O Level Biology Practical 2020 Answers [updated]

The Investigation of Photosynthesis in Elodea Plants

Model Q&A: Typical 2020 practical with worked answers

Scenario (typical): "A student measures the rate of fermentation in yeast by measuring CO2 volume produced every 2 minutes at 30°C. Data: 0 min—0 cm3; 2 min—12 cm3; 4 min—22 cm3; 6 min—28 cm3; 8 min—32 cm3; 10 min—34 cm3." o level biology practical 2020 answers

Answer: To prevent air bubbles from entering the xylem vessels, which would block water movement. The Investigation of Photosynthesis in Elodea Plants Model

High temperature breaks hydrogen bonds in the enzyme’s tertiary structure, altering the active site so substrate cannot bind (denaturation). Drawing Precision : Always use a sharp HB

Drawing Precision: Always use a sharp HB pencil for diagrams. Ensure the drawing occupies at least two-thirds of the provided space and is titled correctly (e.g., "Transverse Section of lime fruit").