Summary

• Description:

  The MS Word document comprises AIC CHAMPION JOINT Biology Paper 1 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 231/1 examination.

  This revision paper provides a comprehensive assessment of foundational biological principles, physiological mechanisms, cellular ultrastructure, genetics, and ecology designed to benchmark learner KCSE preparedness.

  • Month Administered: July 2026
  • Duration: 2 Hours
  • Total Marks: 80
  • Number of Questions: 32 (Questions 1–32)
  • Structure: Compulsory short-answer questions covering the breadth of the secondary biology syllabus.

  It covers the following topics:

  • Plant physiology: end-products of the dark stage of photosynthesis and gaseous exchange sites
  • Circulatory systems: necessity of internal transport in higher animals
  • Excretion and osmoregulation: thermoregulation, urinary output, and freshwater fish excretion
  • Ecology: biomass determinations, inter- and intra-specific competition, and biomagnification of metallic pollutants
  • Reproduction in plants: fruit and seed dispersal adaptations
  • Human physiology: hepatic functions in lipid digestion and gastric cardiac sphincter role
  • Cytology: ultrastructure and functions of the mitochondrion and tissue staining techniques
  • Plant anatomy and transport: adaptations of xylem vessels to water conduction
  • Cell division: stages, features of meiosis, and chiasmata formation
  • Genetics: mutagenic agents, sex-linked genes, and traits on human X and Y chromosomes
  • Taxonomy and classification: binomial nomenclature rules for Musca domestica
  • Enzymology: mechanism of non-competitive inhibitors
  • Nutrition: vitamin deficiencies and dental disorders
  • Respiratory systems: counter-current flow in fish and adaptations of insect tracheoles
  • Nervous coordination: structure, adaptations, and impulse transmission in motor neurons
  • Plant responses: thigmotropism/haptotropism in climbing tendrils
  • Water relations: behaviour of Amoeba and parenchyma cells in hypotonic solutions
  • Thermoregulation: hypothalamic temperature detection and physiological responses to cold
  • Transpiration: effects of stomatal morphology and light intensity
  • Physiological transport: cellular processes dependent on simple diffusion
  • Locomotion: structure of synovial joints, ligaments, and patella mechanics
  • Reception: anatomy and function of ear ossicles, cochlea, and semicircular canals
  • Endocrinology: role of luteinizing hormone in male reproduction
  • Growth and development: discontinuous growth curves and ecdysis in insects
  • Evolution: nature and significance of fossil records
• File Size:

  200.04 KB
• Length:

  8 pages
• Category:

  Mock Past Papers
• Level:

  Form 4
• Subject:

  Biology
• Posted By:

  Caleb_Peter

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