GROWTH AND DEVELOPMENT

Introduction and Definitions

By the end of the lesson, the learner should be able to:
To distinguish between growth and development. To define growth as permanent increase in size and weight. To explain development as structural changes and differentiation. To relate growth to cell division and tissue formation.

In groups, learners are guided to:
Q/A: Review reproduction concepts. Discussion: Definition of growth vs development. Teacher exposition: Cell division, differentiation and tissue formation. Q/A: Examples of growth and development in organisms. Discussion: Growth as characteristic of living organisms.

Charts showing growth and development, Textbook, Wall charts

Certificate Biology Form 3, Pages 178-179

GROWTH AND DEVELOPMENT

Measurement of Growth
Patterns and Rate of Growth
Factors Controlling Plant Growth
Stages of Growth and Life Cycle

By the end of the lesson, the learner should be able to:
To identify different methods of measuring growth. To explain linear dimensions, mass and dry weight measurements. To describe advantages and limitations of each method. To calculate growth rates.

In groups, learners are guided to:
Discussion: Methods of measuring growth in plants and animals. Teacher exposition: Linear measurements, mass, dry weight procedures. Practical demonstration: Measuring techniques. Q/A: Why dry weight is more accurate for plants. Calculate growth rate examples.

Measuring instruments, Scales, Rulers, Calculators, Sample plants
Growth curve charts, Graph paper, Calculators, Sample data sets
Environmental factor charts, Temperature scales, Light meters if available, Textbook
Plant life cycle charts, Examples of annual and perennial plants, Textbook

Certificate Biology Form 3, Pages 178-179

GROWTH AND DEVELOPMENT

Seed Structure - Monocots and Dicots
Conditions for Germination
Types of Germination
Germination Practical Investigation
Primary Growth and Meristems

By the end of the lesson, the learner should be able to:
To examine and draw structure of monocot and dicot seeds. To identify parts of bean and maize seeds. To compare structural differences between seed types. To explain functions of seed parts.
To set up germination experiments for different seed types. To observe daily changes in germinating seeds. To record measurements and growth data. To compare germination patterns.

In groups, learners are guided to:
Practical examination: Soaked bean and maize seeds. Dissection and identification of seed parts. Drawing and labeling: Bean seed cotyledons, embryo, testa. Drawing maize grain: endosperm, scutellum, plumule, radicle. Comparison table of monocot vs dicot seeds.
Practical work: Setting up germination experiments with bean and maize seeds. Daily observations and measurements of seedling growth. Recording data: root length, shoot height, leaf development. Drawing stages of germination over time. Data collection for growth rate calculations.

Soaked bean and maize seeds, Hand lens, Scalpels, Drawing materials, Iodine solution
Germination apparatus, Seeds at different stages, Temperature monitoring equipment, Textbook
Germinating seeds at various stages, Drawing materials, Observation trays, Hand lens
Seeds, Petri dishes, Cotton wool, Measuring rulers, Data recording sheets, Clay pots
Meristem distribution charts, Drawing materials, Microscope slides of meristems, Textbook

Certificate Biology Form 3, Pages 182-183
Certificate Biology Form 3, Pages 200-201

GROWTH AND DEVELOPMENT

Secondary Growth and Cambium Activity
Annual Rings and Plant Dormancy

By the end of the lesson, the learner should be able to:
To describe secondary growth in dicots. To explain vascular cambium and cork cambium functions. To identify secondary xylem and phloem formation. To relate secondary growth to plant strength and support.

In groups, learners are guided to:
Detailed discussion: Secondary thickening in woody plants. Teacher exposition: Vascular cambium tangential divisions. Q/A: Secondary xylem and phloem development. Discussion: Cork cambium, lenticels and bark formation. Drawing cross-sections showing secondary tissues.

Secondary growth diagrams, Tree trunk sections, Drawing materials, Hand lens
Tree trunk cross-sections, Dormant plant organs, Charts, Textbook

Certificate Biology Form 3, Pages 186-188

GROWTH AND DEVELOPMENT

Seed Dormancy and Breaking Mechanisms

By the end of the lesson, the learner should be able to:
To describe seed dormancy characteristics. To explain factors that break seed dormancy. To identify vernalization, moisture, light and chemical effects. To discuss advantages of seed dormancy.

In groups, learners are guided to:
Detailed discussion: Dormant seed characteristics and low metabolic activity. Teacher exposition: Vernalization, moisture, light requirements. Q/A: Chemical inhibitors and gibberellic acid effects. Discussion: Dormancy advantages - dispersal time, favorable conditions.

Dormant seeds, Germination comparison setups, Chemical solutions, Textbook

Certificate Biology Form 3, Pages 188-189

GROWTH AND DEVELOPMENT

Plant Growth Substances - Auxins
Gibberellins, Cytokinins and Other Hormones

By the end of the lesson, the learner should be able to:
To describe discovery of plant hormones by Fritz Went. To explain auxin functions in stems, leaves, roots and fruits. To identify IAA structure and translocation. To discuss practical applications of auxins.

In groups, learners are guided to:
Teacher exposition: Went's experiments with oat coleoptiles and auxin discovery. Discussion: Auxin effects in different plant organs. Q/A: Apical dominance and parthenocarpy. Practical applications: rooting powders, herbicides, fruit development.

Auxin experiment diagrams, Plant cuttings, Rooting powder demonstration, Textbook
Plant hormone effect charts, Ripening fruits, Textbook

Certificate Biology Form 3, Pages 189-192

GROWTH AND DEVELOPMENT

Practical Applications of Plant Hormones
Animal Growth Patterns and Life Cycles
Complete Metamorphosis

By the end of the lesson, the learner should be able to:
To explain commercial uses of plant hormones. To describe hormone applications in agriculture and horticulture. To identify hormone uses in crop production. To discuss economic benefits of hormone applications.
To describe complete metamorphosis stages. To explain life cycle of housefly and butterfly. To identify egg, larva, pupa and adult stages. To discuss economic importance of insects with complete metamorphosis.

In groups, learners are guided to:
Discussion: Commercial applications of auxins in propagation. Teacher exposition: Gibberellins in brewing and dwarf plant treatment. Q/A: Hormone use in fruit production and weed control. Case studies: Economic benefits in agriculture and horticulture.
Detailed study: Housefly life cycle - egg, maggot, pupa, imago. Teacher exposition: Butterfly development - caterpillar, chrysalis, adult. Q/A: Structural and behavioral differences between stages. Discussion: Economic importance - pests, silk production.

Hormone application examples, Agricultural product samples, Case study materials
Growth curve charts, Animal development examples, Graph paper, Textbook
Insect life cycle charts, Preserved specimens if available, Drawings, Textbook

Certificate Biology Form 3, Pages 191-194
Certificate Biology Form 3, Pages 195-198

GROWTH AND DEVELOPMENT

Incomplete Metamorphosis
Hormonal Control of Growth in Animals

By the end of the lesson, the learner should be able to:
To describe incomplete metamorphosis characteristics. To explain life cycles of cockroach and locust. To identify nymphal stages and molting process. To compare complete and incomplete metamorphosis.

In groups, learners are guided to:
Discussion: Egg to adult development through nymphal stages. Teacher exposition: Cockroach and locust life cycles. Q/A: Molting/ecdysis process and wing development. Comparison table: Complete vs incomplete metamorphosis.

Incomplete metamorphosis charts, Grasshopper specimens, Comparison tables, Textbook
Hormone control charts, Animal development diagrams, Textbook

Certificate Biology Form 3, Pages 198-199

GROWTH AND DEVELOPMENT
GENETICS
GENETICS

Growth Measurement Practical
Introduction to Genetics and Variation
Observable Variations in Human Beings

By the end of the lesson, the learner should be able to:
To measure plant growth over time. To record linear measurements and calculate growth rates. To plot growth curves from collected data. To analyze factors affecting growth differences.

In groups, learners are guided to:
Practical work: Long-term measurement of plant growth (height, leaf length). Data recording: Daily/weekly measurements over extended period. Mathematical analysis: Growth rate calculations. Graph plotting: Growth curves and growth rate curves.

Growing plants, Measuring rulers, Data recording sheets, Graph paper, Calculators
Textbook, chalkboard, chalk
Ink pad, plain paper, metre rule, exercise books

Certificate Biology Form 3, Pages 201-202

GENETICS

Discontinuous and Continuous Variation
Causes of Variation
Chromosome Structure

By the end of the lesson, the learner should be able to:
Define discontinuous and continuous variation. Give examples of each type. Plot frequency distribution graphs for continuous variation.

In groups, learners are guided to:
Analysis of tongue rolling and height data. Plotting frequency-height graphs on chalkboard. Discussion on differences between variation types.

Graph paper, rulers, height data from previous lesson, textbook
Textbook, chalkboard, chalk
Textbook, chalkboard, chalk, exercise books, pencils

KLB Secondary Biology Form 4, Pages 3-4

GENETICS

Chromosome Behaviour During Mitosis
Chromosome Behaviour During Meiosis
DNA Structure and Replication
DNA and Protein Synthesis
Mendel's Experiments and First Law

By the end of the lesson, the learner should be able to:
Demonstrate chromosome behaviour during mitosis. Identify stages of mitosis. Explain importance of mitosis.
Explain role of DNA in protein synthesis. Describe mRNA formation and function. Understand genetic code concept.

In groups, learners are guided to:
Practical activity using colored threads to model mitosis stages. Creating paper models of mitotic stages. Group discussions.
Exposition on transcription and translation. Discussion on messenger RNA. Examples of genetic codes using chalkboard diagrams.

Colored threads (6cm and 3cm), scissors, manila paper, string for tying knots
Colored threads, manila paper, textbook
Textbook, chalkboard, chalk, exercise books

KLB Secondary Biology Form 4, Pages 6-8
KLB Secondary Biology Form 4, Pages 12-13

GENETICS

Monohybrid Inheritance Concepts
Genetic Crosses and Punnet Squares

By the end of the lesson, the learner should be able to:
Define monohybrid inheritance, genotype, phenotype. Distinguish between dominant and recessive genes. Explain homozygous and heterozygous conditions.

In groups, learners are guided to:
Exposition on genetic terminology. Practice using genetic symbols on chalkboard. Discussion on gene expression patterns.

Textbook, chalkboard, chalk, exercise books
Textbook, chalkboard, chalk, exercise books, pencils

KLB Secondary Biology Form 4, Pages 15-17

GENETICS

Probability in Inheritance
Modeling Random Gamete Fusion

By the end of the lesson, the learner should be able to:
Explain probability in genetic inheritance. Calculate phenotypic and genotypic ratios. Demonstrate random events using coin tossing.

In groups, learners are guided to:
Mathematical analysis of genetic ratios. Coin tossing experiment to demonstrate probability. Statistical interpretation of results.

Coins, exercise books for recording, calculators (if available), textbook
Different colored beans (or maize grains), small containers, exercise books

KLB Secondary Biology Form 4, Pages 18-19

GENETICS

Complete Dominance Problems

By the end of the lesson, the learner should be able to:
Solve genetic problems involving complete dominance. Analyze inheritance patterns in garden peas. Practice genetic calculations.

In groups, learners are guided to:
Worked examples of genetic problems on chalkboard. Practice sessions with various characteristics. Group problem-solving.

Textbook, chalkboard, chalk, exercise books

KLB Secondary Biology Form 4, Pages 20-21

GENETICS

Incomplete Dominance
ABO Blood Group System
Rhesus Factor and Unknown Genotypes
Sex Determination

By the end of the lesson, the learner should be able to:
Define incomplete dominance. Analyze inheritance in four o'clock plants. Compare with complete dominance patterns. Draw genetic crosses showing blending.
Describe Rhesus factor genetics. Explain test cross and back cross methods. Use selfing to determine genotypes.

In groups, learners are guided to:
Exposition on incomplete dominance using chalkboard diagrams. Genetic crosses showing blending inheritance. Practice problems with flower colors.
Exposition on Rh factor inheritance using chalkboard. Demonstration of test cross technique. Practice problems on genotype determination.

Textbook, chalkboard, chalk, colored chalk (if available)
Textbook, chalkboard, chalk, exercise books
Textbook, chalkboard, chalk, exercise books
Textbook, chalkboard, chalk

KLB Secondary Biology Form 4, Pages 22-24
KLB Secondary Biology Form 4, Pages 25-26

GENETICS

Gene Linkage

By the end of the lesson, the learner should be able to:
Define gene linkage and linkage groups. Explain inheritance of linked genes. Understand why some genes are inherited together.

In groups, learners are guided to:
Exposition on linked genes using simple diagrams. Examples from fruit fly genetics drawn on chalkboard. Discussion on chromosome maps.

Textbook, chalkboard, chalk

KLB Secondary Biology Form 4, Pages 27-28

GENETICS

Sex-linked Inheritance - Color Blindness
Sex-linked Inheritance - Haemophilia

By the end of the lesson, the learner should be able to:
Describe sex-linked inheritance patterns. Explain color blindness inheritance. Construct and analyze pedigree charts.

In groups, learners are guided to:
Detailed exposition on X-linked inheritance using chalkboard. Genetic crosses for color blindness. Drawing simple pedigree charts.

Textbook, chalkboard, chalk, exercise books, rulers
Textbook, chalkboard, chalk, exercise books

KLB Secondary Biology Form 4, Pages 28-30

GENETICS

Crossing Over and Recombination
Chromosomal Mutations - Non-disjunction

By the end of the lesson, the learner should be able to:
Explain crossing over during meiosis. Understand how crossing over affects linkage. Describe formation of new gene combinations.

In groups, learners are guided to:
Detailed explanation of crossing over using simple diagrams. Examples of recombinant offspring drawn on chalkboard. Discussion on genetic variation.

Textbook, chalkboard, chalk, colored chalk
Textbook, chalkboard, chalk, exercise books

KLB Secondary Biology Form 4, Page 31

GENETICS

Chromosomal Mutations - Polyploidy
Gene Mutations
Genetic Disorders - Albinism

By the end of the lesson, the learner should be able to:
Describe structural chromosome changes. Explain polyploidy in plants. Understand chromosome number variations.
Define gene mutations. Describe insertion, deletion, substitution and inversion. Explain effects on protein synthesis using analogies.

In groups, learners are guided to:
Exposition on chromosome number changes. Examples of polyploidy in agriculture using chalkboard. Discussion on plant breeding applications.
Detailed exposition on point mutations using simple examples. Use SMS text analogies for mutations. Discussion on protein changes.

Textbook, chalkboard, chalk
Textbook, chalkboard, chalk, simple text examples
Textbook, chalkboard, chalk, exercise books

KLB Secondary Biology Form 4, Pages 35-36
KLB Secondary Biology Form 4, Pages 36-38

GENETICS

Genetic Disorders - Sickle Cell Anaemia
Environmental Effects on Gene Expression
Applications of Genetics

By the end of the lesson, the learner should be able to:
Describe sickle cell anaemia inheritance. Explain hemoglobin differences. Understand sickle cell trait vs disease.

In groups, learners are guided to:
Exposition on sickle cell genetics using diagrams. Comparison of normal and sickle cell hemoglobin. Genetic crosses and probabilities.

Textbook, chalkboard, chalk
Textbook, local plant examples, chalkboard
Textbook, local breeding examples, chalkboard

KLB Secondary Biology Form 4, Pages 40-42