O Level Biology Practical 2020 Answers _hot_ -

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: Candidates investigated the effect of temperature on the release of red pigment from beetroot tissue.

Candidates placed uniform strips of plant tissue (such as potato tubers or onion epidermis) into varied concentrations of sucrose or sodium chloride solutions.

Water moves from a higher water potential (inside the cell) to a lower water potential (outside) via partially permeable membranes. 3. General Tips for Answering Practical Papers o level biology practical 2020 answers

Print the question paper and set a timer:

High temperature breaks hydrogen bonds in the enzyme’s tertiary structure, altering the active site so substrate cannot bind (denaturation).

The drawing must occupy at least half to two-thirds of the space provided. It must accurately reflect the proportions of the original specimen. This public link is valid for 7 days

While the exact 2020 paper isn’t public, every O Level Biology practical reuses these skills. Download the – they are structurally identical to 2020.

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.

Identifying distinct color changes in biochemical tests. Can’t copy the link right now

This question focused on the breakdown of hydrogen peroxide ( H2O2cap H sub 2 cap O sub 2

Experiment A: Investigating Reducing Sugars and Starch (Food Tests)

Students were typically provided with a substrate (e.g., hydrogen peroxide or starch solution) and an enzyme source (e.g., yeast suspension or plant extract). Typical Experimental Setup