Summary

• Description:

  The MS Word document comprises CROSS COUNTY 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 Paper 1 examination.

  This paper is designed to test core theoretical principles, biological terminology, physiological processes, and scientific interpretations across the secondary biology syllabus. It provides an assessment of cellular biology, physiology in plants and animals, genetics, ecology, and anatomy.

  • Month Administered: April/May 2026
  • Duration: 2 Hours
  • Total Marks: 80
  • Number of Questions: 27 (Questions 1 - 27)
  • Structure: Single-section compulsory paper consisting of 27 structured, short-answer questions.

  It covers the following topics:

  • Cell biology: active transport, cell organelles (centrioles, contractile vacuoles, mitochondria, Golgi apparatus), enzyme co-factors, and water relations (osmosis, plasmolysis, and turgidity in plant cells)
  • Plant reproduction and development: floral morphology (hypogynous and pistillate flowers), seed germination, role of water, and dry mass fluctuations in cotyledons
  • Organic evolution: homologous versus analogous structures and comparative anatomy
  • Parasitology and disease control: protozoan infection preventive measures in humans
  • Taxonomy and classification: diagnostic characteristics separating Chilopoda, Diplopoda, Insecta, and Arachnida
  • Microscopy: resolving power versus magnification
  • Circulatory systems: major mammalian blood vessels (pulmonary artery, hepatic portal vein)
  • Gaseous exchange: insect tracheole system adaptations and leaf structural modifications
  • Plant nutrition: light and dark reactions in photosynthesis
  • Homeostasis and endocrine regulation: functions of insulin and antidiuretic hormone (ADH), and mammalian thermoregulation
  • Human nutrition and digestion: lipid metabolism, adipose storage, and gut musculature
  • Plant anatomy: vascular cambium, secondary thickening, and transverse root structures
  • Locomotion and support: mammalian muscle tissue types
  • Genetics: chromosomal mutations and twinning mechanisms (monozygotic vs. dizygotic)
  • Ecology: environmental pollution, sewage contamination, and aquatic bacterial dynamics
  • Respiration: anaerobic respiration pathways in plants and respiratory adaptations in fish
• File Size:

  289.42 KB
• Length:

  9 pages
• Category:

  Mock Past Papers
• Level:

  Form 4
• Subject:

  Biology
• Posted By:

  Caleb_Peter

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