Summary

• Description:

  The PDF document comprises ACK Joint Examination Biology Paper 1 2026 Pre-Mock Exam with Marking Scheme. The marking scheme is in a different document.

  It was an ACK Joint Evaluation Biology Paper 1 examination assessing core theoretical principles across human physiology, genetics, ecology, cell biology, and evolutionary dynamics. Accessing this pre-mock PDF download enables Form 4 candidates to master high-yield KCSE Biology concepts.

  • Month Administered: July 2026
  • Duration: 2 Hours
  • Total Marks: 80 Marks
  • Number of Questions: 27 Questions

  It covers the following topics:

  • Cell Biology & Physiology
    • Organelle functions (mitochondria, Golgi apparatus) and phagocytosis in white blood cells
    • Role of osmosis in biological systems
    • Endocrine control (aldosterone, insulin) and target organs
    • Anaerobic respiration in animals, lactic acid accumulation, and Respiratory Quotient (RQ) calculations
    • Phototropic light stage products and role of light in photosynthesis
  • Genetics & Reproduction
    • Nucleic acid identification (DNA vs. RNA) and complementary base pairing
    • Definition of mutagens and genetic crosses for Rhesus blood group factor
    • Importance of mitosis in living organisms
    • Functions of Sertoli cells, interstitial cells, and guard cells
    • Floral adaptations for wind pollination
    • Seed germination inhibition factors at temperature extremes
  • Human Health & Disease
    • Blood clotting cascade mechanism (thromboplastin, thrombin, fibrinogen)
    • Vascular disorders (varicose veins) and neonatal disorders (erythroblastosis fetalis)
    • Visual defects (myopia) and corrective lens solutions
    • Waterborne disease pathogens (cholera, typhoid, amoebic dysentery)
  • Ecology & Evolution
    • Nitrogen cycle pathways and atmospheric fixation methods
    • Population estimation using mark-recapture (Lincoln Index) methodology
    • Arthropod exoskeleton structure and protective functions
    • Mammalian respiratory mechanism models (bell jar apparatus)
    • Homologous structures, divergent evolution, and adaptive radiation
    • Fruit morphology, pericarp structure, and placentation types
• Length:

  12 pages
• Category:

  Mock Past Papers
• Level:

  Form 4
• Subject:

  BIOLOGY

Enter your details below to initiate a payment using MPESA.