Biology 9700/36 Oct Nov 2015 | Cambridge AS Level Past Papers With Mark Scheme

1. Water potential and osmotic effects on onion epidermal cells, including plasmolysis in sodium chloride solution and rehydration in distilled water.

2. Microscopic observation of structural changes in cells stained with iodine solution, emphasizing cell wall integrity.

3. Calculation of percentage plasmolysis by quantifying cells showing varying degrees of water loss in different osmotic environments.

4. Surface area measurement of rolled versus unrolled leaf epidermis to assess xerophytic adaptations for water conservation.

5. Transpiration rates in tomato plants correlated with the number of leaves, with graphical interpretation of transpiration trends.

6. Comparative anatomical analysis of mid-rib sections in leaves from different plant species, identifying vascular tissue differences..