O Level Biology Practical 2021 Answers -

“Why did the tube with boiled amylase show no starch breakdown after 10 minutes?”

Practical tasks also required candidates to measure rates of transpiration or examine plant structures adapted to their environments. o level biology practical 2021 answers

Cell membranes are partially permeable, whereas agar is generally fully permeable to small molecules. Uniformity: “Why did the tube with boiled amylase show

Proteins are too large to pass through. If Solution B contained protein, a Biuret test on Solution A would remain blue (negative). If Solution B contained protein, a Biuret test

Using a potometer or measuring changes in mass/volume to determine how quickly a plant loses water.

The 2021 O Level Biology Practical exams focused on core experimental skills, including nutrient testing, diffusion through membranes, and plant transpiration. Whether you are reviewing for past paper practice or understanding examiner expectations, these insights cover the critical components of the 2021 practical assessments.

To ensure the concentration of solutions (like hydrogen peroxide) is accurate, you should use a volumetric pipette or syringe rather than a measuring cylinder.