Summary

• Description:

  The PDF document comprises KALA Joint Trials Biology Paper 3 2025 Mock Exam with Marking Scheme.

  It is a KCSE Biology Paper 3 (231/3) trial examination (July 2025).

  • Duration: 1 Hour 45 Minutes
  • Total Marks: 40
  • Number of Questions: 3 (Questions 1–3)
  • Marking Scheme: The marking scheme is in a different document.

  It covers the following topics:

  • Biological classification using plant specimens (constructing a dichotomous key using leaf venation, leaf margin, and leaf colour)
  • Flower and plant specimen observation (identifying class, giving reasons, and determining the likely agent of pollination)
  • Plant transport/physiology practical (stem cut-and-press procedure: observations and explanations)
  • Food tests (iodine test for starch and Benedict’s test for reducing sugars) on provided liquids
  • Membrane transport using visking tubing (diffusion/osmosis investigation and interpretation of results before and after immersion)
  • Roles of the physiological process investigated (applications in animals)
  • Mammalian skeleton identification from photographs (naming specimens and giving reasons)
  • Joints and skeletal structures (identifying labelled parts, naming joint types, and stating functions)
  • Vertebral column structure (function of cartilage between vertebrae)
• Category:

  Mock Past Papers
• Level:

  Form 4
• Subject:

  BIOLOGY

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