2 Both organisms have a body plan derived from three germ layers/ ectoderm, endoderm, mesoderm. (1) 2.3.3 Bilateral (1) 2.3.4 Arthropoda;Chordata;Annelida (any2) (2) ( Any first TWO only) (1) 2.3.5 Endoderm 2.3.6 - Separates gut wall from the body wall allowing more efficient digestion of food/ allowing the body wall to function independently to gut wall - Provides a hydrostatic skeleton which assist in movement and efficient circulation of nutrients and removal of wastes - Coelom provides space for the development of specialised internal organs - Coelomic fluid cushionsthe internal organs protectingthem from injury (4) ( mark first TWO explained only) (2x2) (10) 2.4 2.4.1 Exoskeleton (1) 2.4.2 - Hydrostatic skeleton - endoskeleton ( mark first TWO only) (2) (3) Copyright reserved Please turn over

Downloaded from hlayiso.com Downloaded from Stanmorephysics.com 6 Life sciences-Grade 11 NSC- Marking Guideline Common Test June 2019 2.5 2.5.1 2018 (1) 2.5.2 8 - 6 = 2 x 100  6 (2) =33.3% reported cases 2.5.3 Rabies cases increased from 2014 to 2015 and decreasedin 2016 and increased again from 2017 to 2018 (3) 2.5.4 2017 and 2018 (1) (7) TOTAL QUESTION 2 40 QUESTION 3 3.1 3.1.1 A – gall bladder (1) C – stomach (1) E – small intestine (1) F – large intestine (1) 3.1.2 - Has muscles which forces the bolus down to the stomach - Has goblet cellsin its wall which secrete mucus which serve to lubricate the walls for the passage of the bolus. (2) ( mark first ONE explained only) (1x 2) 3.1.3 Diabetesmellitus (1) 3.1.4 - The cells of the islets of Langerhans/pancreas/part D - secrete more glucagon into the blood - glucagon acts on the liver/part B and stimulate the conversion of stored glycogen to glucose - The blood glucose level increasesback to normal (5) (12) Copyright reserved Please turn over

Downloaded from hlayiso.com Downloaded from Stanmorephysics.com 7 Life sciences-Grade 11 NSC- Marking Guideline Common Test June 2019 3.2 3.2.1 Graph showing the effects of temperature on the rate of photosynthesis in a plant species 25 RATE OF PHOTOSYNTHESIS 20 15 (arbitrary units) 10 5 0 15 20 25 30 35 TEMPERATURE 0C criterion Elaboration Mark Type of Line graph drawn 1 graph Caption Includes both variables 1 X-axis Correct label of X- axis (temperature) and 1 appropriate scale Y-axis Appropriate scale AND correct label and units 1 for Y-axis Plotting of 1-4 points plotted correctly- 1 mark 2 points All 5 points plotted correctly-2 marks (6) 3.2.2 Enzymes controlling the process are inactive at low temperature (1) 3.2.3 - Other factorsof the process may be in short supply / limiting - A large increase in the concentration of carbon dioxide could affect the pH of the cellwhich may not be optimum for enzymes controlling this process (4) ( mark first TWO only) (2 X 2) (11) Copyright reserved Please turn over

Downloaded from hlayiso.com Downloaded from Stanmorephysics.com 8 Life sciences-Grade 11 NSC- Marking Guideline Common Test June 2019 3.3 3.3.1 Phylogenetic tree /cladogram (1) 3.3.2 Palaeozoic  (1) 3.3.3 Vascular tissue  ( mark first ONE only) (1) 3.3.4 They both produce seeds 3.3.5 Pteridophytes  (1) 3.3.6 Pteridophytes share the most recentcommon ancestor with (1) angiosperms than bryophytes 3.3.7 - seeds remain dormant until they are needed for replanting (2) since they are stored under low temperatures - seed banks provide conditions necessary for longevity  of seeds - plants can be stored in their seed formsince they are small therefore occupy minimum space - availability of genes in seeds for plant breeders/genes to increase yield/ genes to resist diseases ( Mark first TWO only ) (2) (9) Copyright reserved Please turn over

Downloaded from hlayiso.com Downloaded from Stanmorephysics.com 9 Life sciences-Grade 11 NSC- Marking Guideline Common Test June 2019 3.4 3.4.1 Anaerobic (1) 3.4.2 - It takes time for oxygen debt to be repaid - more oxygen needed for lactic acid to be broken down / converted to energy (2)  3. 4.3 Aerobic Respiration Anaerobic Respiration Occurs when oxygen is present Occurs when oxygen is absent in cell in cell Starts in the cytosol and ends in Occurs in cytosol mitochondria One glucose molecule releases One glucose molecule 38 ATPs / more energy releases 2 ATPs / less released energy released ATP, CO2 and water are the ATP, CO2 and ethanol are the products in both plant and products in plant cells. animal cells ATP and lactic acid are the products in animal cells (Mark first TWO only) Any 2 x 2 + 1 for table (5) (8) TOTAL QUESTION 3 40 Copyright reserved Please turn over

Downloaded from hlayiso.com Downloaded from Stanmorephysics.com 10 Life sciences-Grade 11 NSC- Marking Guideline Common Test June 2019 SECTION C QUESTION 4 Dark phase of photosynthesis - It takes place in the stroma of the chloroplast - Carbon dioxide from the atmosphere - combines with energy rich hydrogen  atoms from the light phase - using energy from ATP - to form carbohydrates/glucose/ starch - The reactions are controlled by enzymes Any 5 Testing a leaf for the presence of starch - Boil the leaf in water - Boil the leaf in alcohol - Rinse in water - Pour a few drops of iodine solution onto the leaf - If the leaf turns blue-black/ black - It indicates the presence of starch - If it turns brown Any 5 - It indicates the absence of starch Mechanical breakdown of carbohydrates - Carbohydrates broken down to smaller size - by teeth/ through mastication/ chewing - and stomach which churns food - to become a liquid called chyme - and by peristalsis Chemical digestion of carbohydrates - Carbohydrases in the - saliva  - pancreatic juice - intestinal juice - break down the polysaccharides - to disaccharides - and eventually to monosaccharide’s Any 7 - in an alkaline medium Copyright reserved Please turn over

Downloaded from hlayiso.com Downloaded from Stanmorephysics.com 11 Life sciences-Grade 11 NSC- Marking Guideline Common Test June 2019 ASSESING THE PRESENTATION OF THE ESSAY RELEVANCE LOGICAL SEQUENCE COMPREHENSIVE All information 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 Comprehensively as - Dark phase Sequence with regards to: follows: - Effect of temperature - Dark phase - Dark phase (3/5) - Digestion - Effect of temperature - Effect of temperature There is no irrelevant - Digestion (3/5) information - Digestion (5/7) 1 mark 1 mark 1 mark NOTE: NO marks will be awarded for answers in the form of tables, flow charts or diagrams. TOTAL SECTION C: 20 GRAND TOTAL: 150 Copyright reserved Please turn over