Life Sciences Grade 11 KwaZulu Natal June 2017 Paper & Memo

Education KwaZulu-Natal Department of Education Ath ARMA RRA E RIND, PERE EAEDPRRARAEAIAREEAASEA RELI AERA REL SRES RSD ABEL ELIMAREASEEAE | LIFE SCIENCES JUNE 2017 COMMON TEST MARKS: 150 TIME: 2% hours This question paper consists of 15 pages. Copyright reserved

Downloaded from hlayiso.com Life Sciences Grade 11 June 2017 Common Test INSTRUCTIONS AND INFORMATION Read the following instructions carefully before answering the questions. 1. 2. 10. 11. Answer ALL the questions. Write ALL the answers in your ANSWER BOOK. Start the answers to EACH question at the top of a NEW page. Number the answers correctly according to the numbering system used in this question paper. Present your answers according to the instructions of each question, Make ALL drawings in pencil and label them in blue or black ink. Draw diagrams, flow charts or tables only when asked to do so, The diagrams in this question paper are NOT necessarily drawn to scale. Do NOT use graph paper. You may use a non-programmable calculator, protractor and a compass, where necessary. Write neatly and legibly.

Downloaded from hlayiso.com Life Sciences Grade 11 June 2017 Common Test SECTION A QUESTION 1 11 Various options are provided as possible answers to the following questions. Choose the correct answer and write only the letter (A to D) next to the question number (1.1.1 to 1.1.10) in your ANSWER BOOK, for example 1.1.11 D. 1.14 The dominant generation of the mosses and the angiosperms respectively, is .., A gametophyte and sporophyte. B sporophyte and gametophyte. C sporophyte and sporophyte. D — gametophyte and gametophyte. 1.1.2 The diagram below represents the reproductive structure of a plant group that you have studied. Which plant group has the above reproductive structure? A Bryophytes B Pteridophytes Cc Gymnosperms D Angiosperms 1.1.3 Bacteria that convert light energy to chemical potential energy stored in organic compounds, are called ... A heterotrophic bacteria. B denitrifying bacteria. C autotrophic bacteria. D __nitrogen-fixing bacteria.

Life Sciences 1.1.4 Downloaded from hlayiso.com Grade 11 June 2017 Common Test Study the list of characteristics below. (i) (ii) Gil) (iv) (v) Coelomate and triploblastic Acoelomate and asymmetrical Diploblastic Bilateral symmetrical Radially symmetrical Which ONE of the following applies to the Cnidarians? A (i), (ii) and (iv) only B_ (iii) and (v) only C (iv) and (v) only D _{iv) only The grade 11 learners conducted an investigation to compare the effect of three antibiotics on the growth of the bacteria. They set up agar plates containing nutrients and bacteria. Sterile discs (1, 2 and 3) containing three different antibiotics were then placed in each of the plates. The dots represent the bacteria. The results of the investigation are represented in the diagram below. Agar plates Agar plates Antibiotic + Antibiotic 2 Antibfotic 3 From the above it can be concluded that the bacteria are ... A __ least resistant to antibiotic 1. B least resistant to antibiotic 2. C least resistant to antibiotic 3. D not affected by the antibiotics. Micro-organisms that have a cell wall, no chlorophyll and reproduce by spores belong to the kingdom ... A Fungi. B Plantae. C sProtista. D ~~ Monera.

Downloaded from hlayiso.com Life Sciences Grade 11 June 2017 Common Test 1.1.7 Organisms that obtain their food from dead remains of plants or animals are called ... A producers. B __heterotrophs. C parasites D _ saprophytes ; 1.1.8 Which group of micro-organisms fix nitrogen in the roots of some plants and obtain nutrition in return? A Fungi | B Protists Cc Bacteria | D Viruses ' 1.1.9 The elimination of undigested food and indigestible material from the body is known as ... A __ ingestion. : B absorption. \ C egestion. | D assimilation. 1.1.10 A condition of malnutrition resulting from eating too much of the high-energy foods such carbohydrates and fats is ... A _ bulimia. B anorexia. C obesity. D __kwashiorkor. (10 x 2) (20)

Life Sciences 1.2 1.3 Downloaded from hlayiso.com Grade 11 + June 2017 Common Test Give the correct biological term for each of the following descriptions. Write only the term next to the question number (1.2.1 to 1.2.9) in your ANSWER BOOK. 1.2.1 1.2.2 1.2.3 1.2.4 1.2.5 1.2.6 1.2.7 1.2.8 1.2.9 The type of respiration that occurs in the presence of oxygen The rhythmical contractions of the muscles of the alimentary canal causing food to move along the gut The digestive juice which has no enzymes Organisms consisting of a cell or cells in which the genetic material is contained within a distinct nucleus A disease-causing organism A method of asexua! reproduction where unicellular organisms simply splits into two The micro-organism that causes malaria A part of the alimentary canal that serves as a passage for both air and food A plant with no true roots, stems and leaves (9x 1) Indicate whether each of the statements in COLUMN | 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 1.3.4) in the ANSWER BOOK. COLUMN | COLUMN Il 1.3.1 The products of final digestion in the gut | A. Proteins B. Lipids 1.3.2 Animals without back bones A. Invertebrates : B_ Vertebrates 1.3.3. A biological agent that can only A. Protist reproduce inside the cell of a living B. Virus organism 1.3.4 Micro-organisms used in medical A. Fungi biotechnology B. Bacteria (4x 2) (9) (8)

Life Sciences Downloaded from hlayiso.com Grade 11 June 2017 Common Test 1.4 The diagrams below represent the reproductive structures of a plant studied. 1.4.1 1.4.2 1.4.3 1.4.4 Provide labels for parts 1 and 2. What is the most likely pollinating agent for the above flower. Give ONE observable reason for your answer in QUESTION 1.4.2 After fertilisation the ovule becomes the seed. Explain ONE advantage of seeds over spores. (2) (1) (2) (6)

Life Sciences Downloaded from hlayiso.com Grade 11 . June 2017 Common Test 1.5 The diagram below shows the gut in an animal from one of the phyla you have studied. 1.5.1 1.5.2 1.6.3 1.5.4 State whether the animal has a blind gut or a through gut. Explain ONE advantage of the gut mentioned in 1.5.1. Name TWO phyla that have animals with a gut like the one in the diagram. State what is meant by cephalisation. TOTAL SECTION A: (1) (2) (2) (2) (7) 50

Life Sciences SECTION B QUESTION 2 2.1 Downloaded from hlayiso.com Grade 11 June 2017 Common Test The diagram below represents the human digestive system, Give the LETTER/S and the NAME/S of the part/s which: (a) Contain or secrete enzymes which act upon carbohydrates (b) Secrete hydrochloric acid (c) is made up of the caecum, colon and rectum State TWO functions of the liquid stored in part B. Explain TWO structural adaptations of a villus found in part F. State why gland E is regarded as both endocrine and exocrine. Describe how the hormone secreted by the pancreas regulates the blood glucose level when it drops below normal. (2) (2) (2) (4) (2) (4) (20)

Life Sciences Downloaded from hlayiso.com Grade 11 June 2017 Common Test 2.2 The diagram below represents an organism in one of the phyla of the kingdom Animalia. Locust 2.2.1 Identify the phylum to which the locust belongs. 2.2.2 State whether the locust is dip/oblastic or triploblastic animal. 2.2.3 Name the type of skeleton found in a locust. 2.2.4 State TWO disadvantages of the type of skeleton mentioned in 2.2.3 and explain how the locust overcomes each of these disadvantages. 2.2.5 Explain why a blood system is necessary in coelomate organisms such as the locust. (1) (1) (4) (2) (9)

Downloaded from hlayiso.com Life Sciences Grade 11 June 2017 Common Test 2.3 Read the extract below and then answer the questions that follow. Most important of the tropical diseases Malaria has been called the ‘most important’ of the tropical diseases by World Health Organisation (WHO, 1990). It leaves a heavy toll of illness and is lethal, especially to the children. It poses a risk to business travels, tourists and immigrants. Imported cases of malaria are increasingly seen in non-endemic area such as Europe and North America. In many parts of Africa people are infected so frequently that they develop a degree of acquired immunity, and may become ‘asymptomatic’ carriers of the infection. Epidemics are most frequent in rural areas. The global distribution is mostly concentrated near the equator. 2.3.1 | Name the vector of malaria. 2.3.2 List TWO symptoms of malaria. 2.3.3 Suggest TWO reasons for the high incidence of malaria infections in Central Africa. 2.3.4 Give ONE reason why malaria poses a risk to the business travellers. 2.3.5 Describe how acquired immunity is achieved. 2.3.6 Define the term asymptomatic as used in the passage. (1) (2) (2) (3) (2) (11) [40]

Life Sciences QUESTION 3 3.1 Downloaded from hlayiso.com Grade 11 June 2017 Common Test The diagram below represents a phylogenetic tree of different groups of plants. > Origin of land plants : Early vascular plants According the phylogenetic tree, which group gave rise to all the other groups. In which era did the angiosperms first appear? Which characteristic separates the bryophytes from charophyceans? How long ago did the progymnosperms become extinct? Tabulate any TWO differences between the gymnosperms and the angiosperms with regards to reproduction. Are the mosses or angiosperms more closely related to the gymnosperms? Explain your answer in QUESTION 3.1.6. Angiosperm plants undergo sexual and asexual reproduction. Explain TWO advantages of sexual reproduction for the survival of plants. (1) (1) (2) (5) (1) (2) (4) (17)

| | Downloaded from hlayiso.com Life Sciences Grade 11 dune 2017 Common Test 3.2 A grade 11 learner conducted an investigation to determine whether chlorophyll is necessary for photosynthesis using a variegated leaf. Part A is white and part B is green. Variegated leaf 3.2.1 Why should the plant be destarched before a leaf can be tested for starch. (2) 3.2.2 State the colour of Part A after the starch test. (1) 3.2.3 Explain the various steps the learner will follow when testing for starch in the leaf of the plant. (6) 3.2.4 Drawa labelled diagram ofa chloroplast. (4) (13)

Downloaded from hlayiso.com Life Sciences Grade 11 June Examination 2017 3.3. The graph below shows the results of an investigation to determine the effect of light. intensity on the rate of photosynthesis. The effect of light intensity on the rate of photosynthesis = Nn oy fo} con) Number of bubbles given off in 1 minute 1 0,5 0,25 0,125 Distance. between a water plant and light source (m) 3.3.1. Formulate a hypothesis for this investigation. (2) 3.3.2 How was the rate of photosynthesis measured in this investigation? (1) 3.3.3 Identify the gas released in this investigation. (1) 3.3.4 How many bubbles were released per minute when the light source was 0,5 m from the water plant? (1) 3.3.5 The number of bubbles given off remained the same even though the light intensity increased when the light was moved from 0,25m to 0,125m.. Provide an explanation for the above observation. (2) 3.3.6 State THREE factors that should be kept constant in this investigation. (3) 0 TOTAL SECTIONB: 980

Downloaded from hlayiso.com Life Sciences Grade 11 June 2017 Common Test SECTION C QUESTION 4 Carbon dioxide is required in the dark phase of photosynthesis but is released during the Kreb’s cycle of cellular respiration. Describe the dark phase of photosynthesis and Kreb’s cycle of respiration and then explain the structural adaptations of the mitochondria for respiration. CONTENT: (17) SYNTHESIS: (3) (20) NOTE: NO marks will be awarded for answers in the form of flow charts, tables or diagrams. TOTAL SECTION C: 20 GRAND TOTAL: 150

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® Downloaded from hlayiso.com 3 4 Life Sciences Grade 11 ~ Marking Guideline June 2017 Common Test Life Sciences Grade 11 — Marking Guideline June 2017 Common Test | 14. — If only letter is asked for and oniy name is given (and vice versa) SECTION A No credit 7 QUESTION 1 15. If units are not given in measurements. . Candidates will lose marks. Memorandum will allocate marks for units separately 14 144A AVY 4.1.2 BYY 16. Be sensitive to the sense of an answer, which may be stated in a different way. 4.1.3 Cy 1.1.4 BYY 17. Caption . 4.15 Cy All illustrations (diagrams, graphs, tables, etc.) must have a caption 4.1.6 AMY 147 DYv 18. Code-switching of official languages (terms and concepts) 1.1.8 oy A single word or two that appears in any official language other than the learners’ 1.1.9 Cy assessment language used fo the greatest extent in his/her answers should be credited, 1.110 Cvv (10x2} (20) if it is correct. A marker that is proficient in the relevant official language should be consulted. This is applicable to all official languages. 1.2 1.2.1 Aerobic respiration 1.2.2 Peristalsis” 1.23 Bilev” 124 Eukaryotes“/eukaryotic 1.25 Pathogen” 1.2.6 Binary fission” 1.27 Plasmodium” 128 Pharynx” 129 — Thallus¥ . @) | 13° 134 Nonevv 1.3.2 Aonlyv¥” 1.3.3 Bonly~” noe 43.4 BothAand BYY (4x2) (8) V4 1.41 A-AntherY B- Stigmay @) 142 Wind ¥ (1) 14.3 - Nopetals” i - Large anther” - Feathery stigma” - Long filaments” Mark first ONE only Any (1) 14.4 - Seeds have more food than spores¥ ! - and can therefore survive longer” - Seeds are dispersed in many ways” - whereas spores are dispersed by wind only . Any1x2 = (2) Mark the first ONE only (®) Copyright reserved Copyright reserved

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y Downloaded from hlayiso.com Life Sciences 2.2 221 2.2.2 2.23 224 2.25 23 2.3.1 2.3.2 2.3.3 2.3.4 Copyright reserved ra Grade 11 — Marking Guideline June 2017 Common Test ArthropodaY (4) Triploblastic’ (1) Exoskeleton” (4) itis impermeable, gas exchange cafi no longer occur throughout the body surface.” It has specialised gas exchange openings.“ lt cannot stretch to accommodate growth of the body.” This is avoided by moulting at regular intervals.” (4) The body wail of the animals are separated from the gut wail /there is increased distance between: the gut and other parts of the body making diffusion inadequate for transport of food, gases and excretory wastes. V Q 9) Mosquitoes¥ /Anopheles mosquitoes (1) pene ee tune Headachev’ Fever” Sweating’ Chills~ Muscular Pains Abdominal Pains” DiarrhoeaY” Nausea and Vomiting” Loss of Appetite” Cough” Mark first TWO only Any (2) High rainfall” Inadequate medical facilities” No money to buy insecticides” Lack of awareness” Mark first TWO only Any (2) Business people may not have acquired immunity/antibodies“”” to fight the infection. Increased chances of exposure to diseases” Any (1) Life Sciences 2.3.5 2.3.6 QUESTION 3 34 3.1.1 3.4.2 3.13 3.44 3.15 316 3.1.8 Copyright reserved 8 Grade 11 — Marking Guideline June 2017 Common Test Person gets a mild form of a disease through natural infection” The body produces antibodies to fight the diseasev’, get better The antibodies remain” in the body To fight off any further infection of the same diseasev Any (3) - Isa person who is a carrier for a disease” - but experience-no symptoms.” (2) (11) 140] Green algaew” . a) Mesozoic” (1) Bryophytes are land piants“/Charophyceans are aquatic (1) Accept in the range 250-260”: myav/million years ago {2) v Gymnosperms Angiosperms - Bear naked seeds¥ - Bear seeds that are enclosed in a fruit” -__Bear cones¥” =__Bear flowers” - Seeds dispersed by - Seeds are dispersed by wind only” various agents” - Pollination occurs by - Pollination by various wind only” agents” Any2x2+1Table (5) Angiosperms” (1) - They share a more recent” common ancestor” OR - Both” bear seeds” @) - Offspring produced are genetically different from each other and their parents” - If conditions in the habitat change drastically, some of the individuals will survive. - The zygote/seeds covered with thick protective coat” - which allow it to survive unfavourable conditions. - Large store of food in seeds” - allows seeds to remain dormant until conditions are suitable” 2x2 (4) (17)

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Downloaded from hlayiso.com Life Sciences SECTION C QUESTION 4 Dark phase using energy from ATP” Kreb’s cycle In the presence of oxygen” Adaptations of the mitochondria for cellular respiration 1 Grade 11 — Marking Guideline It occurs in the stroma of the chloroplast¥ - Carbon dioxide from the atmosphereY combines with energised hydrogen atoms” from the light phase to form carbohydrates” such as glucose and starch. The reactions are controlled by enzymes” It occurs in the mitochondrion” Pyruvic acidY produced during glycolysis is used in a cyclic series of reactions” Energised- hydrogen atoms are released” Which combine with co-enzymes” and COz is releasedvinto the atmosphere June 2017 Common Test Any 5 Any6 - Outer membrane is smooth~/mitochondria are rod-shaped ~ allowing for easy movement” of the mitochondria . - Outer membrane is permeableY - to allow for diffusion of oxygen» /pyruvic acid - Inner membrane is highly folded to form cristae” - to increase the surface area for attachment of enzymesY” - Mitochondria contain DNAY /ribosomes ~ for the manufacture of enzymes” ASSESSING THE PRESENTATION OF ESSAY Any3x2=6 Content: (17) Synthesis: (3) [20] All information provided is relevant to the question Ideas arranged in a logical sequence “Answered all aspects required by thé essay All information provided is relevant to the: - Dark phase = Kreb's cycle - Adaptations of mitochondria There is no irrelevant information All the information regarding - Dark phase - Kreb’s cycle - Adaptations of mitochondria Are arranged in a logical sequence. Atleast the following marks should be obtained for each of the following: - Dark phase (3/5) ~Kreb’s cycle (4/6) - Adaptations of mitochondria (4/6) Copyright reserved TOTAL SECTION C: 20 GRAND TOTAL: 150