Biology 9700/53 May June 2010 | Cambridge AS Level Past Papers With Mark Scheme

1. Transpiration rates in mesophytes and xerophytes using potometers, with calculations for water loss based on leaf surface area.
2. Experimental designs for measuring transpiration rates and methods for calculating water volume loss using capillary tubes.
3. Statistical analysis of water loss differences between mesophyte and xerophyte leaves, using suitable tests to evaluate significance.
4. Loss of mass in leaves with wax-covered surfaces to determine transpiration through stomatal regions and conclusions about surface-specific water loss.
5. Effects of glutamine and glutamic acid concentrations on fibroblast cell growth, emphasizing proportional increases and optimal conditions for growth.
6. Experimental controls in fibroblast investigations, highlighting nutrient consistency and culture maintenance to ensure reliable results.