Download and practise with this ZIMSEC O-Level Combined Science Paper 3 question paper. Useful for exam revision, past paper practice, and preparation in Zimbabwe.
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This is the ZIMSEC O-Level Combined Science question paper for Paper 3. Use it for exam practice under timed conditions. The paper code is 4003/3. Time allowed: 20 minutes.
COMBINED SCIENCE PRACTICALS 2018-2021 MR MUCHATUTA 0779482512 / 0782975126
2
1. You are required to investigate the effect of concentration on plant tissue.
For
Examiner's
You are provided with 5 potato cylinders placed in distilled water, four
Use solutions, A, B, C and D, in beakers, a stop watch and a ruler.
The length of each of the five potato cylinders was 5 cm before being placed in distilled water and left over night.
(a) (i) Measure the initial length of each of any four cylinders and record it
1 in Table 1.1.
\begin{table}
\captionsetup{labelformat=empty}
\caption{Table 1.1}
solution | initial length/cm | final length/cm | change in length/cm
A | & |
B | & |
C | & |
D | & |
\end{table}
[11]
Place one potato cylinder in each of the corresponding solutions, A, B, C and D, and immediately start a stopwatch. Leave the apparatus to stand for twenty minutes while you proceed to question 2.
After 20 minutes, measure the final length of each cylinder and record it in Table 1.1.
Calculate and record the change in length in Table 1.1.
(ii) Beside the change in length, state any other observation made between potato cylinders in distilled water and those from the solutions.
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[1]
4003/3 Specimen paper