📄 Exam Questions & Readable Text Transcript
Full OCR-extracted text of questions, syllabus codes, and exam instructions.
Extracted Content: 4025q3Specimen paper
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Candidate Name Centre Number Candidate NumberFor Perf
ZIMBABWE SCHOOL EXAMINATIONS COUNCIL
General Certificate of Education Ordinary Level
BIOLOGY 4025/3
PAPER 3 Practical Test
SPECIMEN PAPER 1 hour 30 minutes
Candidates answer on the question paper.
Additional materials:
As listed in Instructions to Supervisors
Electronic calculator Soft clean eraser
Pencil (B or HB is recommended) ruler (cm/mm)
TIME | 1 hour 30 minutes
INSTRUCTIONS TO CANDIDATES
Write your name, Centre number and candidate number in the spaces at the top of this page.
Answer all questions.
Write your answers in the spaces provided on the question paper.
Use a sharp pencil for your drawings. Coloured pencils and crayons should not be used.
INFORMATION FOR CANDIDATES
The number of marks is given in brackets [ ] at the end of each question or part question.
FOR EXAMINER’S USE
This question paper consists of 8 printed pages.
Copyright: Zimbabwe School Examinations Council, Specimen paper.
@ZIMSEC SPECIMEN PAPER [Turn over
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(a)Y ou are provided with one thin slice of fruit P for question 1 (a), one
thick slice of fruit P for question 1 (b)and one thick slice of another fruit Q
for question 1(c).
Proceed as follows:
1. Place the thin slice of fruit P on a white tile provided and cut the
slice into two equal parts through the diameter.
2. Remove the central fleshy area of each half of the thin slices of fruit
P leaving the outer edge about 2-3 mm thick.
(1) Draw sketches of the strips in the spaces provided in Table 1.1 and
Table 1.2 at the beginning of the experiment.
Table 1.1
strip at the beginning strip in distilled water after 40
minutes
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Table 1.2strip at the beginning strip in sucrose solution after
40 minutes
[2]
3. Place one strip in a petri dish containing distilled water and the other
in a petri dish containing sucrose solution.
4, Leave the strips in the dishes for 40 minutes.
During this time, continue with question 1 (b)and (c).
di Observe and draw sketches of the strips in Tables 1.1 and 1.2after 40
minutes.
(iii) Explain the changes in shape of the strip in:
distilled water,
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: For sucrose solution. Examiner'sCO Use
(b) @ Make a large, labelled drawing of a cross-section of the thick
slice of fruit P.
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5di Calculate the magnification of the drawing.
diameter ofslice mm
diameter ofdrawing ee mm
Magnification [3]
(©) Complete Table 1.3 to compare the thick slices of fruits P and Q by listing
one visible similarity and three visible differences.
Table 1.3
similarity
differences | 1.
[4]
[Total: 20]
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(a)6
Y ou are required to prepare a slide of onion cells.
Proceed as follows:
1. Cut a small square piece (10 mm x 10 mm) from the onion that has
been provided to you.
Add a few drops of distilled water on the microscope slide.
Peel off the epidermis of the onion square.
Lay the onion epidermis flat on the surface of the wet slide.
Add a drop of iodine solution to the onion epidermis.
a oF WN
Place the cover slip over the onion epidermis and gently press it
down.
7. Drain excess fluid from the slide using filter paper.
8. Let the slide stand for 2-3 minutes.
View the slide on a light microscope.
@ Draw and label cells of the onion epidermis as viewed at x 10.
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(b)7
(ii) Draw and label cells of the onion epidermis under high power.
Magnification x 40
Suggest reasons for the following procedures.
(1) Adding a few drops of water onto the slide before placing
the onion epidermis.
(ii) = Adding a drop of iodine on the onion epidermis.
(iii) Placing the cover slip over the onion epidermis.
(iv) Allowing the slide to stand for 2-3 minutes before viewing on a
microscope.
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©v)
Gi)
8
Gently pressing the cover slip.
Name cell structures that you observed on the onion cells
that can also be observed on an animal cell.
[Total: 20]
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