Science P6 NYPS 2018 SA1 Q10

Benjamin conducted three experiments on food relationships in a community consisting of a plant, P, and three populations of consumers, Q, R and S. Food was available for each organism in each experiment.He set up the experiments for one week and recorded his observations in the table as shown below.
ExperimentOrganismsPopulation size at the end of the experiment
1Pdecreases
Qremains the same
Rdecreases
2Pdecreases
Qdecreases
Rremains the same
3Pdecreases
Qremains the same
Rdecreases
Based on the above results, which one of the following shows a possible food relationship between organisms P, Q, R and S?