O Level Biology Practical 2020 Answers

Many papers asked to plot percentage change in mass (Y-axis) against concentration (X-axis).

Rate of transpiration increases with temperature, air movement, and light intensity; decreases in high humidity.

Examiners frequently ask students to identify limitations in the experimental design and suggest realistic improvements. Identified Error / Limitation Practical Impact Proposed Improvement o level biology practical 2020 answers

Mastering the requires a solid grasp of core biological concepts, precise experimental skills, and an understanding of how Cambridge examiners award marks. The 2020 O Level Biology Practical exams (both Paper 3 Practical Test and Paper 6 Alternative to Practical) featured distinct experiments focusing on plant physiology, enzyme activity, and biochemistry.

Unknown solutions X, Y, Z tested for reducing sugars, starch, protein, and fat. Many papers asked to plot percentage change in

Always double-check that your measurements have correct units attached ( cm3cm cubed

A common mistake noted by students was cutting specimens (like limes) in a longitudinal section (LS) instead of the required transverse section (TS) precise experimental skills

Good luck with your O Level Biology revision. Master the 2020 practical answers, and you will be ready for any food test, osmosis, or enzyme question that comes your way.

Explanation : High temperatures denature the proteins embedded in the cell membrane and disrupt the phospholipid bilayer. This makes the cell membrane fully permeable, allowing the vacuolar red pigment (betalain) to leak out rapidly via diffusion.