Life Sciences Grade 12 KZN March 2015 Paper & Memo

Basic Education KwaZulu-Natal Department of Basic Education REPUBLIC OF SOUTH AFRICA A LIFESCIENCES tsi‘ cy : oo : : : on 1 s 7 r " oS _ COMMONTEST ot | * = MARCH2015 GE () “edednbhaedeeeabeedeewnadesdendeeieeeennenenee? NATIONAL SENIOR CERTIFICATE 5) MARKS: 60 | TIME: 1 hour This question paper consists of 9 pages. Copyright reserved Please turn over ET ETE

Life Sciences Downloaded from hlayiso.com 2 Common Test March 2015 _NSC 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 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. 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 must use a non-programmable calculator, protractor and. a compass where necessary. Write neatly and legibly. Copyright reserved Please turn over

CO) Life Sciences SECTIONA QUESTION 1 Downloaded from hlayiso.com 3 NSC Various possible options are provided as answers to the following questions. Choose the correct answer and write only the letter (A - D) next to the question number (1.1.1 - 1.1.5) in the answer book, for e.g. 1.1.6 D. 1.4 1.2 1.3 Copyright reserved The process of gametogenesis in human males and females is different in that ... A_ meiosis does not take place in males. B_ sperm cells are formed by mitosis while ova are formed by meiosis. Call the cells formed in males become sperm cells but only one cell becomes the ovum in females. D_ sperm cells are haploid whereas the ovum is diploid. Study the steps below representing a process in males. i, Immature sperm are stored in the epididymis ii. | Spermatogenesis occurs iii. As sperm move along the sperm duct, fluids are added from glands iv. Semen passes along the urethra out of the body Which ONE of the following combinations represents the correct steps in the production of semen in males? A i, ii, ili, iv Bi, iii, i, iv Ci, i, iii, iv D_ iii, ii, iv, i Which ONE of the following statements about the hormones FSH and LH is correct? A As the level of FSH increases, the level of LH decreases B_ FSH inhibits LH C FSH is produced by the pituitary gland and LH is produced by the corpus luteum D Both hormones reach a maximum level around the time of ovulation Please turn over Common Test March 2015

Downloaded from hlayiso.com Life Sciences Common Test March 2015 NSC 1.4 The graph below shows the differences in the chances of conception per month in women between the ages of 22 years and 48 years. 30: 25. 207 15 Chance of conception per month (%) Age in years -{/roa-online.com/ivffindex. php? Female-Infertility-34 What is the difference in the chance of conception per month between a woman that is 43 years old and one that is 36 years old? A 20 % B 10 % Cc 5% D 15% Copyright reserved Please turn over

Life Sciences 1.5 Copyright reserved Downloaded from hlayiso.com 5 Common Test March 2015 NSC Study the graph below that shows the density of mucus in the cervix during the uterine cycle. Thickness of mucus (arbitrary units) o - 8 G&G FB & Density of mucus in the cervix during the uterine cycle ovulation, — 10 18 36 35 36 Time (days) ot A reasonable conclusion that can be made from the information in the graph above is that ... A B Cc D the mucus in the cervix is thinnest around the time of ovulation. the thickness of the mucus does not change during the uterine cycle. the thickness of the mucus is controlled by hormones. mucus in the cervix promotes implantation. TOTAL QUESTION 1: 10 TOTAL SECTION A: 10 Please turn over

Downloaded from hlayiso.com Life Sciences Common Test March 2015 NSC SECTION B QUESTION 2 2.1 The diagram below represents a cell undergoing meiosis. The graph shows the DNA content of three samples of cells. DNA content (ny a Now oo» = | | Sample http://www.easynotecards.com/notecard set/7760 2.1.1 Identify the structures labelled A and B. (2) 2.1.2 Name the phase of meiosis shown in the diagram. (1) 2.1.3. Give ONE observable reason for your answer to QUESTION 2.1.2. (1) 2.1.4 How many chromosomes will be present in the cell at the: (a) Beginning of prophase | (1) (b) End of meiosis II (1) 2.1.5 State whether the cell undergoing meiosis was taken from sample I, Hor fon the graph. (1) 2.1.6 Give an explanation for your answer to QUESTION 2.1.5. (2) (9) Copyright reserved Please turn over

Life Sciences Downloaded from hlayiso.com 7 NSC Common Test March 2015 2.2 The diagrams below represent chicks that are three hours old. Copyright reserved 2.2.1 2.2.2 2.2.3 2.2.4 Chick A Chick B Both sets of parents of the chicks in the above diagram lay eggs. Give the correct term for this type of reproductive strategy. (1) Which chick (A or B) represents precocial development? (1) State TWO ways in which the chick identified in QUESTION 2.2.2 will be different from the chick that has altricial development. (2) “Precocial development requires fertilization to be internal.” List TWO advantages of internal fertilization for organisms living on land. (2) (6) TOTAL QUESTION 2 (18) Please turn over

‘ Life Sciences ‘QUESTION 3 Sopyright reserved Downloaded from hlayiso.com Common Test March 2015 NSC The diagram below represents a part of the reproductive process in humans. Which LETTER on the above diagram represents the process of: (a) Fertilization (b) Implantation Give the correct term for the cell labelled A. Describe the changes that occur in ceil A until it forms a blastula / blastocyst. Name the structure that will form at D after the release of structure labelled C. Give ONE function of the structure named in QUESTION 3.1.4. (1) (1) (1) (4) (1) (1) (9) Please turn over

Downloaded from hlayiso.com 9 Life Sciences Common Test March 2015 | | NSC 3.2 Study the graph below. Ovulation . 5 ; H pS} H : ~ a © s ; : 2 i ; Dm | a ‘ oc a ca 65 ‘ ; o> ‘ a g § : aX ES : 28 i Y t 14 28 4 i 3.2.1 Identify hormones X and Y. (2) | 3.2.2 Explain the changes in level of hormone Y between day 14 and day 28. (4) | (6) | TOTAL QUESTION 2: (15) | SECTION C | QUESTION 4 C) A gene consists of DNA which codes for a particular protein. When a gene mutation ~ occurs, it changes the base sequence on the DNA molecule, affecting protein synthesis. Describe the process of protein synthesis and explain how this process may be affected by a gene mutation. NOTE: NO marks will be awarded for answers in the form of flow charts or diagrams. Content: (17) Synthesis: (3) TOTAL QUESTION 4: (20) TOTAL SECTION C: (20)| GRAND TOTAL: 60 Copyright reserved

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