O Level Biology Practical 2020 Answers [2021] | 2025-2026 |

| 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 |

Answer: Elodea plants are used as a model organism to investigate photosynthesis. They produce oxygen as a byproduct of photosynthesis, which can be measured and used to estimate the rate of photosynthesis. o level biology practical 2020 answers

: Higher temperatures damage cell membranes more extensively, leading to a darker red solution as more pigment leaks out. General Practical Guidelines | pH | Color Change | Amylase Activity

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