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How Plants Feed
Reference chapter
Question 6
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Mustard seeds were germinated in the light and in the dark. After
they had grown for one week, the length of the stem, the size of the leaves and
the colour of the leaves were recorded for ten plants.
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Plants grown in the Light
Colour of leaves =
GREEN
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Plant |
Length of stem (mm) |
Size of leaf (mm) |
1 |
28 |
15 |
2 |
25 |
13 |
3 |
20 |
11 |
4 |
17 |
10 |
5 |
24 |
14 |
6 |
21 |
9 |
7 |
15 |
13 |
8 |
26 |
12 |
9 |
23 |
10 |
10 |
19 |
14 |
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Plants grown in the Dark
Colour of leaves =
YELLOW
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Plant |
Length of stem (mm) |
Size of leaf (mm) |
1 |
75 |
6 |
2 |
80 |
6 |
3 |
81 |
6 |
4 |
89 |
4 |
5 |
73 |
5 |
6 |
83 |
5 |
7 |
68 |
7 |
8 |
86 |
6 |
9 |
93 |
4 |
10 |
89 |
5 |
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1. Calculate the average length of the stems and the average size of the leaves for both sets of plants. |
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2. Why is it better to measure ten plants from each experiment rather than just one plant from each? |
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3. What do you observe from these results?
Hint: Describe, in your own words, the differences between the plants grown in the light and the plants grown in the dark. |
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4. What are your conclusions?
Hint: How can you explain these differences? |
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5. If you could continue this experiment for another four weeks, what would you expect to happen to the plants? |
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© Paul Billiet & Shirley Burchill 2012
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