1. Food Webs and Ecosystem Interactions: Identification of producers, primary and secondary consumers, impact of pesticides on food chains, and trophic level relationships in a woodland ecosystem. 2. Osmosis and Plant Cells: Investigating the effect of sucrose concentration on potato tissue, calculating percentage change in mass, and explaining experimental steps to ensure accuracy in osmosis investigations. 3. Respiration and Gas Exchange: Differences in inhaled and exhaled air, investigating carbon dioxide concentration using limewater, measuring breathing rate changes during exercise, and analyzing experimental reliability. 4. Blood Composition and Circulatory System: Comparing normal and abnormal blood samples, calculating red blood cell count in human blood volume, determining magnification in microscopy, and analyzing the impact of blood disorders. 5. Genetics and Inheritance: Alleles and inheritance of hair length in guinea pigs, genetic crosses using Punnett squares, probability calculations for offspring traits, and methods to determine heterozygosity in organisms. 6. Nervous System and Reflex Actions: Components of the reflex arc, calculation of nerve impulse transmission time, differences in response time due to synaptic delay, and identifying sensory, relay, and motor neurons.