Summary

• Description:

  The PDF document comprises The Mirror Jet 2 Examinations Biology Paper 1 2025 Mock Exam with Marking Scheme.

  It is a KCSE Pre-Mock Examination 2025 Biology Paper 1 (231/1).

  • Duration: 2 Hours
  • Total Marks: 80
  • Number of Questions: 30 (Questions 1–30)
  • Marking Scheme: The marking scheme is in a different document.

  It covers the following topics:

  • Microscopy (functions of lenses and safety of electron microscopes)
  • Cell division and the effect of respiratory poisons
  • Parasitology (Schistosoma identification, disease, and adaptations)
  • Classification (constructing a dichotomous key for arthropods)
  • Human digestive system anatomy (Pyloric sphincter and Crypt of Lieberkuhn)
  • Photosynthesis (Light and Dark stages)
  • Circulatory system (structure and function of arteries)
  • Ecological study methods (apparatus and precautions)
  • Chromosomal mutations (extra sex chromosomes and characteristics)
  • Respiration substrates (glucose vs. sucrose utilization)
  • Structure and function of a synapse
  • Reproduction (comparison of bird and mammal eggs)
  • Causative agents of human diseases (Whooping cough and Gonorrhoea)
  • Gaseous exchange in insects (tracheal system)
  • Ecological niches and habitats
  • Blood composition (identification of cells and blood defects)
  • Insect metamorphosis and hormonal control
  • Plant responses (thigmotropism in Ipomea)
  • Reproduction in gymnosperms (male vs. female cones)
  • Diffusion and osmosis experiments (Visking tubing and potato cylinders)
  • Digestion (emulsification of fats)
  • Respiratory Quotient (RQ) calculations
  • Support and movement (vertebra identification and articulation)
  • Genetics (Mendel's first law and blood group antigens)
  • Stages of cell division (meiosis/mitosis diagrams)
  • Evolution (Lamarck's theory)
  • Transpiration and xylem structure
  • Hormonal control of lactation (milk secretion and let-down)
• Category:

  Mock Past Papers
• Level:

  Form 4
• Subject:

  BIOLOGY

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