Summary

• Description:

  The MS Word document comprises Bunaf Cluster Examination Biology Paper 3 (Practical) June 2026 Pre-Mock Exam with Marking Scheme. The PDF version is also available upon your request. The marking scheme is in a different document.

  It was a KCSE Biology Paper 3 (Practical) examination. This paper assesses Form 4 candidates' ability to conduct biological experiments, make and record accurate observations, draw scientific diagrams, and demonstrate understanding of osmosis, classification, and biological processes through practical work.

  • Month Administered: June 2026
  • Duration: 1¾ hours
  • Total Marks: 40
  • Number of Questions: 3 (all compulsory)
  • Structure:
    • Question 1 – 13 marks
    • Question 2 – 13 marks
    • Question 3 – 14 marks

  It covers the following topics:

  • Question 1 — Osmosis and Diffusion (Visking Tubing Experiment):
    • Transverse section of Specimen A (a fruit) — drawing and labelling
    • Identification of fruit type
    • Preparing an extract in visking tubing; immersion in iodine solution
    • Recording observations before and after the experiment
    • Explaining results in terms of selective permeability and osmosis/diffusion
  • Question 2 — Classification:
    • Identifying the class of a specimen from a photograph with observable reasons
  • Question 3 — Additional practical Biology tasks
• Category:

  Mock Past Papers
• Level:

  Form 4
• Subject:

  BIOLOGY

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