Summary

• Description:

  The PDF document comprises Mirror Jet 2024 Biology Paper 1 Exam with Answers and Marking Scheme. The marking scheme is in a different document.

  It was a KCSE Biology (Theory) Paper 1 (231/1) examination administered during the Mirror Jet Exams Term Two 2024 series.

  • Duration: 2 Hours
  • Total Marks: 80
  • Number of Questions: 25 (Questions 1–25)

  The paper consisted of structured short-answer questions that assessed a wide range of Biology topics across human physiology, plant physiology, ecology, genetics, and practical biology.

  It covered the following topics:

  • Blood circulation and differences between arteries and veins
  • Human reproduction and hormonal control during pregnancy
  • Human musculoskeletal system and movement of the arm
  • Bioaccumulation of pollutants in food chains
  • Plant adaptations to environmental conditions such as drooping of leaves
  • Nitrogen cycle and nitrogen fixation by bacteria
  • Apical dominance and plant growth regulation
  • Trophic levels and parasitic relationships in ecosystems
  • Enzyme activity during seed germination and starch digestion
  • Respiration experiments using yeast and glucose
  • Enzyme activity in liver tissue involving hydrogen peroxide decomposition
  • Pollination mechanisms and adaptations of flowers
  • Seed viability and factors affecting germination
  • Classification of arthropods using morphological features
  • Causes of mutation and concepts of hybrid vigour and polyploidy
  • Evolution and adaptive radiation in insects
  • Human eye defects and their correction
  • Parts and functions of a light microscope
  • Plant cell turgidity and the role of osmosis
  • Cell division including interphase and meiosis
  • Gaseous exchange structures in insects
  • Digestion of carbohydrates in the human alimentary canal
  • Functions of reproductive structures such as placenta and amniotic fluid
  • Structure and function of the mammalian nephron
  • Genetics experiments involving inheritance in fruit flies (Drosophila melanogaster)
• Category:

  Mock Past Papers
• Level:

  Form 4
• Subject:

  BIOLOGY

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