Summary

• Description:

  The PDF document comprises KALA Joint Trials 2024 Biology Paper 2 Exam with Answers and Marking Scheme. The marking scheme is in a different document.

  It was a KCSE Biology Paper 2 (231/2) Pre-Trial examination administered in July 2024.

  • Duration: 2 Hours
  • Total Marks: 80
  • Number of Questions: 8
  • Paper Structure: Two Sections – Section A (Questions 1–5) and Section B (Questions 6–8).

  The paper was structured as follows:

  • Section A (40 marks): Structured questions testing interpretation of experiments, biological concepts, calculations, and data analysis.
  • Section B (40 marks): Extended response questions where Question 6 was compulsory and candidates answered either Question 7 or Question 8.

  It covered the following topics:

  • Digestion of fats by enzymes and the role of lipase in lipid digestion
  • Enzyme activity and effects of temperature and pH in biochemical reactions
  • Absorption of products of fat digestion in the human digestive system
  • Osmotic potential and measurement of osmotic pressure
  • Osmosis experiments using carrot tissue in sugar solution
  • Physiological processes in plants including transpiration experiments
  • Experimental investigation of plant growth under different environmental conditions
  • Effects of light, temperature, and nutrients on plant growth
  • Genetics and inheritance patterns involving alleles determining feather colour in birds
  • Genetic crosses and phenotypic ratios in offspring
  • Advantages of using plants in genetics studies
  • Deamination of amino acids and nitrogenous waste excretion
  • Comparison of ammonia and urea excretion in frogs during development
  • Graph plotting and interpretation of biological data
  • Conversion of ammonia to urea in animal metabolism
  • Population regulation factors in ecosystems
  • Energy flow through trophic levels in food chains and food webs
  • Natural selection and evolution
  • Adaptation of organisms to their environment through natural selection
• Category:

  Mock Past Papers
• Level:

  Form 4
• Subject:

  BIOLOGY

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