Summary

• Description:

  The MS Word document comprises CROSS COUNTY Biology Paper 3 2026 Mock Exam with Answers (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 examination.

  This practical examination tests candidates on laboratory experimental skills, biological drawings, macroscopic specimen observations, food tests, and physiological investigations. Candidates are evaluated on morphological classification, biochemical titration for vitamin content, and tissue osmoregulatory responses.

  • Duration: 1¾ Hours
  • Total Marks: 40
  • Number of Questions: 3 (Questions 1 - 3)
  • Structure: Practical laboratory examination comprising three compulsory investigative questions.

  It covers the following topics:

  • Arthropod biology and development: complete metamorphosis in Lepidoptera, life cycle stages (egg, larva, pupa, adult), hormonal regulation (ecdysone and juvenile hormone), and taxonomic classification of insects
  • Plant morphology: fruit and floral anatomy, plan drawings, biological labeling, and magnification calculation
  • Biochemical food tests: DCPIP quantitative test for ascorbic acid (vitamin C) content and heat denaturation effects
  • Seed dispersal ecology: fruit adaptations and dispersal agents
  • Plant water relations: experimental demonstration of osmosis, turgor pressure changes, strip curvature, and texture variation in hypertonic and hypotonic solutions
• File Size:

  680.49 KB
• Length:

  5 pages
• Category:

  Mock Past Papers
• Level:

  Form 4
• Subject:

  Biology
• Posted By:

  Caleb_Peter

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