An environmental biotechnologist is investigating the lipid production of two different marine microalgae species, Tetraselmis suecica and Chlorella vulgaris, to determine which is more effective for high-yield biofuel extraction when cultured under nitrogen-depletion conditions.
The researcher reviews several academic databases but finds no prior published scientific literature or comparative studies directly comparing the lipid accumulation rates or total lipid yields of these two specific species under nitrogen-deprived conditions.
The researcher sets up 25 controlled photobioreactors for each species:
After a 14-day cultivation period under identical light and temperature regimes, the dry lipid biomass (g L−1g\text{ L}^{-1}g L−1) is harvested and measured for each bioreactor.
Based on the study described above, state whether a directional or a non-directional hypothesis is more appropriate for this investigation. Explain your reasoning.
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.
