A student investigated the rate of photosynthesis by measuring the volume of oxygen gas collected from pondweed exposed to a light source at different distances. The table below shows the results of this investigation:
Distance of lamp (cm)Volume of oxygen collected in 15 minutes (cm3)Rate of photosynthesis (cm3/hour)101.87.2201.35.2300.9Y400.52.0500.20.8\begin{array}{|c|c|c|} \hline \textbf{Distance of lamp }(\text{cm}) & \textbf{Volume of oxygen collected in 15 minutes }(\text{cm}^3) & \textbf{Rate of photosynthesis }(\text{cm}^3/\text{hour}) \\ \hline 10 & 1.8 & 7.2 \\ \hline 20 & 1.3 & 5.2 \\ \hline 30 & 0.9 & Y \\ \hline 40 & 0.5 & 2.0 \\ \hline 50 & 0.2 & 0.8 \\ \hline \end{array}Distance of lamp (cm)1020304050Volume of oxygen collected in 15 minutes (cm3)1.81.30.90.50.2Rate of photosynthesis (cm3/hour)7.25.2Y2.00.8
Calculate the value of YYY in the table.
54 exam-style questions on AQA GCSE Biology 4.1 Photosynthesis, covering 4.1.1 Photosynthetic reaction, 4.1.2 Rate of photosynthesis, and 4.1.3 Uses of glucose from photosynthesis. Each one has a worked solution and a mark scheme showing where the marks go.