Summary

• Description:

  The MS Word document comprises the "BIOLOGY FORM 4 TERM 2 2025 MID TERM 2 EXAMINATION". The PDF version is also available upon your request.

  Please note that the marking scheme is in a different document.

  The exam paper requires candidates to answer all questions in the spaces provided. It consists of 18 questions.

  The exam is marked out of a total of 50 marks.

  The time allocated for this examination is 1 hour and 15 minutes.

  The topics covered in this exam include:

  • Enzymes: Effect of pH on enzyme activity, factors affecting enzyme activity.
  • Respiration: Energy requirements in different animals, conditions for lactic acid formation in human muscles.
  • Biological Study Tools: Identification and use of apparatus for collecting specimens (e.g., Pooter).
  • Evolution: Limitations of fossil records, analogous structures, comparative embryology as evidence of organic evolution, vestigial structures, types of evolution illustrated by specific examples (e.g., hind limbs of birds, wings of birds and insects), advantages of natural selection.
  • Cell Division: Mitosis in animal cells (consequences of chromatids failing to separate), regions in plants where cells actively undergo mitosis.
  • Nucleic Acids: Identification of nucleic acid types (e.g., based on constituent bases like Thymine).
  • Ecology: Reasons for the decrease in biomass at successively higher trophic levels, the role of bacteria (Nitrosomonas, Nitrobacter) in the nitrogen cycle.
  • Genetics:
    • Inheritance patterns (e.g., "windows peak" trait).
    • Definition of alleles.
    • Definition of vestigial structures.
    • Definition and examples of sex-linkage.
    • Stating the first law of inheritance (Mendel's first law).
    • Types of variation (e.g., human blood groups A, B, AB, O).
    • Disorders in humans caused by gene mutation.
  • Reproduction: Definition of parthenogenesis.
  • Biotechnology/Applied Genetics: Definitions of genetic engineering, gene mapping, heterosis, and gene sequencing.
  • Comparative Physiology: Reasons for higher activity levels in birds and mammals related to their circulatory systems.
  • Adaptation: Evolutionary processes leading to similar structures in different organisms adapted to similar environments (e.g., paddles of whales and fins of fish).
• Category:

  Exams
• Level:

  Form 4
• Subject:

  BIOLOGY

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