The June 2021 OCR Science GCSE Paper 7 assesses biological concepts, focusing on transport systems, cellular structures, and physiological processes. Key topics include osmosis, photosynthesis, anaerobic respiration, and hormonal regulation. Questions test understanding of the circulatory and gas exchange systems, the role of phloem and xylem in plants, and enzyme activity under varying conditions. Students analyze experimental data, calculate rates, and interpret graphical trends. Practical applications like measuring water uptake and investigating plasmolysis are emphasized. Keywords: GCSE Biology, transport systems, osmosis, photosynthesis, enzymes, cellular respiration, experimental biology.