2024_bio_olevel_mj_paper3

Extracted Content: 2024_bio_olevel_mj_paper3

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Candidate Name Centre Number Candidate Number

F

ZIMBABWE SCHOOL EXAMINATIONS COUNCIL

General Certificate of Education Ordinary Level

4025/3

1 hour 30 minutes

BIOLOGY

PAPER 3 Practical Test
JUNE 2024 SESSION

Candidates answer on the question paper

Additional materials:

As listed in Instructions to Supervisors
Electronic calculator

Ruler (cm/mm)

Pencil (B or HB is recommended)
Soft clean eraser

INSTRUCTIONS TO CANDIDATES

FOR EXAMINER’S USE

Write your name, centre number and candidate number in
the spaces at the top of this page.

INFORMATION FOR CANDIDATES

The number of marks is given in brackets [ ] at the end of
each question or part question.

This question paper consists of 8 printed pages.

Copyright: Zimbabwe School Examinations Council, J2024.

© ZIMSEC 32024 [Turn over

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Candidate Name Centre Number Candidate Number

2
Answer all questions. For
j . - dy arte) A ; Examiner’
Write your answers in the spaces provided on the question paper. Use

Use a sharp pencil for your drawings.
Coloured pencils and crayons should not be used.

1. You are required to investigate the effect of insulation on temperature loss in
mammals using a model.

You are provided with:

two test tubes

a thermometer

insulating materials X and Y
hot water

two beakers

a measuring cylinder

a stop watch

Proceed as follows:

Place the insulating material X into a beaker.

Completely cover all the sides of the beaker.

Place the test tube in the middle of the beaker, make sure it is covered by the insulating
material as shown in Fig. 1.1.

Measure 15 cm of hot water, put it into the test tube.

Measure the initial temperature and record it in Table 1.1.

Read and record the temperature at two minute intervals for 10 minutes.

Repeat the procedure using insulating material Y.

ctecctenaeioceemencecmnnen PBBt HHS

ons BEAL CORRAIHeE

ean insulating material

Fig. 1.1
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Candidate Name Centre Number Candidate Number | For

8 Examiner’
Use

(a) @ Table 1.1

Gi) Plot a graph of temperature (vertical axis) against time (horizontal axis)
for the results for insulating material Y.

:
i
i
3
i
3
q
i

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4 (iii) Describe the results in Table 1.1. For Examiner’ Use [2] (iv) Explain the difference between the results for insulating material X and insulating material Y. (b) (i) Identify the insulating material more effective in reducing heat loss. 0) (ii) Suggest any safety precautions taken into consideration during the procedure. [2]

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IT

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er )

Candidate Name

(ii)

(iv)

Centre Number Candidate Number

State, with a reason, one improvement to the procedure to obtain more
accurate results.

improvement,

reason.

[2]
Identify any one limitation of the set up in representing real insulation
process in mammals.

[Total: 20]

For
Examiner’
Use

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- SS

Candidate Name Centre Number Candidate Number

6

You are required to investigate the presence of protein in different food samples.
You are provided with the following:

four food samples labelled as S1, $2, $3 and S4.

sodium hydroxide solution

four test tubes

a syringe

means of labelling glassware

a dropper

copper sulphate solution

a test tube rack

access to a stop watch/clock
Proceed as follows:

Label four test tubes as A, B, C and D.

Add2cm of $1 into test tube A.

Add2cm of $2 into test tube B.

Add 2m of $3 into test tube C.

Add2cm of $4 into test tube D.

Add 2 cm of sodium hydroxide to each of the test tubes A, B, C and D.

NB: Sodium hydroxide solution is corrosive, avoid skin contact.

Add two drops of dilute copper sulphate solution to each of test tubes A, B, C and D. Shake
the test tubes gently.

Place the tubes in a test tube rack and leave for two minutes.

After two minutes, record the observations and conclusions made in Table 2.1.

{a) @ Table 2.1

observation on adding
sodium hydroxide and copper|conclusion

ANPSR/D TONIA.

For
Examiner”
Use

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Candidate Name Centre Number Candidate Number For

7 Examiner’
Use

(ii) State a reason for shaking the test tubes.

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(iii) —_ Identify, with a reason, the test tube with the highest protein concentration.

(iv) State, with a reason, the test tube serving as the control.
test tube

reason

[2]
(v) Recommend, with a reason, the food source most suitable for a child
showing symptoms of kwashiorkor.

food source

reason

—

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For Use

(b) @ Plan and organise an investigation on the presence of lipids in any of
the food sources in (a).

[Al

Gi) State a safety precaution taken when carrying out the investigation in (b)(i)|

[Total: 20]

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88356

© Zimsec 2024

4025/2 J2024

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