O Level Biology Practical 2020 Answers Access

Connect points with a smooth curve or straight, ruled lines from point to point, depending on the instructions.

Always mention standard safety protocols when writing methods, such as wearing safety goggles when handling chemicals or using a water bath instead of an open flame to heat flammable substances like ethanol.

Always mention wearing goggles and using caution with hot liquids or Benedict's reagent. 4. Conclusion o level biology practical 2020 answers

Water moved into potato cells by osmosis down a water potential gradient, making cells turgid (increase in length/mass).

For official past papers and examiner reports, refer to (Past Papers section) or your local examination board’s 2020 practical series. Connect points with a smooth curve or straight,

Leo stared at the tray in front of him: a row of test tubes, a stopwatch, and a mysterious beaker of yeast suspension

Add 2–3 drops of iodine solution directly to Sample X on a tile. Expected Observations & Interpretation: Solution remains yellowish-brown: Starch absent. Solution turns blue-black: Starch present. Experiment 2: Investigating Rate of Enzyme Activity Leo stared at the tray in front of

Answer: By repeating the experiment multiple times, using similar equipment and methods, and controlling variables such as temperature and light source.

. The task seemed simple enough on paper—investigate the effect of temperature on the rate of respiration—but his hands were shaking as he gripped the pipette.

: Students performed the Benedict’s test. Successful responses required a structured table with correct headings (e.g., sample name, time taken for color change, and final glucose concentration).

Paper 3 (Practical Test) or Paper 6 (Alternative to Practical - ATP).