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| Focus: Choice of materials to suit particular purpose. | ||||||
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%
responses 2000 ('96) |
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y4
|
y8
|
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| 1.
There is a problem. Birds keep on eating the nice, juicy strawberries.
How do you think the problem could be fixed? Pause for answer. |
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One idea for fixing
the problem is to put a cover on a frame, then put the covered frame
over the strawberry patch. Here is a plan of a frame to help you think
about that idea. Show student
the plan. |
 |
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| 2. Which material do you think is the most suitable one to use? |
fine
plastic netting, 3cm holes |
8
(8) |
12
(9) |
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black
polythene sheet |
19
(13) |
5
(6) |
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windbreak
cloth |
30
(40) |
30
(35) |
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plastic
netting, 5cm holes |
3
(3) |
3
(1) |
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chicken
wire, 1cm holes |
40
(36) |
50
(49) |
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| 3. Why would that material be the best to use? |
unable
to be penetrated by birds size of mesh |
78
(79) |
85
(86) |
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allows
sun through |
14
(8) |
37
(35) |
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allows
moisture through |
8
(7) |
16
(20) |
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creates
good conditions for growth |
9
(17) |
17
(22) |
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easy
to work with |
4
(2) |
8
(4) |
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| 4. What do you think would be best for attaching the cover to the wood? |
glue
|
8
(5) |
2
(0) |
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nails
|
33
(32) |
20
(16) |
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PVC
insulation tape |
18
(7) |
4
(5) |
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drawing
pins |
2
(0) |
1
(2) |
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wire
staples |
33
(45) |
66
(68) |
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polypropylene
string |
6
(11) |
7
(9) |
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| 5. How would you use this fastening (or these fastenings) to attach the cover to the wood? | ||||||
| 6. Explain why you think that would be the best way to attach the net to the wood. |
responses
to 5 & 6 practicality, durability |
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strong
|
10
(6) |
17
(13) |
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moderate
|
39
(47) |
50
(53) |
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weak
|
49
(46) |
32
(33) |
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none
|
3
(1) |
1
(1) |
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| Commentary:
About 15 percent more year 8 than year 4 students gave good explanations for their choice of materials and method of attachment. Little change was evident between 1996 and 2000 for year 4 or year 8 students. |
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