You need to understand and know the methods for each of the biology required practicals. We have recently carried out the photosynthesis required practical. Here is a video to recap, have a go at answering the key questions below. Key Questions: 1. What was the purpose of the investigation? 2. What is the independant variable? (what we change) 3. What is the independent Variable? (whar we mesure) 4.. What are the controls? ( what we keep the same to ensure we have a fair test) Deeper thinking : How could we improve our method?