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Scientific processes

Scientific processes

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Question 74

A marine biologist is investigating the impact of marine microplastic pollution on the filter-feeding efficiency of the Mediterranean mussel (Mytilus galloprovincialis).

She sets up two experimental conditions:

  • Group A: Mussels are placed in clean, filtered seawater (0 microplastic particles per litre).
  • Group B: Mussels are placed in seawater contaminated with high-density polyethylene microplastics (150 microplastic particles per litre).

The filtration rate is quantified by measuring the volume of algae-rich water cleared of particles in millilitres per hour per mussel ("mL"⋅"h"−1"⋅""ind"−1"\text{mL}"\cdot"\text{h}"^{-1}"\cdot""\text{ind}"^{-1}"mL"⋅"h"−1"⋅""ind"−1).

Write a suitable directional (one-tailed) hypothesis for this study.

[2]
Markscheme

Scientific processes Questions

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

689 exam-style questions on AQA A Level Psychology Scientific processes. Each one has a worked solution and a mark scheme showing where the marks go.

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