Summary

• Description:

  The PDF document comprises a complete set of Form 3 Biology Notes, covering all major topics for the year.

  The topics and sub-topics covered in the document include:

  1. Classification II

  • Principles: Builds on classification principles, emphasizing structure, function, genetics, and biochemistry.

  • Binomial Nomenclature: Explains the two-part naming system devised by Carolus Linnaeus, including rules for writing the genus and species names.

  • The Five Kingdoms: Provides a detailed comparison of Kingdoms Monera, Protoctista, Fungi, Plantae, and Animalia. It delves into the general characteristics and economic importance (both beneficial and harmful) of each kingdom.

  • Kingdom Plantae: Breaks down the kingdom into divisions Bryophyta (mosses) and Pteridophyta (ferns), and Spermatophyta (seed-bearing plants), further dividing the latter into Gymnosperms and Angiosperms (Monocotyledonae and Dicotyledonae).

  • Kingdom Animalia: Focuses on Phylum Arthropoda (detailing classes Crustacea, Arachnida, Chilopoda, Diplopoda, and Insecta) and Phylum Chordata (detailing classes Pisces, Amphibia, Reptilia, Aves, and Mammalia).

  • Dichotomous Keys: Explains how to construct and use these tools for identifying unknown organisms based on observable characteristics.

  2. Ecology

  • Introduction: Defines key ecological concepts like habitat, niche, population, community, and ecosystem.

  • Ecosystem Factors: Discusses abiotic (non-living) factors like temperature and light, and biotic (living) factors like competition and predation.

  • Energy Flow: Explains trophic levels, food chains, and food webs, illustrating the flow of energy from producers to consumers.

  • Population Estimation: Details methods for estimating population size, including the quadrat method, line and belt transects, and the capture-recapture method.

  • Adaptations: Describes how plants adapt to various habitats (Xerophytes, Mesophytes, Hydrophytes, and Halophytes).

  • Pollution and Human Diseases: Covers the sources and effects of air, water, and soil pollution, as well as common human diseases caused by bacteria, protozoa, and other parasites.

  3. Reproduction in Plants and Animals

  • Cell Division: Explains the processes and significance of Mitosis (for growth and repair) and Meiosis (for gamete formation).

  • Asexual Reproduction: Covers methods like binary fission in Amoeba, spore formation in Rhizopus, and budding in yeast.

  • Sexual Reproduction in Plants: Details the structure of a flower, pollination, fertilization, and the development of fruits and seeds.

  • Sexual Reproduction in Humans: Describes the male and female reproductive systems, fertilization, implantation, the role of the placenta, and the menstrual cycle, regulated by hormones.

  4. Growth and Development

  • Concepts: Differentiates between growth (permanent increase in size) and development (increase in complexity).

  • Growth Curves: Explains the sigmoid (S-shaped) growth curve and its phases (lag, exponential, decelerating, plateau) as well as the intermittent growth curve seen in arthropods.

  • In Plants: Covers seed structure, dormancy, conditions for germination (epigeal and hypogeal), and the difference between primary and secondary growth. The role of growth hormones like auxins and gibberellins is also discussed.

  • In Animals: Focuses on insect development, explaining the difference between complete metamorphosis (egg-larva-pupa-adult) and incomplete metamorphosis (egg-nymph-adult).

  These notes offer a complete and thorough guide to the Form 3 Biology syllabus. They are well-structured, neat, and printable, with clear explanations and diagrams. This makes them an excellent resource for students for their year-long study and KCSE revision, as well as for teachers seeking comprehensive material for lesson preparation.

• Length:

  76 pages
• Category:

  Lesson Notes
• Level:

  Form 3
• Subject:

  BIOLOGY
• Posted By:

  amingaskykrapper

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