A plant can establish only where the mean summer temperature is from 14∘C14^{\circ}\text{C}14∘C to 18∘C18^{\circ}\text{C}18∘C inclusive and summer rainfall is at least 100 mm .
The table gives conditions at three sites before and after an environmental change.
| Site | Temperature before / ∘C^{\circ}\text{C}∘C | Rainfall before / mm | Temperature after / ∘C^{\circ}\text{C}∘C | Rainfall after / mm |
|---|---|---|---|---|
| P | 13 | 130 | 15 | 110 |
| Q | 16 | 120 | 18 | 90 |
| R | 18 | 105 | 20 | 105 |
Assume seeds reach every site and other conditions remain suitable.
Which prediction and explanation are both correct?
The plant changes from Q and R to P and Q; warming creates suitable temperatures at P and maintains them at Q.
The plant changes from Q and R to P and R; rainfall remains sufficient at P and R despite the temperature change.
The plant changes from Q alone to P alone; both the original temperature at R and the later rainfall at Q are unsuitable.
The plant changes from Q and R to P alone; Q becomes too dry and R becomes too warm for establishment.
40 exam-style questions on AQA GCSE Biology 7.2 Organisation of an ecosystem, covering 7.2.1 Levels of organisation, 7.2.2 How materials are cycled, 7.2.3 Decomposition, and 7.2.4 Impact of environmental change (HT only). Each one has a worked solution and a mark scheme showing where the marks go.