Microscopy and cell observation
The O Level Biology Practical exam is designed to test students' ability to:
As the students collected their data, they began to notice a trend. The closer the lamp was to the plant, the more oxygen was produced. This made sense, as higher light intensities provide more energy for photosynthesis to occur.
Mastering the O Level Biology Practical: 2020 Answers and Techniques (5090) o level biology practical 2020 answers
0.4 M sucrose (isotonic point – water potential equal inside and outside cells).
Always record time to the nearest second and use a measuring cylinder for precise volumes.
: Enzymes are specific; the active site of catalase is complementary in shape only to the hydrogen peroxide substrate. Microscopy and cell observation The O Level Biology
Use a ruler to draw straight, horizontal label lines that touch the specific structure. Do not cross your label lines. Calculating Magnification
Magnification=Size of Image (Drawing)Actual Size of SpecimenMagnification equals the fraction with numerator Size of Image (Drawing) and denominator Actual Size of Specimen end-fraction Steps to Solve: Measure the length of your drawing in millimeters (
(Note: This analysis focuses on the widely sat format. If you are sitting a different exam board, the concepts regarding planning and data analysis will still apply.) Mastering the O Level Biology Practical: 2020 Answers
: Final colours typically ranged from blue (Sample D, 0 g/dm³) to brick-red (Sample B, highest concentration/shortest time).
Magnification=Size of Image (your drawing)Size of Actual SpecimenMagnification equals the fraction with numerator Size of Image (your drawing) and denominator Size of Actual Specimen end-fraction
Based on the 2020 examination trends, the practical papers focused heavily on: