Life Sciences Grade 12 KZN March 2018 Paper & Memo

Education KwaZulu-Natal Department of Education REPUBLIC OF SOUTH AFRICA LIFE SCIENCES H * COMMON TEST * : MARCH 2018 | 1 | NATIONAL SENIOR CERTIFICATE GRADE 12 | MARKS: 60 TIME: 1 hour ‘| N.B. This question paper consists of 7 pages including this page. | Copyright reserved Please turn over i LLL LE LA DLE LLL TATE TTA LAAT OT

Downloaded from hlayiso.com Life Sciences - Grade 12 2 March Common Test NSC INSTRUCTIONS AND INFORMATION Read the following instructions carefully before answering the questions. 1. 2s 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, 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 must use a non-programmable calculator, protractor and a compass, where necessary. Write neatly and legibly. Copyright reserved Please turn over

Downloaded from hlayiso.com Life Sciences - Grade 12 3 March Common Test NSC SECTION A QUESTION 1 41 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 1.1.2) in your ANSWER BOOK, for example 1.1.3 D. 1.14.4 Which ONE of the following receives and stores waste products in an amniotic egg? A Amnion B Yolk sac C Chorion D_ Allantois TeA12 At the end of meiosis I, a cell with 20 chromosomes originally will produce two cells each with ... A 5 chromosomes. B20 pairs of chromosomes. Cc 10 chromosomes. D 10 pairs of chromosomes. (2 x 2) (4) 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 1.2.2) in the ANSWER BOOK 1.241 A type of development where the young is incapable of movement and is weak and helpless at birth 122.2 A type of reproduction where the young is nourished through the placenta of the mother (2 x 1) (2) 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 1.3.2) in the ANSWER BOOK. COLUMN | COLUMN II 1.3.1 Forms spindle threads in animal | A: — Centriole cells B: | Centromere 1.3.2 Peptide bonds form between A: — Translation amino acids B: _ Transcription Copyright reserved (2 x 2) (4) TOTAL SECTION A: 10 Please turn over

Downloaded from hlayiso.com Life Sciences - Grade 12 4 March Common Test NSC. SECTION B QUESTION 2 2.1 The diagram below represents the life cycle of an organism. The number of chromosomes in the cells at different stages is shown. MALE FEMALE als TX GAMETES | 24 21 21 22 20 22 20 43 |S PARENTS Explain what led to a difference in the chromosome number between offspring S and the parents. 2.2 Describe how the events and the result of protein synthesis will be influenced if one of the nitrogenous bases on DNA is changed. 2.3 Read the following extract relating to a criminal investigation. Inspector Memela was investigating the scene of a violent crime. The victim was a 25 year old woman. She had been raped, stabbed and left to die. They found a view pieces of hair in one of her hands. There was also skin tissue under her nails. They arrested three possible suspects. DNA profiles of the 3 suspects and the victim were compared with the profile developed using DNA from the crime scene. 2.3.1 Mention TWO sources of DNA that were collected from the crime scene 2.3.2 State TWO possible objections to the use of DNA profiles as evidence in a criminal investigation. Copyright reserved (5) (6) (2) (2) (4) [15] Please turn over

Downloaded from hlayiso.com Life Sciences - Grade 1 March Common Test NSC QUESTION 3 341 The diagram below shows a portion of a DNA molecule 3.1.4 Identify: (a) Part1 (1) (b) Part 2 (1) 3.1.2 Give THREE visible reasons for identifying this molecule as DNA. (3) 3.1.3 State TWO places in a cell where DNA is found. (2) Copyright reserved Please turn over

Downloaded from hlayiso.com Life Sciences - Grade 12 6 March Common Test NSC 3.2 The concentration of hormones of 30 women aged between 20 and 30 was monitored over 28 days during an investigation. The procedure was as follows: - All women were put on the same type of diet. - The instrument used to measure the concentration of hormones was the same in all women. - The measurements were taken by the same person. - Measurements were taken at the same time of the day. The table below shows the results of the investigation. Average Hormone Concentration Days (arbitrary units) Progesterone Oestrogen 0 ie) 5 5 0 5 10 0 5 15 3 15 20 6 10 25 12 4A 28 9 7 3.2.1 What evidence from the table indicates that ovulation occurred around day 15? (2) 8.2.2 Account for the decrease in progesterone concentration between day 25 and 28. (2) 3.2.3 Why did the investigator use 30 women in this investigation rather than 5? (1) 3.2.4 State THREE factors that were kept constant during this investigation. (3) (8) [15] TOTAL SECTION B: 30 Copyright reserved Please turn over

Downloaded from hlayiso.com Life Sciences - Grade 12 7 March Common Test NSC SECTION C QUESTION 4 Describe the mechanisms during meiosis that result in genetic variation. Also describe the process of fertilisation and how the resulting foetus is protected during gestation. Content: Synthesis: (17) NOTE: NO marks will be awarded for answers in the form of flow charts, tables or diagrams. TOTAL SECTION C: 20 GRAND TOTAL: 60 Copyright reserved

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