Summary

• Description:

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

  It was a CEKENAS Form 4 Biology Paper 1 theory examination testing broad biological concepts including cell physiology, genetics, ecology, and anatomy. Excellent for KCSE revision, this document provides comprehensive exam practice for students and teachers in PDF download format with marking scheme support.

  • Month Administered: March/April 2026
  • Duration: 2 Hours
  • Total Marks: 80 Marks
  • Number of Questions: 30 (Questions 1–30)
  • Structure: Single compulsory theory section containing 30 short-answer and structured questions.

  It covers the following topics:

  • Characteristics of living things and arthropod taxonomy
  • Cell organelle functions (Nuclear membrane and centrioles)
  • Ecology (Ecological niche vs. habitat, aquatic food webs, ecosystem roles, synthetic pesticide hazards)
  • Human health and pathology (Tuberculosis and Syphilis causative agents)
  • Plant reproduction and growth (Pollen tube growth, double fertilization, apical dominance in agriculture)
  • Biochemistry and structural carbohydrates (Chitin, cellulose, and enzyme denaturisation)
  • Evolutionary biology (Geographical isolation and speciation, vestigial structures, divergent evolution)
  • Plant anatomy (Transverse section of dicotyledonous stem)
  • Cellular respiration (Aerobic vs. anaerobic efficiency)
  • Hematology and cardiovascular system (Blood clotting mechanisms)
  • Genetics and molecular biology (RNA structure and gene mutations)
  • Plant water relations and osmosis (Potato cylinder experiment)
  • Insect respiratory physiology (Cockroach tracheal system)
  • Animal dentition and digestive adaptations (Carnivore dentition)
  • Cytology and cell division (Meiotic stages and crossing over at chiasmata)
  • Excretion and osmoregulation (Kidney structural adaptations in diverse habitats)
• File Size:

  1.13 MB
• Length:

  12 pages
• Category:

  Mock Past Papers
• Level:

  Form 4
• Subject:

  BIOLOGY
• Posted By:

  Caleb_Peter

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