Name .............................................................Sch ool .......................................………………… Roll Number........................…………………. Puntland State of Somalia Ministry of Education Puntand National Examination Board Form IV Biology Examination July 2006 2½ hours PLUS 10 MINUTES before the exam for reading through the paper TOTAL TIME 2 hours 40 minutes INSTRUCTIONS TO CANDIDATES This paper consists of 19 PRINTED pages. Count them now. Inform the invigilator if there are any missing. This paper consists of two parts: Section A: 10 marks Section B: 90 marks TOTAL 100 marks Answer ALL questions.
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BIOLOGY 2006 PNEB (PUNTLAND NATIONAL EXAMINATION BOARD)
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Name .............................................................School .......................................…………………
Roll Number........................………………….
Puntland State of SomaliaMinistry of Education
Puntand National Examination Board
Form IV Biology ExaminationJuly 2006
2½ hours
PLUS 10 MINUTES before the exam for reading through the paper
TOTAL TIME 2 hours 40 minutes
INSTRUCTIONS TO CANDIDATES
This paper consists of 19 PRINTED pages.Count them now. Inform the invigilator if there are any missing.
This paper consists of two parts:Section A: 10 marksSection B: 90 marks TOTAL 100 marks
Answer ALL questions. All answers must be written on this paper in the spaces provided
immediately after each question. ONLY WRITE ON THIS EXAM PAPER. ALL WORKING SHOULD BE CLEARLY SHOWN IN THE SPACE AFTER THE
QUESTION. Rough work can be done on page 2. This will not be marked NO extra paper is allowed. NO CALCULATORS are allowed. If you make a mistake cross out the incorrect answer clearly and write your
correct answer.
Puntland National Examination Board Secondary School Form Four ExaminationPuntland Certificate of Education Biology Examination July 2006
USE THIS PAPER FOR ROUGH WORK, IT WILL NOT BE MARKED.
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Puntland National Examination Board Secondary School Form Four ExaminationPuntland Certificate of Education Biology Examination July 2006
Sections:- A BQuestion Number:-
1 2 3 4 5 6 7 8
Possible Marks:-
10 12 10 15 12 10 20 11
Actual marks:-
Section A Multiple Choice Questions (10 marks)
Instructions: For each question in this section, circle the correct answer. If you change your mind, cross out the answer you have wrongly chosen and clearly circle the correct answer.
If the examiner thinks you have marked two answers you will not receive a mark for that question.
For each question there is only one correct answer. Each question is worth one mark.
1. All of the following diseases are caused by bacteria, except
A AIDS B tuberculosis (TB)
C syphilis D gonorrhoea?
2. A gene can be defined as:
A a small circular piece of DNA found in bacteria.
B an enzyme that joins DNA sections.
C the bonding of DNA fragments from a donor cell to the plastids.
D a section of DNA coding for a specific protein.
3. Which of the following are NOT true cells
A eukaryotic cells B bacteria
C viruses D prokaryotic cells?
4. Where are pollen grains produced
A stigma B carpel
C ovary D anther?
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Puntland National Examination Board Secondary School Form Four ExaminationPuntland Certificate of Education Biology Examination July 2006
5. If a diploid tomato cell with 24 chromosomes undergoes meiosis, how many chromosomes
will each of the gametes have produced.
A 6 B 12
C 24 D 48?
6. Implantation of blastocyst normally takes place in the:
A Epithelium of the uterus B Ovary
C Fallopian tube D Uterine wall
7. Transpiration from the leaves of a plant is greatest on days that are
A cold and still B cold and windy
C warm and windy D warm and still
8. The elbow joint is an example of a
A ball and socket joint B peg and socket joint
C hinge joint D sliding joint
9. Which of the following animals belongs to the phylum annelida?
A Centipede B Roundworm
C Flatworm D Earthworm
10. A flower appears in two forms, red and white. The allele for red is dominant.
If two heterozygous red flowers are crossed and the resulting seeds are grown the
flowers will be:
A all red B about 75% red and 25% white
C about 50% red and 50% white D all white
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Puntland National Examination Board Secondary School Form Four ExaminationPuntland Certificate of Education Biology Examination July 2006
Section B
Structured Questions
Instruction: Answer all the questions below as fully as possible. You must write all the answers in the spaces provided on the paper. The marks awarded for each section are shown.
Question 2
Enzymes control metabolic reactions in the body and the rate (speed) at which they occur.
(a) What name is given to metabolic reactions that synthesise (make) new molecules?
(d) Aerobic respiration can be summed up by the following biochemical equation:-
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Puntland National Examination Board Secondary School Form Four ExaminationPuntland Certificate of Education Biology Examination July 2006
C6H12O6 + 6O2 → 6CO2 + 6H2O + 2880 kJ
[i] Which part of the equation shows energy release and what units is it measured in?
......…………………………………………………………………………………………….…(2)
[ii] Does the process take place in a single step or many steps (multi-step)?
......…………………………………………………………………………………..…………..(1)
(e) ATP is found as an energy carrier in all cells and releases energy by the following equation:-.
ATP → ADP + P + Energy
[i] What are the names of the molecules ATP and ADP ?
......…………………………………………………………………………………..…………..(1)
......…………………………………………………………………………………..…………..(1)
[ii] Does the process take place in a single step or multi-steps (many steps)?
......…………………………………………………………………………………..…………..(1)
(f) The energy released is used to transmit nervous impulses. Name 2 other uses of the
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Puntland National Examination Board Secondary School Form Four ExaminationPuntland Certificate of Education Biology Examination July 2006
released energy.
......…………………………………………………………………………………..…………..(1)
......…………………………………………………………………………………..…………..(1)
Total 20 marksQuestion 8
The following question is about photosynthesis.
(a) Photosynthesis takes place in 2 stages, the light dependent stage and the light independent stage. In which part of the chloroplasts does each take place?