Name of the Organization : Limpopo Department Of Education
Exam : National Senior Certificate Grade 12 Exam Life sciences
Type : Sample Question Paper
Head Office : Limpopo
Grade/Subject : Life sciences
Year : 2014
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Website : http://www.edu.limpopo.gov.za/index.php??option=com_content&view=article&id=112&option=com_content
Download Question Paper :
Paper 1 (English) : https://www.southafricain.com/uploads/3352-LifeSciEng1.pdf
Paper 1 (Afrikaans) : https://www.southafricain.com/uploads/3352-LifeSciAfr1.pdf
Paper 2 (English) : https://www.southafricain.com/uploads/3352-LifeSciEng2.pdf
Paper 2 (Afrikaans) : https://www.southafricain.com/uploads/3352-LifeSciAfr2.pdf
Limpopo Grade 12 Exam Life sciences Sample Paper
Time: 2½ Hours
Instructions & Information
Read the following instructions carefully before answering the questions.
1. Answer ALL the questions.
Related :Limpopo Department Of Education NSC Grade 12 Mechanical Technology Sample Question Paper : www.southafricain.com/3347.html
2. Write ALL the answers in the ANSWER BOOK.
3. Start the answers to EACH question at the top of a NEW page.
4. Number the answers correctly according to the numbering system used in this question paper.
5. Present your answers according to the instructions of each question.
1.1 Various options are given 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 the ANSWER BOOK, for example 1.1.11 D.
1.1.1 A gradual change in the structure of organisms over time is known as …
B a mutation.
C protein synthesis.
D natural selection.
1.1.2 The following are statements relating to evolution:
(i) Artificial selection and metamorphosis show how evolution in organisms may have occurred.
(ii) There are similarities among various organisms.
(iii)Use or disuse of an organ results in it being modified.
(iv) All life forms develop from simple forms.
Which combination of statements relates to ideas on evolution proposed by Erasmus Darwin?
A (i), (ii), (iii) and (iv)
B (ii), (iii) and (iv)
C (i), (ii) and (iv)
D (i), (iii) and (iv)
1.1.3 Which ONE of the following is the result of artificial selection?
A DDT resistance in mosquitoes
B Decreasing effect of antibiotics on bacteria
C Increased milk yield in dairy cattle
D Peppered moths not being detected by predators
1.1.6 In humans the allele for blood group A is dominant to the allele for blood group O. Two parents both have blood group A. Their child has blood group O. What is the best explanation of this pattern of inheritance?
A The child has inherited the blood group directly from a grandparent.
B The parents are homozygous for the blood group alleles.
C The parents are heterozygous for the blood group alleles.
D There has been a mutation in the blood group alleles.
1.1.7 In an investigation it was found that 10% of the bases in a molecule of DNA were thymine. What was the ratio of thymine to guanine in the same molecule?
A 1 : 2
B 1 : 3
C 1 : 1
D 1 : 4
1.1.8 After observing a certain phenomenon a scientist can formulate a/an …
1.1.9 Genes in organisms can be manipulated by human beings in order to produce useful substances. One example of a useful substance produced in this way is the human protein insulin, which is used to treat diabetes.
Which ONE of the following accurately describes how human insulin can be produced and used to treat diabetes?
A Take insulin from bacteria and place it in a human being, thus enabling the human being to produce insulin.
B Take insulin genes from bacteria and place them in a human being, thus enabling the human being to produce insulin.
C Take insulin genes from a human being and place them in bacteria. Use the insulin produced by the bacteria to treat diabetes.
D Take insulin from a human being and grow it in bacteria. Use the insulin produced by the bacteria to treat diabetes.