2019_bio_olevel_mj_paper3

Extracted Content: 2019_bio_olevel_mj_paper3

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andidale Name
Centre Number

Cane

ZIMBABWE SCHOOL EXAMINATIONS COUNCIL

General Certificate of Education Ordinary Level

| BIOLOGY 4025/3

PAPER 3 Practical test
|
JUNE 2019 SESSION 1 hour 30 minutes

| Candidates ans i
| answer on the question paper

Additional materials:
As listed in Instructions to Supervisors
Electronic calculator
Pencil (B or HB is recommended)
Soft clean eraser
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. roreeers USE
Coloured pencils and crayons should not be used.
INFORMATION FOR CANDIDATES : \
TOTAL
\

The number of marks is given in brackets [ ] at the end of each

question or part question.

Copyright: Zimbabwe School Examinations Council, J2019.

©ZIMSEC J2019
100

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patanila, a SCLssors

You are required [0 |
iy bending and SC
You are provided witl

some SUPE. paper pil
oii ke the model of
sprowent musoles, Wit '
U the mantla lo represen bones and (he elrinay, (Ore pros
sing, the mi R

(i)
the arm. re vided
Paste the model in the bent position in the space prove
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(ii) Label, on the model, the parts of the arm represented by cach n

component

odel does not correctly represent the arm.

(iii) Explain how the m

You are required to investigate how tooth decay occurs and how it can be prevented.

You are provided with two egg shells, dilute hydrochloric acid and hydrochloric acid-toothpaste
mixture.

NB: Hydrochloric acid is corrosive, avoid skin contact.
Proceed as follows:

Put an egg shell into beaker A.

Add hydrochloric acid to cover the egg shell.

Put the other egg shell into beaker B.

Add hydrochloric acid-toothpaste mixture to cover the egg shell.

Leave the set up for five minutes.

Afier five minutes, observe and record any changes in the egg shells from beakers A and B

@

A

4025/3 J2019

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(b)

di) Explain any diffe
from beaker B

shell from beaker A and the egg shell

(iii) Draw a conclusion from the observations iitade

(iv) Suggest a substitute for toothpaste.

You are required to investigate the distribution of stomata on leaves.

You are provided with hot water and two fresh leaves, A and B.

Dip leaf A into hot water in a beaker.

Observe the upper and lower surface of the leaf while it is still dipped in water.

(i) Record and explain the observations made for the upper surface and lower surface of the
leaf.

observation

explanation on

Explain the significance of the observation in (a)(i) to a plant.

(ii)

Draw a labelled diagram of leaf B.

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hof leaf B

(ii) Measure and record the leng
mn [ll

length of leaf B
UW

length of drawing

(iii) Calculate the magnification of the drawing.

magnification in

(iv) Design an experiment to test a leaf for starch.

(v) Suggest any 0. ecautio; Ww airying oul ee ent
ne precautt n taken when c yi
2 the x<perim: i
mt in

(b) (iv).

4025/3 J2019

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