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How Plants Feed : 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.

 Plants grown in the LightColour of leaves =GREEN 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
 Plants grown in the DarkColour of leaves =YELLOW 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

 1. Calculate the average length of the stems and the average size of the leaves for both sets of plants. Plants grown in the light Average length of stems = Average size of the leaves = Plants grown in the dark Average length of stems = Average size of the leaves = 2. Why is it better to measure ten plants from each experiment rather than just one plant from each? 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 grownin the dark. 4. What are your conclusions? Hint: How can you explain these differences? 5. If you could continue this experiment for another four weeks, what would you expect to happen to the plants?