A student investigated the effect of nitrate ion concentration on plant growth - Edexcel - GCSE Biology - Question 7 - 2018 - Paper 1
Question 7
A student investigated the effect of nitrate ion concentration on plant growth. She placed barley seedlings in three test tubes containing different concentrations o... show full transcript
Worked Solution & Example Answer:A student investigated the effect of nitrate ion concentration on plant growth - Edexcel - GCSE Biology - Question 7 - 2018 - Paper 1
Step 1
Set up the apparatus as shown in figure 13
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Answer
To ensure a valid control, the apparatus should be set up in a similar manner as used for the experiment. However, replace the nitrate solution with distilled water instead, and do not add any nitrate pellets.
Step 2
Maintain other experimental conditions
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Answer
Ensure that the environmental conditions such as light, temperature, and watering are kept consistent with those of the experimental groups, so that any changes in plant growth can be attributed solely to the varying concentration of nitrates.
