O Level Biology Practical 2020 Answers ~upd~ -

If the experiment involved sugar/salt solutions, students needed to explain that water moved out of the tissue via osmosis because the external solution had a lower water potential, rendering the tissue flaccid.

Provide a of how to draw a perfect biological leaf cross-section.

You are required to record the colour of the three banana slices at 5, 10, and 20 minutes. The mark scheme is very specific about what constitutes an acceptable colour description. o level biology practical 2020 answers

Expected Observations : A color change from yellowish-brown to blue-black indicates the presence of starch. Experiment B: Enzyme Catalysis (Amylase or Catalase)

: Amylase breaking down starch into maltose over time, measured at fixed intervals (e.g., every 30 seconds) using a spotting tile filled with iodine drops. Data Analysis & Answers : The mark scheme is very specific about what

Actual size must be in same unit as drawing. Convert 0.05 mm = 50 µm? Not needed if both in mm.

The official 2020 mark schemes are more than just answer keys; they are a roadmap to exam success. Here’s how to use them effectively: Data Analysis & Answers : Actual size must

For enzyme experiments (like catalase), repeating the experiment is essential to ensure the reliability of the results. Variation:

Any valid factor that could affect growth, other than light, is acceptable. This tests your understanding of a fair test.