Biology 9700/53 May June 2014 | Cambridge AS Level Past Papers With Mark Scheme

1. Genetic variation study using RNA probes, DNA amplification, and AFLP for analyzing nucleotide differences within species.
2. Gel electrophoresis procedures for separating and locating DNA fragments, and standardization of variables for experimental reliability.
3. Green manuring effects on Sorghum yield using different legume parts, with experimental design including randomization and control plots.
4. Calculation of percentage increases and ratios in Sorghum dry mass based on legume treatment data, emphasizing statistical analysis for significance.
5. Interpretation of t-test results for evaluating treatment effects, null hypothesis formulation, and explanation of statistical significance at P < 0.05 level.
6. Conclusions on Sorghum growth improvement due to green manuring, highlighting comparative efficiency of shoots and roots for soil fertilization.