© ICG 1 NSC Grade 11
LIFHIG211
GRADE 11 MID-YEAR EXAMINATION
LIFE SCIENCES (NSC11-10)
D10055614-5 TIME: 09H00 – 11H30 TOTAL: 150 MARKS
DURATION: 2½ HOURS DATE: 14 JUNE 2013
This question paper consists of 15 pages.
NATIONAL SENIOR CERTIFICATE (NSC)
Life Sciences
© ICG 2 NSC Grade 11
INSTRUCTIONS AND INFORMATION Read the following instructions carefully before answering the questions: 1. Write your answers in your answer book, which is provided in the exam. 2. Answer ALL the questions. 3. Read the instructions carefully for each question and answer only what is required. 4. Begin with the question for which you think you'll get the best marks. 5. Number the answers correctly according to the numbering system used in this question
paper. 6. Except where other instructions are given, answers must be in full sentences. 7. The mark allocation of each question will determine the length of your answer. Give
enough facts to earn the marks allocated. Don't waste time by giving more information than required.
8. Please write neatly − we cannot mark illegible handwriting. 9. Start the answer for each question on a NEW page, for example Question 1 – new
page, Question 2 – new page. 10. If answers are not presented according to the instructions of each question, candidates
will lose marks. 11. Only draw diagrams or flow charts when requested to do so. 12. The diagrams in this question paper are not necessarily drawn to scale. 13. The use of graph paper IS NOT permitted. 14. Non-programmable calculators and appropriate mathematical instruments may be
used. 15. Any student caught cheating will have his or her question paper and notes confiscated.
The College will take disciplinary measures to protect the integrity of these examinations.
16. If there is something wrong with or missing from your question paper or your answer book, please inform your invigilator immediately. If you do not inform your invigilator about a problem, the College will not be able to rectify it afterwards, and your marks cannot be adjusted to allow for the problem.
17. This question paper may be removed from the examination hall after the examination has taken place.
This question paper consists of THREE sections: Section A, Section B and Section C.
Question Section Marks
1 A: ONE question Answer the question
50
2 B: TWO questions Answer BOTH questions
80 3
4 C: ONE question Answer the question
20
TOTAL MARKS: 150
Life Sciences
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SECTION A (50 MARKS) _________________________________________________________________________
ANSWER THE QUESTION _________________________________________________________________________ QUESTION 1 1.1 Different possible answers are suggested for the following
questions. Indicate the correct answer by writing the letter of your choice next to the appropriate question number.
1.1.1 Which of the following structures are found in prokaryotic
cells?
A. Ribosomes B. Mitochondria C. Nuclear membranes D. Cell membranes
1.1.2 The phylum of animals that has a rod of stiffening tissue
to support the body with a nerve cord running alongside it is . . .
A. Arthropoda B. Annelida C. Chordata D. Cnidaria
1.1.3 The specialised cells found in the body wall of the sponge
that filter out tiny particles of food are called . . .
A. nematocysts B. mesoglea C. collar cells D. endodermal cells
1.1.4 All Annelids have the following characteristics:
A. an exoskeleton B. hydrostatic skeleton C. radial symmetry D. are diploblastic
1.1.5 Asexual reproduction has the following advantage:
A. two parents are needed B. only one parent is needed C. only a few offspring are produced D. pollination is essential
Life Sciences
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1.1.6 Mosses have to live in damp conditions because they:
A. have a waterproof cuticle B. have xylem C. have roots D. need water for fertilization
1.1.7 Gametes are . . .
A. made in sporangia B. diploid C. haploid D. used in asexual reproduction
1.1.8 In which order do the following processes occur as food
passes along the alimentary canal?
A. Ingestion, grinding, digestion, absorption B. Grinding, ingestion, absorption, digestion C. Ingestion, digestion, grinding, absorption D. Ingestion, grinding, digestion, absorption
1.1.9 Which of the following kingdoms is made up of
prokaryotes?
A. Animal B. Fngi C. Monera D. Protista
1.1.10 The fern gametophyte generation . . .
A. is the dominant generation B. produces spores C. has sporangia D. produces gametes (10 × 2 = 20)
1.2 Give the correct biological word or term for each of the following
descriptions. Write only the word or term next to the relevant question number.
1.2.1 Spherical bacteria. 1.2.2 The gas used by algae to photosynthesise. 1.2.3 The immune cells in the human body that produce
antibodies. 1.2.4 The structure that develops from the spores of the fern
plant. 1.2.5 A plant body that is not differentiated into true roots,
stems and leaves.
Life Sciences
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1.2.6 Cells formed as a result of the fusion of two sex cells. 1.2.7 The process which involves the breakdown of organic
compounds to release energy. 1.2.8 The resistant structure formed by bacteria during
unfavourable conditions. 1.2.9 Chemical substances produced by bacteria and moulds
that are able to destroy pathogenic bacteria. 1.2.10 Plants that have naked seeds. (10 × 1 = 10) 1.3 Indicate whether each of the statements in Column A applies to A
only, B only, both A and B or none in Column B. Write only A or B only, both A and B or none next to the relevant question number.
Column A Column B
1.3.1 Lizard A. Reptilia
B. Mammalia
1.3.2 Crab A. Crustacea
B. Arthropoda
1.3.3 The vegetative part of a moss plant
A. Sporophyte
B. Gametophyte
1.3.4 A disease that spreads quickly through a community in a given period of time
A. Epidemic
B. Vectors
1.3.5 Retroviruses A. DNA
B. RNA
(5 × 2 = 10)
Life Sciences
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1.4 Examine the table below and answer by writing down the correct answers next to the question numbers on your answer sheet.
Symmetry Cephalisation
Tissue layers (name them)
Presence of coelom
Blood systems
Porifera 1.4.1 1.4.2 None 1.4.3 none
Platyhelminthes 1.4.4 Cephalisation sometimes present
1.4.5 1.4.6 1.4.7
Acoelomate 1.4.8
Annelids 1.4.9 Cephalisation present
Endoderm Mesoderm Ectoderm
1.4.10
(10 × 1 = 10) [50]
TOTAL SECTION A: 50
Life Sciences
© ICG 7 NSC Grade 11
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SECTION B (80 MARKS) _________________________________________________________________________
ANSWER BOTH QUESTIONS _________________________________________________________________________ QUESTION 2 2.1 Examine the diagrams below and answer the questions that follow:
Source: http://kerala.skool.in/id220.htm 2.1.1 Suggest an aim for this experiment. (2) 2.1.2 Provide a hypothesis for this experiment. (2) 2.1.3 What testing solution will cause starch to stain black? (1) 2.1.4 Describe the procedure used to remove chlorophyll
during this experiment. (4) 2.1.5 List THREE factors that affect the process of
photosynthesis. (3)
Life Sciences
© ICG 8 NSC Grade 11
2.2 Examine the photomicrographs below and answer the questions that follow:
A B Source: http://www.google.co.za/images 2.2.1 Identify both organelles A and B. (2) 2.2.2 Draw a fully labelled diagram of the organelle in
photomicrograph A. Do not redraw from the photomicrograph. (6)
2.2.3 What is the function of organelle B? (1) 2.2.4 Draw a table and list FOUR structural differences
between organelle A and B. (9) 2.2.5 Name: A. the gas given off by organelle A; and B. the gas required by organelle B. (2)
Life Sciences
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2.3 Examine the diagrams below and answer the questions that follow:
Source: http://www.tutorvista.com/content/biology/biology-ii 2.3.1 Why are the seeds in flask B boiled? Flask B is referred
to as the CONTROL – explain the term. (2) 2.3.2 What is the function of the thermometers? What results
would you expect at the end of the experiment? (2) 2.3.3 Why is wet cotton used in the experiment rather than an
impermeable waxy substance like prestik? (2) 2.3.4 Provide TWO reasons why the flasks in a retort stand
should be upside down before starting the experiment?. (2) [40]
Life Sciences
© ICG 10 NSC Grade 11
QUESTION 3 3.1 Examine the sketch below and answer the questions that follow:
Source: Study and Master Biology Grade 12
3.1.1 Provide labels for the parts numbered 1 – 4. (4) 3.1.2 When the food enters the stomach a series of events take
place, namely mechanical breakdown and chemical digestion. Describe:
A. mechanical breakdown in the stomach; and B. chemical digestion in the stomach (2 × 2 = 4) 3.1.3 Identify organ X. The organ marked X secretes both
enzymes and hormones. Differentiate between the two organic substances. (3)
3.2 Examine the sketch below and answer the questions that follow. 3.2.1 Identify this structure (1)
Source: Study and Master Biology Grade 12
3.2.2 Provide labels for the parts numbered 1 and 2. (2) 3.2.3 Name the food substances that enter 1 and 2. (2)
X
Life Sciences
© ICG 11 NSC Grade 11
3.3 Examine the diagrams below and answer the questions that follow:
5
6 D 7 Source: http://www.google.co.za/images 3.3.1 Identify the plant group represented by A and B. (2) 3.3.2 Identify the generation represented by B. (1) 3.3.3 Are the structures labelled 6 haploid or diploid? (1) 3.3.4 Identify the structure D. (1) 3.3.5 Provide labels for the parts numbered 1 – 7. (7) 3.3.6 Organisms in the plant B group have rhizoids – discuss
the function of these structures. (1) 3.3.7 Name the group of plants that enclose their seeds in an
ovary. (1) 3.3.8 What is the main function of flowers? (1) 3.3.9 To which group of plants does C belong? (1)
1
2
3
rhizoids
A
B
4
Life Sciences
© ICG 12 NSC Grade 11
3.4 3.4.1 Define the term 'cephalisation'. (4) 3.4.2 Write a short paragraph on cephalisation in Chordates. (4) [40]
TOTAL SECTION B: 80
Life Sciences
© ICG 13 NSC Grade 11
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SECTION C (20 MARKS) _________________________________________________________________________
ANSWER THE QUESTION _________________________________________________________________________ QUESTION 4 4.1 Read the passage below and answer the questions that follow:
Malaria is endemic (always present) in Africa and Asia. Each year 200 million to 300 million people are infected with malaria, mostly in the hot tropical and sub-tropical regions, and each year more than one million people die from it. The malarial parasite is a unicellular spore-forming organism called Plasmodium. Plasmodium in humans produces spores called merozoites which infect and re-infect red blood corpuscles causing them to burst. This results in the fever characteristic of malaria patients. The female mosquito, Anopheles, spreads a common type of malaria caused by Plasmodium vivax. Plasmodium is introduced in the human when a mosquito sucks up blood. Scientists are busy researching ways to control the mosquito population by producing sterile male mosquitoes using genetic engineering. They will have to convince pharmaceutical companies to continue to invest money in this research so as to ensure that malaria can be effectively controlled.
Source: Grade 11 Exemplar 2011
Life Sciences
© ICG 14 NSC Grade 11
The graph below shows the temperature chart of a person suffering from malaria.The first fever attack usually takes place 10 days after infection. Such an attack is characterised by three stages: cold, hot and sweating stages. Assume that day 1 on the chart was 22nd March 2006.
Source: WCED Nov 2011 Question 2.1 4.1.1 From the chart determine: A. The normal temperature of a healthy person. (1) B. The number of fever attacks recorded. (1) 4.1.2 Calculate the following: A. The date on which the patient was initially infected
by the mosquito. (1) B. The day you would expect the start of the next fever
attack. (1) 4.1.3 Determine from the chart the patient’s: A. lowest temperature on Day 2. (1) B. highest temperature on Day 2. (1)
Life Sciences
© ICG 15 NSC Grade 11
4.1.4 Refer to Day 5 to answer the following: A. Suggest a reason for the sharp increase in
temperature during the hot stage. (1) B. Suggest ONE symptom that the patient might
experience during the cold stage. (1) 4.1.5 State TWO ways in which malaria can be managed. (2) 4.1.6 Do you feel that pharmaceutical companies should fund
the scientists' research? Discuss your answer. (2) 4.2 Write a paragraph on the functioning of the human immune
system with reference to: A. Specific immunity (4) B. Passive immunity (2) Synthesis (2) [20]
TOTAL SECTION C: 20
GRAND TOTAL: 150 MARKS
