Life Sciences Grade 11 April Test 2021 Paper & Memo

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Downloaded from hlayiso.com Life sciences NSC April 2021 Common Test INSTRUCTIONS AND INFORMATION Read the following instructions carefully before answering the questions. de 2. 10. alaie Answer ALL the questions. Write ALL the answers in the 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. Do ALL drawings in pencil and label them in blue or black ink. Draw diagrams, tables or flow charts 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. Write neatly and legibly. Copyright reserved Please turn over

Downloaded from hlayiso.com 3 Life sciences NSC April 2021 Common Test 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 1.1.3) in the ANSWER BOOK, for example 1.1.4 D. 1.1.1 The cell walls of most fungi are mainly composed of: A _ chitin B cellulose C protein D lignin 1.1.2 | The diagram below represents the flower. nel ppp Which of the following combinations below represent the male sexual organs of a flower? A AandC B DandE C BandD D AandE Copyright reserved Please turn over

Downloaded from hlayiso.com a Life sciences NSC April 2021 Common Test 1.1.3 Which ONE of the following phyla is asymmetrical? A Porifera B_Platyhelminthes C Cnidaria D- Chordata (3 x 2) 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 1.2.4) in the ANSWER BOOK. 121 The gut that runs through an organism with two openings 22 The tree that shows evolutionary relationships among different species 1.2.3 A group of plants that have seeds enclosed in an ovary 1.2.4 The concentration of sense organs at the anterior end of an animal leading to the formation of a head (4x1) 1.3 Indicate whether each of the descriptions 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 1.3.5) in the ANSWER BOOK. COLUMN | COLUMN II 1.3.1. The plant group that is a thallus | A: Bryophytes plants B: Pteridophytes 1.3.2. The phylum characterised by A: Chordata diploblastic B: Arthropoida Copyright reserved (2 x 2) Please turn over (6) (4) (4)

Downloaded from hlayiso.com 5 Life sciences NSC April 2021 Common Test 1.4 Study the diagram below showing the arrangement of body tissues. 144 1.4.2 1.4.3 14.4 Copyright reserved \dentify the type of symmetry shown in the diagram above. Explain ONE advantage of the symmetry mention in QUESTION (eet Identify the type of skeleton of the organism shown in the diagram above. State TWO disadvantages of the type of skeleton mentioned in QUESTION 1.4.3. Please turn over (1) (2) (2) (6)

Downloaded from hlayiso.com Life sciences NSC April 2021 Common Test SECTION B QUESTION 2 2.1 The diagram below shows the branch of the pine tree. 2.1.1 To which plant group does the pine tree belong? 2.1.2 Identify ONE visible reason for your answer in QUESTION 2.1.1. 2.1.3 Explain TWO significance of the shape of the leaves in the diagram above. 2.1.4 State TWO disadvantages of wind pollination. Copyright reserved Please turn over (1) (1) (4) (2) (8)

Downloaded from hlayiso.com 7 Life sciences NSC. April 2021 Common Test 2.2 Coronavirus, the world’s greatest enemy. 22) State TWO recommendation to prevent the spread of coronavirus. 2 Give ONE reason why it is difficult to develop a cure for viral diseases. 2.2.3 Coronavirus is also known to supress the immune system. Explain the effect of this to people with underlying conditions/ diseases. 2.2.4 State ONE significance of vaccines in the human body. 2.3 Explain THREE reasons why gymnosperms and angiosperms are better suited to live on land than in water. Copyright reserved Please turn over (2) (1) (6) (6) [20]

Downloaded from hlayiso.com fe} Life sciences NSC April 2021 Common Test QUESTION 3 3.1 Scientists conducted an investigation to determine the effect of antibiotic on bacteria causing pneumonia in children from 2000 to 2006. The procedure for the investigation: e The bacteria were cultured in the same type of agar medium in petri dishes of the same size. bacterial growth was examined. e The investigation was repeated a number of years. Petri dishes were divided into two groups. Petri dish A was treated with an antibiotic. Petri dish B was not treated with antibiotic. An antibiotic was introduced in year 2000 in petri dish A. Both petri dishes were then incubated under the same conditions and The table below shows the results of the investigation. GROWTH OF BACTERIA PER 100 000 YEARS PETRI DISH A _| PETRI DISH B 1999 85 23 2000 60 28 2001 20 30 2002 9 40 2003 5 45 2004 2 50 2005 0.2 55 2006 0 60 3.1.1 Identify the independent variable of the investigation. 3.1.2. What was the growth of bacteria in petri dish A in 2004? 3.1.3 Describe the growth of pneumonia causing bacteria from 2001 to 2006 in petri dish A. 3.1.4. State TWO factors that were kept constant during the investigation. 3.1.5. State what was done by the scientists to improve the reliability of the investigation. 3.1.6 Explain why petri dish B was included in the investigation. Copyright reserved Please turn over (1) (2) (2) (1) (2) (10)

Downloaded from hlayiso.com 9 Life sciences NSC April 2021 Common Test 3.2 Study the diagram below showing the arrangement of body tissues. Diagram A x Gut cavity Mesoglea Diagram B Y Gut cavity 3.2.1. Which organism (diagram A or B) appeared first? 3.2.2 Name THREE animal groups represented by diagram A. 3.2.3. Name the phylum that evolved after cnidarians. 3.2.4 Identify layer: (a) X (b) Y 3.2.5 Describe ONE advantage of structure X. 3.2.6 Which organism (diagram A or B) is radially symmetrical? TOTAL SECTION B: GRAND TOTAL: Copyright reserved (1) (1) (2) (1) (10) [20] 40 60

~~ ~Downloaded from hlayiso.com LFSC GRY + 70 2 Life sciences-Grade 11 NS¢-memorandum April 2021 ECTI KWAZULU-NATAL PROVINCE eae EDUCATION QUESTION 1 REPUBLIC OF SOUTH AFRICA 1.4 144° Avy’ 412 AVY 113 Cvv (3x 2) (6) 1.2 1.2.1 Through gutv NATIONAL 4.2.2 Phylogenetic treev 1.2.3. Angiospermsv SENIOR CERTIFICATE 1.2.4 Cephalisation’” (4x1) (4) 43 13.4 Aon GRADE 11 13.2 Nonev’ (2x2) (4) oombeearscacarsassrccs Saeeansssensans . 14 144 Bilaterale” oy +] LIFE SCIENCES . " . 1.4.2 - Allows for cephalisation” : MEMORANDUM " - making detection of prey and danger much easier-” (2) 7 " 1.4.3 Exoskeleton ¥ qt) H PROVINCIAL PAPER : ued 4 1. 1.4.4 - Itrestrict animal growthy ». APRIL 2021 i. - Skeleton needs to be regularly shed/moulting must occur and . ha animals become vulnerable to predators” 2) Seuseezagsses Sesssereesrersensensesesesesae sees? (6) TOTAL SECTION A: 20 SECTION B MARKS: 60 QUESTION 2 TIME: 1 hour ] 21 2.1.4 GymnospermsY (1) 2.1.2 Presence of cones” (ly Mark first ONE only This memorandum consists of 4 pages. 2.1.3 - Leaves are needle shaped v i - reducing surface area exposed to the sun” - Leaves have a thick cuticlev - to reduce water loss/transpiration” (4) Mark first TWO only Copyright reserved Please tum over

Life sciences-Grade 11 2.2 2.3 Downloaded from hlayiso.com 3 NSC-memorandum April 2024 2.1.4 - Water is not required for fertilisation” - It can only occur during windy conditions” - Pollen is transported to any directionfrandomlyY - Requires large amount of pollen to be producedvY’ - Cones/ovules must be sticky for pollen to sticky” - Chance of landing on cones/flowers of different species” Mark first TWO only 2.2.1 - Regular hand washingy - Covering mouth and nose when coughing and sneezing” - Maintain social distancingv Any Mark first TWO only 2.2.2 Viruses are non-livingy Mark first ONE only 2.2.3 - They have weakened immune system” - therefore, vulnerable to any form of infections - and their bodies are not able to fight them” 2.2.4 They stimulate the immune system to produce antibodiesv Mark first ONE only - Pollen grains are protected by resistant walis~” - to prevent desiccationy - Pollen grains have air sacs“ - for wind pollination v - Seeds are protected by a resistant coat/testa v - to prevent desiccationy ~- Leaves have a cuticle and sunken stomatar - to reduce water lossv’ - They have conducting tissue~ - to ensure efficient transport of water and minerals” Any (3 x 2) Mark first THREE only QUESTION 3 3.1 Copyright reserved 3.1.1 Time (years)~ 3.1.2 200 000Vv 3.1.3 As the years increases, the growth rate of bacteria decreasesv Vv 3.1.4 - Type of agar medium” - Size of petri dishes” - Conditions where petri dishes were incubatedY Any Mark first TWO only Piease tum over (8) (2)- (1) 2) (1) (8) (6) [20) (1) (2) (2) (2) Life sciences-Grade 11 Pe an 32 3.21 3.2.2 3.2.3 3.24 3.2.6 4 NSC-memorandum April 2021 Repeated the investigation’ - To serve as controlv” - So that it can be compared with group AY - and show that antibiotic is the only factor that affects the resultsv/ improves validity of the investigation Any By Annelids” , molluscs” , arthropods”, chordatesv” Any Mark first THREE only Poriferav (a) coelomy (b) ectoderm” - Provides room for organ development” - allowing for more complex organisms” - provides a hydrostatic skeleton” - to provide support” - Separates gut wall from the body” - Allowing more efficient digestion of foodv - Increases respiration and nutrition’ - by allowing nutrients to dissolvew Any Mark first TWO only BY TOTAL SECTION B: GRAND TOTAL: Copyright reserved (1) (2) (10) (1) (3) (1) a) (1) 2) (1) (10) [20] 60