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Biology
Practical
Paper 2
2 ½ HOURS
ACEITEKA JOINT MOCK EXAMINATIONS 2023
UGANDA CERTIFICATE OF EDUCATION
BIOLOGY PRACTICAL.
PAPER 2
TIME: 2HOURS
Instructions to Candidates;
Answer all the three questions in this paper
Use only the spaces provided for all your answers
Don’t use coloured pencils or crayons.
Use sharp pencil to draw
Be neat
Carefully follow orders in each question
No additional sheet of paper should be added to answer booklet.
For examiner’s use
question score examiner’s number or initials
Total
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© Aceiteka Joint Mock Examinations 2023
1. You are provided with 3 tea bags, 3 plastic beakers, thermometer, water, maize flour, and
reagents for food test.
PART A
You are required to investigate the effect of temperature on a physiological process using the
procedures below.
(a) Label three beakers of same size as A, B, and C.
-Pour 100 cm3 of distilled water at room temperature in beaker A,
-Pour 100 cm3 of distilled water at 45oC in beaker B.
-Pour 100 cm3 of distilled water at 90 oC in beaker C.
-Put a tea bag in each beaker and immediately start timing. (do not stir or shake)
-Determine and record in table 1 the temperature in each beaker at the start of timing
-Record observation on the rate of spread of colour-dye in each beaker by indicating whether the
rate is slow, fast, or moderate.
-Also record observations on intensity of colour of water after 20 minutes
- Record your results in table 1
Results
Room temperature …………………………………………………………………. ( ½ mark)
Table 1
(4 ½ marks)
Observation
Temperature at start of
Beaker timing
Rate of spread Colour intensity
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(b) (i) Name the process being investigated in (a) (01mark)
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(ii) Explain the observed effect of temperature on the process named in (a). (02marks)
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(iii) Suggest what the colour dye could be representing in your body. (01 mark)
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PART B
You are required to investigate another process that occurs in your mouth as you feed on maize
flour.
(a) Mix the maize flour provided with 10 cm3 of hot water and shake to mix. Boil gently for 1
minutes and label the mixture as solution X. Carry out the tests in table 2 below on solution X.
record your observations and deductions in table 2 below.
Table 2
Test Observation Conclusion
(i) To 1 cm3 of
solutionX, add 3 drops
of iodine
solution.1.5mks
(ii) To 1cm3 of solution
X, add 1cm3 of
benedict’s solution, and
boil for 1minute.2mks
(iii) To 1 cm3 of solution
X, add 1cm3 of sodium
hydroxide solution,
followed by 2 drops of
copper (ii)
sulphate.2mks
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© Aceiteka Joint Mock Examinations 2023
Test Observation Conclusion
(iv) Rinse your mouth
with clean water and
generate about 1cm3 of
saliva in clean test tube.
Add 1cm3of solution X
to the saliva and leave
for 20 minutes. Then
add 2 cm3 of Benedict’s
solution and boil gently
for 1 minute.2.5mks
(b) (i) Identify the process being investigated in test (a)(iv). (01marks)
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(ii) Explain the effect of saliva on maize flour. (02 marks)
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2. You are provided with specimen P, Q, R and T. Examine them, and answer questions that
follow.
(a). With reasons, identify specimen P and R (03 marks)
(i) Identity of P
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Reasons
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(ii) Identity of R
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Reasons
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(b) Describe the structure of specimen Q and S. (04 marks)
(i) Specimen Q
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(ii) Specimen S
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(c) (i) State, two similarities between specimen R and S. (02 marks)
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(ii) Give two differences between specimen P and Q. (02 marks)
specimen P specimen Q
(d) How is specimen P adapted to its functions? (04 marks)
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(e) Draw and label specimen P. (05 marks)
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© Aceiteka Joint Mock Examinations 2023
3. You are provided with specimen E, F, G and H which are plant organs. Cut specimen F
longitudinally
(a) With reasons, state the identity of specimen E and H. ( 03 marks)
(i) Identity of specimen E
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Reason
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(ii) Identity of specimen H
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Reason
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(b) Giving reason, state the plant division to which specimen F belongs. (02 marks)
(i) Plant division
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(ii) Reason
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(c) Describe the structure of specimen G. (03 marks)
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(d) Describe the arrangement of flesh leaves of specimen F. (02 marks)
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© Aceiteka Joint Mock Examinations 2023
(e) Specimen E, F, G and H, perform a common function. Explain how the specimen are able to
perform their common function. (03 marks)
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(f) Give two differences between specimen E and H. (02 marks)
specimen E specimen H
(g) Draw and label the longitudinal section of specimen F. (05 marks)
END
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