O Level Biology Practical: 2020 Answers

Create precise data tables with correct SI units.

The factor you measure (e.g., the time taken for the iodine solution to stop turning blue-black).

Convert the actual size given in the question to the same units ( Divide the drawing size by the actual size. o level biology practical 2020 answers

| pH | Color Change | Amylase Activity | | --- | --- | --- | | 4 | Blue-black | Low | | 5 | Purple | Moderate | | 6 | Brown | High | | 7 | Yellow-brick red | Very high | | 8 | Yellow-brick red | Very high |

[O Level] 6093/03 Pure Biology Practical Megathread : r/SGExams Create precise data tables with correct SI units

When they plotted their results on a graph, they saw a positive correlation between light intensity and the rate of photosynthesis. However, they also noticed that at very high light intensities, the rate of photosynthesis seemed to level off.

Before we dive into answers, it's crucial to understand the structure of the practical exams. The Cambridge O Level Biology (5090) syllabus includes two distinct practical components: | pH | Color Change | Amylase Activity

: When recording a semi-quantitative Benedict's test in a table, students were required to display specific headings and clear trends: Sample Identification Time Taken for Color Change (s) Final Color Observed Estimated Glucose Concentration ( g/dm3g/dm cubed Sample B (Highest Glucose) Shortest time (e.g., 26s) Brick-Red precipitate High (e.g., 0.95) Sample D (Negative Control) >120is greater than 120 Clear Blue solution

The drawing must accurately reflect the proportions of the actual specimen.

Disclaimer: The answers provided here are based on general pedagogical reviews of the 2020 Cambridge O Level Biology practical papers and should be used as a study guide.