O Level Biology Practical 2020 Answers File

Review: O Level Biology Practical 2020 – An Analysis of Answers and Exam Trends

Exam Session: October/November 2020 (Paper 5090/6 or Equivalent variants) Difficulty Rating: Moderate to Challenging

• The seedlings in the light condition grew faster and longer than those in the dark condition.
• This is because light is essential for photosynthesis, which provides energy for growth and development.
• In the absence of light, seedlings undergo etiolated growth, characterized by weak and spindly stems.

Observation: Higher temperatures lead to more red pigment leaking out, as high heat damages the cell membranes (denaturing proteins), making them more permeable. Photosynthesis (Variegated Leaves): o level biology practical 2020 answers

Scientific Naming: When identifying specimens, always underline the Genus and species names separately. Review: O Level Biology Practical 2020 – An

• Read axes and units carefully.
• Identify independent (time, concentration, temperature) and dependent variables.
• Keep other variables constant.
• For rates: calculate change per unit time (Δy/Δt). Use early linear portion if curve flattens.