GENETICS

Genetic Crosses and Punnet Squares

By the end of the lesson, the learner should be able to:
Draw genetic cross diagrams. Use punnet squares to show genetic crosses. Predict offspring genotypes and phenotypes.

Step-by-step construction of genetic crosses on chalkboard. Practice with punnet squares. Student exercises on genetic problems.

Textbook, chalkboard, chalk, exercise books, pencils

KLB Secondary Biology Form 4, Pages 17-18

GENETICS

Probability in Inheritance

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.

Mathematical analysis of genetic ratios. Coin tossing experiment to demonstrate probability. Statistical interpretation of results.

Coins, exercise books for recording, calculators (if available), textbook

KLB Secondary Biology Form 4, Pages 18-19

GENETICS

Modeling Random Gamete Fusion

By the end of the lesson, the learner should be able to:
Demonstrate random fusion of gametes. Use simple materials to model inheritance. Analyze experimental vs expected results.

Practical activity using different colored beans to represent gametes. Data collection and analysis. Discussion on sample size effects.

Different colored beans (or maize grains), small containers, exercise books

KLB Secondary Biology Form 4, Pages 19-20

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.

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

By the end of the lesson, the lear7ner should be able to:
Define incomplete dominance. Analyze inheritance in four o'clock plants. Compare with complete dominance patterns. Draw genetic crosses showing blending.

Exposition on incomplete dominance using chalkboard diagrams. Genetic crosses showing blending inheritance. Practice problems with flower colors.

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

KLB Secondary Biology Form 4, Pages 22-24

GENETICS

Incomplete Dominance
ABO Blood Group System

By the end of the lesson, the lear7ner should be able to:
Define incomplete dominance. Analyze inheritance in four o'clock plants. Compare with complete dominance patterns. Draw genetic crosses showing blending.

Exposition on incomplete dominance using chalkboard diagrams. Genetic crosses showing blending inheritance. Practice problems with flower colors.
Detailed explanation of blood group genetics on chalkboard. Genetic crosses involving blood group inheritance. Practice problems and paternity cases.

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

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

GENETICS

Rhesus Factor and Unknown Genotypes

By the end of the lesson, the learner should be able to:
Describe Rhesus factor genetics. Explain test cross and back cross methods. Use selfing to determine genotypes.

Exposition on Rh factor inheritance using chalkboard. Demonstration of test cross technique. Practice problems on genotype determination.

Textbook, chalkboard, chalk, exercise books

KLB Secondary Biology Form 4, Pages 25-26

GENETICS

Sex Determination

By the end of the lesson, the learner should be able to:
Describe sex determination in humans and other animals. Explain XX/XY sex determination systems. Calculate probability of male/female offspring.

Exposition on sex chromosomes using chalkboard diagrams. Genetic crosses for sex determination. Comparison with other animals.

Textbook, chalkboard, chalk

KLB Secondary Biology Form 4, Pages 26-27

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.

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
SUPPORT AND MOVEMENT

Gene Linkage
Human Axial Skeleton - Skull and Rib Cage

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.
Describe structure and functions of human skull. Explain structure and function of rib cage. Understand protection and support roles. Identify bone features and adaptations.

Exposition on linked genes using simple diagrams. Examples from fruit fly genetics drawn on chalkboard. Discussion on chromosome maps.
Examination of skull and rib cage specimens or models. Drawing skull and rib cage structures. Discussion on brain and organ protection. Analysis of breathing movements and rib articulation. Identification of skull sutures and rib cage components.

Textbook, chalkboard, chalk
Textbook, chalkboard, chalk, skull and rib cage specimens, exercise books

KLB Secondary Biology Form 4, Pages 27-28
KLB Secondary Biology Form 4, Pages 130-131

SUPPORT AND MOVEMENT

Vertebral Column - Cervical and Thoracic Vertebrae

By the end of the lesson, the learner should be able to:
Describe general structure of vertebrae. Identify features of cervical vertebrae including atlas and axis. Explain features and adaptations of thoracic vertebrae. Compare regional vertebrae differences.

Examination of cervical and thoracic vertebrae specimens. Drawing and labeling atlas, axis, and typical cervical vertebrae. Study of thoracic vertebrae and rib articulation points. Discussion on regional adaptations for function. Comparison of vertebrae features.

Textbook, chalkboard, chalk, cervical and thoracic vertebrae specimens, exercise books

KLB Secondary Biology Form 4, Pages 131-134

SUPPORT AND MOVEMENT

Vertebral Column - Cervical and Thoracic Vertebrae

By the end of the lesson, the learner should be able to:
Describe general structure of vertebrae. Identify features of cervical vertebrae including atlas and axis. Explain features and adaptations of thoracic vertebrae. Compare regional vertebrae differences.

Examination of cervical and thoracic vertebrae specimens. Drawing and labeling atlas, axis, and typical cervical vertebrae. Study of thoracic vertebrae and rib articulation points. Discussion on regional adaptations for function. Comparison of vertebrae features.

Textbook, chalkboard, chalk, cervical and thoracic vertebrae specimens, exercise books

KLB Secondary Biology Form 4, Pages 131-134

SUPPORT AND MOVEMENT

Vertebral Column - Lumbar, Sacral and Caudal Vertebrae

By the end of the lesson, the learner should be able to:
Identify features of lumbar vertebrae and their weight-bearing adaptations. Describe structure of sacral vertebrae and sacrum formation. Explain structure of caudal vertebrae. Compare all vertebrae types.

Examination of lumbar, sacral, and caudal vertebrae specimens. Drawing large centrum and processes of lumbar vertebrae. Study of sacrum formation and fusion. Discussion on weight support and regional specializations. Complete vertebral column analysis.

Textbook, chalkboard, chalk, lumbar, sacral, and caudal vertebrae specimens, complete vertebral column

KLB Secondary Biology Form 4, Pages 134-136

SUPPORT AND MOVEMENT

Pectoral Girdle and Forelimb Bones
Pelvic Girdle and Hindlimb Bones

By the end of the lesson, the learner should be able to:
Describe structure of pectoral girdle components: scapula and clavicle. Identify forelimb bones: humerus, radius, ulna, carpals, metacarpals, phalanges. Explain joint formations and articulations.
Describe structure of pelvic girdle: ilium, ischium, pubis. Identify hindlimb bones: femur, tibia, fibula, tarsals, metatarsals, phalanges. Explain weight-bearing adaptations and joint formations.

Examination of pectoral girdle and forelimb bones. Drawing and labeling complete forelimb structure. Discussion on shoulder and elbow joint formation. Analysis of bone features and muscle attachment points. Study of pentadactyl limb pattern.
Examination of pelvic girdle and hindlimb bones. Drawing hip bone structure and acetabulum. Study of hindlimb bone features and knee joint. Discussion on weight transmission and locomotion adaptations. Comparison of forelimb and hindlimb structures.

Textbook, chalkboard, chalk, pectoral girdle and forelimb bone specimens, exercise books
Textbook, chalkboard, chalk, pelvic girdle and hindlimb bone specimens, exercise books

KLB Secondary Biology Form 4, Pages 136-138
KLB Secondary Biology Form 4, Pages 138-140

SUPPORT AND MOVEMENT

Pelvic Girdle and Hindlimb Bones

By the end of the lesson, the learner should be able to:
Describe structure of pelvic girdle: ilium, ischium, pubis. Identify hindlimb bones: femur, tibia, fibula, tarsals, metatarsals, phalanges. Explain weight-bearing adaptations and joint formations.

Examination of pelvic girdle and hindlimb bones. Drawing hip bone structure and acetabulum. Study of hindlimb bone features and knee joint. Discussion on weight transmission and locomotion adaptations. Comparison of forelimb and hindlimb structures.

Textbook, chalkboard, chalk, pelvic girdle and hindlimb bone specimens, exercise books

KLB Secondary Biology Form 4, Pages 138-140

SUPPORT AND MOVEMENT

Types of Joints and Their Structure

By the end of the lesson, the learner should be able to:
Identify types of joints: immovable, gliding, and movable (synovial). Describe structure of synovial joints including cartilage, synovial fluid, and ligaments. Explain joint components and their functions.

Examination of different joint types and synovial joint structure. Drawing synovial joint components. Discussion on cartilage function and synovial fluid properties. Analysis of joint mobility and stability. Practical observation of joint movements.

Textbook, chalkboard, chalk, joint specimens or models, exercise books

KLB Secondary Biology Form 4, Pages 140-141

REPRODUCTION IN PLANTS AND ANIMALS

Sexual Reproduction in Plants - Flower Structure
Pollination - Insect Pollinated Flowers

By the end of the lesson, the learner should be able to:
To draw and label a flower. To identify parts of a flower. To explain flower terminologies. To count sepals, petals, stamens and carpels.

Practical work: Examining bean flowers, morning glory, and hibiscus. Dissection of flowers to identify parts. Counting floral parts and recording. Drawing longitudinal section of flower. Discussion: Functions of flower parts.

Bean flowers, Morning glory, Hibiscus, Hand lens, Scalpels, Drawing materials
Insect-pollinated flowers, Hand lens, Measuring rulers, Drawing materials

Certificate Biology Form 3, Pages 115-117

REPRODUCTION IN PLANTS AND ANIMALS

Wind-Pollinated Flowers and Adaptations

By the end of the lesson, the learner should be able to:
To describe structure of wind-pollinated flowers. To identify adaptive features of wind-pollinated flowers. To compare insect and wind pollination.

Practical examination: Structure of grass flowers, maize tassels. Identification of glumes, spikes, spikelets. Tabulate differences between insect and wind-pollinated flowers. Discussion: Adaptive features for wind pollination.

Wind-pollinated flowers (grass, maize), Hand lens, Charts, Drawing materials

Certificate Biology Form 3, Pages 120-121

REPRODUCTION IN PLANTS AND ANIMALS

Self-Pollination Prevention and Fertilisation

By the end of the lesson, the learner should be able to:
To discuss mechanisms preventing self-pollination. To describe fertilisation process in flowering plants. To explain double fertilisation.

Discussion: Methods preventing self-pollination. Teacher exposition: Process of fertilisation. Drawing diagrams showing fertilisation stages. Q/A: Significance of double fertilisation. Discussion: Formation of zygote and endosperm.

Charts showing fertilisation, Drawing materials, Textbook

Certificate Biology Form 3, Pages 121-123

REPRODUCTION IN PLANTS AND ANIMALS

Seed and Fruit Development

By the end of the lesson, the learner should be able to:
To explain seed formation. To describe fruit development. To classify fruits using specific criteria.

Discussion: Process of seed formation from ovule. Explanation of fruit development from ovary. Practical work: Examining variety of fruits. Classification of fruits into types. Recording observations and drawing fruits.

Variety of fruits, Petri dishes, Scalpels, Drawing materials, Charts

Certificate Biology Form 3, Pages 123-126

REPRODUCTION IN PLANTS AND ANIMALS

Placentation and Internal Fruit Structure

By the end of the lesson, the learner should be able to:
To define placentation. To identify types of placentation. To label internal structure of fruits. To examine ovaries of various fruits.

Teacher exposition: Types of placentation. Practical examination: Ovaries of beans, sunflower, pawpaw, orange. Drawing diagrams showing placentation types. Vertical sections of fruits showing internal structure.

Fruits (beans, sunflower, pawpaw, orange), Scalpels, Drawing materials

Certificate Biology Form 3, Pages 124-130

REPRODUCTION IN PLANTS AND ANIMALS

Fruit and Seed Dispersal

By the end of the lesson, the learner should be able to:
To explain adaptive features of fruits and seeds. To identify agents of dispersal. To classify fruits and seeds by dispersal method.

Practical examination: Various fruits and seeds. Grouping according to dispersal methods. Discussion: Adaptive features for wind, water, animal dispersal. Demonstration of seed dispersal mechanisms. Recording observations of external features.

Variety of fruits and seeds, Hand lens, Drawing materials, Collection containers

Certificate Biology Form 3, Pages 130-131

REPRODUCTION IN PLANTS AND ANIMALS

Fruit and Seed Dispersal
Ovum Structure and Fertilisation Process

By the end of the lesson, the learner should be able to:
To explain adaptive features of fruits and seeds. To identify agents of dispersal. To classify fruits and seeds by dispersal method.
To draw and label structure of human ovum. To describe sperm movement in female tract. To explain acrosome function during fertilisation. To outline zygote formation and nuclear fusion.

Practical examination: Various fruits and seeds. Grouping according to dispersal methods. Discussion: Adaptive features for wind, water, animal dispersal. Demonstration of seed dispersal mechanisms. Recording observations of external features.
Drawing and labeling: Mature human ovum structure. Discussion: Sperm journey from vagina to oviduct. Teacher exposition: Acrosome enzymes and zona pellucida penetration. Q/A: Nuclear fusion, chromosome combination and zygote formation.

Variety of fruits and seeds, Hand lens, Drawing materials, Collection containers
Ovum structure charts, Fertilisation diagrams, Drawing materials, Textbook

Certificate Biology Form 3, Pages 130-131
Certificate Biology Form 3, Pages 155-157

REPRODUCTION IN PLANTS AND ANIMALS

Implantation and Pregnancy Indicators

By the end of the lesson, the learner should be able to:
To define implantation and describe the process. To explain chorionic villi formation and anchoring. To identify early signs of pregnancy. To explain HCG hormone function and detection.

Detailed discussion: Implantation timing and chorionic villi development. Teacher exposition: Blastocyst embedding in endometrium. Discussion: Early pregnancy symptoms and HCG hormone. Q/A: Laboratory confirmation methods and pregnancy tests.

Implantation charts, Pregnancy test demonstration materials, Textbook

Certificate Biology Form 3, Pages 158-159

REPRODUCTION IN PLANTS AND ANIMALS

Placenta Structure and Functions

By the end of the lesson, the learner should be able to:
To describe placenta structure and formation. To explain maternal and fetal blood separation. To identify nutrient transfer and gas exchange functions. To discuss placental barrier limitations.

Detailed discussion: Placenta as temporary organ with dual tissue origin. Teacher exposition: Blood vessel arrangement and separation mechanisms. Discussion: Nutrient, oxygen transfer and harmful substance passage. Q/A: Placental protection and its limitations.

Placenta structure diagrams, Function charts, Drawing materials, Textbook

Certificate Biology Form 3, Pages 161-163

REPRODUCTION IN PLANTS AND ANIMALS

Pregnancy Hormones and Parturition

By the end of the lesson, the learner should be able to:
To identify hormones during pregnancy. To explain HCG, progesterone and oestrogen roles. To describe hormonal changes triggering birth. To explain the parturition process.

Discussion: Hormone secretion patterns during pregnancy. Teacher exposition: HCG, progesterone, oestrogen functions and interactions. Detailed explanation: Hormonal triggers for birth and oxytocin role. Q/A: Uterine contractions, cervix dilation and delivery stages.

Pregnancy hormone charts, Birth process diagrams, Hormone level graphs, Textbook

Certificate Biology Form 3, Pages 163-165

REPRODUCTION IN PLANTS AND ANIMALS

Pregnancy Hormones and Parturition
Male Reproductive System Structure and Functions

By the end of the lesson, the learner should be able to:
To identify hormones during pregnancy. To explain HCG, progesterone and oestrogen roles. To describe hormonal changes triggering birth. To explain the parturition process.
To draw and label male reproductive system. To identify testes, epididymis, vas deferens and accessory glands. To describe functions of each component. To explain scrotum function and temperature regulation.

Discussion: Hormone secretion patterns during pregnancy. Teacher exposition: HCG, progesterone, oestrogen functions and interactions. Detailed explanation: Hormonal triggers for birth and oxytocin role. Q/A: Uterine contractions, cervix dilation and delivery stages.
Drawing and labeling: Complete male reproductive system. Teacher demonstration using charts and models. Discussion: Functions of testes, epididymis, vas deferens, accessory glands. Q/A: Scrotum location and temperature regulation for sperm production.

Pregnancy hormone charts, Birth process diagrams, Hormone level graphs, Textbook
Male reproductive system charts, Drawing materials, Models if available, Textbook

Certificate Biology Form 3, Pages 163-165
Certificate Biology Form 3, Pages 164-166

REPRODUCTION IN PLANTS AND ANIMALS

Sperm Structure and Male Hormones

By the end of the lesson, the learner should be able to:
To draw and label spermatozoon structure. To explain head, middle piece and tail functions. To describe testosterone and FSH roles. To identify secondary sexual characteristics.

Drawing and labeling: Detailed sperm structure showing all components. Discussion: Sperm adaptations for fertilization and motility. Teacher exposition: Hormone control of sperm production and male development. Q/A: Testosterone effects and secondary sexual characteristics.

Sperm structure diagrams, Male hormone charts, Drawing materials, Textbook

Certificate Biology Form 3, Pages 166-167

GROWTH AND DEVELOPMENT

Seed Structure - Monocots and Dicots

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.

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.

Soaked bean and maize seeds, Hand lens, Scalpels, Drawing materials, Iodine solution

Certificate Biology Form 3, Pages 182-183

GROWTH AND DEVELOPMENT

Conditions for Germination
Types of Germination

By the end of the lesson, the learner should be able to:
To identify conditions necessary for seed germination. To explain roles of water, oxygen and temperature in germination. To describe enzyme activation and food mobilization. To investigate scarification effects.

Detailed discussion: Water absorption, enzyme activation, hydrolysis reactions. Teacher exposition: Oxygen requirements for respiration and ATP production. Q/A: Temperature effects on enzyme activity. Discussion: Scarification and testa permeability. Demonstration of vernalization concept.

Germination apparatus, Seeds at different stages, Temperature monitoring equipment, Textbook
Germinating seeds at various stages, Drawing materials, Observation trays, Hand lens

Certificate Biology Form 3, Pages 183-184

GROWTH AND DEVELOPMENT

Germination Practical Investigation
Annual Rings and Plant Dormancy

By the end of the lesson, the learner should be able to:
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.
To explain annual ring formation in temperate trees. To describe factors causing plant dormancy. To identify dormancy in buds, seeds and organs. To explain dormancy advantages for plant survival.

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.
Discussion: Annual growth seasons and ring formation. Teacher exposition: Environmental factors triggering dormancy. Q/A: Metabolic changes during dormancy periods. Discussion: Dormancy in bulbs, corms, rhizomes. Examples of seasonal dormancy in tropical plants.

Seeds, Petri dishes, Cotton wool, Measuring rulers, Data recording sheets, Clay pots
Tree trunk cross-sections, Dormant plant organs, Charts, Textbook

Certificate Biology Form 3, Pages 200-201
Certificate Biology Form 3, Page 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.

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

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.

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

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.

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

Certificate Biology Form 3, Pages 189-192

GROWTH AND DEVELOPMENT

Gibberellins, Cytokinins and Other Hormones
Practical Applications of Plant Hormones

By the end of the lesson, the learner should be able to:
To describe gibberellin functions and effects. To explain cytokinin roles in cell division and growth. To identify abscissic acid as growth inhibitor. To describe ethene and florigen effects.
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.

Discussion: Gibberellin effects on stem elongation and seed germination. Teacher exposition: Cytokinin functions in meristematic tissues. Q/A: Abscissic acid antagonistic effects. Discussion: Ethene in fruit ripening and florigen in flowering.
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.

Plant hormone effect charts, Ripening fruits, Textbook
Hormone application examples, Agricultural product samples, Case study materials

Certificate Biology Form 3, Pages 192-194
Certificate Biology Form 3, Pages 191-194

GROWTH AND DEVELOPMENT

Practical Applications of Plant Hormones

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.

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.

Hormone application examples, Agricultural product samples, Case study materials

Certificate Biology Form 3, Pages 191-194

GROWTH AND DEVELOPMENT

Growth Measurement Practical

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.

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

Certificate Biology Form 3, Pages 201-202