2 2 How do we do a fair test? 1. After discussion, the pupils decided to use the method below to test if light intensity affects plant growth. Experiment design translucent box
1
There are small holes at the bottom of the box to let air in.
Plant A
Plant B
2. Based on the method chosen by the pupils, answer the three questions below. Put a 3 in the correct . (There can be more than one answer.)
Three questions to be considered for fair testing
How does light intensity affect plant growth?
(1) What factor should be tested?
How does the amount of water affect plant growth?
the sizes of the leaves
(2) What variable should be measured?
the heights of the stems
supply of air
stage of growth of the seedlings
(3) What other factors
should be controlled?
water in the soil
time for sunlight exposure
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