Biology 9700/05 Oct Nov 2005 | Cambridge AS Level Past Papers With Mark Scheme

1. Plasmolysis experiment: effects of distilled water and solutions A and B on red onion epidermal cells; observations of cell turgidity, cytoplasmic shrinkage, and recovery upon rehydration.

2. Microscopic examination: drawing of cells under different solutions, illustrating variation in plasmolysis severity due to osmotic conditions.

3. Comparison of cell responses: effects of isotonic, hypertonic, and hypotonic solutions on cell appearance and content arrangement.

4. Mitotic stages: identification of prophase, metaphase, anaphase, and telophase in root tip cells using photomicrographs, with sequence determination.

5. Meiosis analysis: evidence of metaphase I in cell X from homologous chromosome alignment; comparison with mitotic cells in root tip sections.

6. Functional distinctions: meiosis vs. mitosis roles, explaining absence of meiosis-specific configurations like homologous chromosome pairing in somatic cell division.