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Scientists set up three experiments to investigate the effect of watering plants with solutions containing different masses of nitrate fertiliser - Edexcel - GCSE Biology - Question 5 - 2016 - Paper 1
Question 5
Scientists set up three experiments to investigate the effect of watering plants with solutions containing different masses of nitrate fertiliser. Plants were water... show full transcript
Worked Solution & Example Answer:Scientists set up three experiments to investigate the effect of watering plants with solutions containing different masses of nitrate fertiliser - Edexcel - GCSE Biology - Question 5 - 2016 - Paper 1
Step 1
Using information from the table, describe the effect of nitrate fertiliser on the growth of these plants.
Answer
As the mass of nitrate fertiliser increases, so does the height of the plant. For example, with 0.1 g of nitrate fertiliser, the average increase in height was 32 mm, while with 0.5 g, the average increase was 58 mm. This demonstrates a positive correlation between the amount of nitrate fertiliser and plant growth.
Step 2
Calculate the difference in growth per week for the plants watered with solutions containing 0.1 g and 0.5 g of nitrate fertiliser.
Answer
For 0.1 g, the mean increase in height is 32 mm over 4 weeks. For 0.5 g, the mean increase is 58 mm over the same period. The difference in height growth is:
58 - 32 = 26 mm over 4 weeks.
To find the weekly growth difference, we divide by 4:
rac{26}{4} = 6.5 mm per week.
Step 3