Page 18 - 新思维科学活动用书9 样章

1.2 More about photosynthesis

Sofia and Zara do the investigation again, but this time they put the beaker and the leaf discs in

a room with only dim light.

Here are the girls’ results from both tests.

Time taken for leaf disc to rise to the surface, in seconds

Conditions Try 1 Try 2 Try 3 Try 4 Try 5 Mean

bright light 14 3 12 14 11

dim light 44 66 69 77 71

4 Suggest the hypothesis that the girls were testing.

5 What was the independent variable in the girls’ experiment?

6 Sofia thought that there was one anomalous result in each row of their results table.

Draw circles around the two anomalous results in the table.

7 Calculate the mean time taken for each row in the results table. Write your answers in the last
column.

Remember not to include anomalous results when you calculate the mean.

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