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Scientific processes

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Question 58

An agricultural experiment investigates how the concentration of a dissolved organic bio-fertilizer affects the root development of Arabidopsis thaliana specimens. Seedlings of identical initial height are grown in a climate-controlled greenhouse. Group 1 is treated with a 0.5% concentration solution of the bio-fertilizer (Condition A), while Group 2 is treated with a 2.0% concentration solution (Condition B). After exactly 14 days, the total dry root biomass of each specimen is measured and recorded.

Select from the option letters below (A, B, C, D or E) to identify the independent variable and the dependent variable in this study.

Type of variableLetter
Independent variable[ ]
Dependent variable[ ]

Options:

  • A: The initial height of the seedlings.
  • B: The total dry root biomass of the specimens.
  • C: The concentration of the dissolved organic bio-fertilizer (0.5% or 2.0%).
  • D: The volume of nutrient solution supplied daily to each group.
  • E: The duration of the growing period (14 days).
[2]

Scientific processes Questions

  1. A Level
  2. /Psychology
  3. /Scientific processes

Practise AQA A Level Psychology Scientific processes with exam-style questions for A Level Psychology. 689 questions, matched to the AQA A Level Psychology (7182) specification and written in Paper 1, Paper 2 and Paper 3 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.

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