Lesson Notes By Weeks and Term v4 - JHS 1

Lesson Video

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Performance objectives

• Describe the stages in the life cycle of plants and animals.
• Explain the difference between complete and incomplete metamorphosis.
• Illustrate the life cycle of at least two different organisms.
• Understand the importance of each stage for survival.
• Connect life cycles to real-life situations in Ghana.

Lesson summary

All living things (plants and animals) go through a life cycle—a series of stages from birth (or germination/hatching) to growth, reproduction, and death. Understanding life cycles helps Ghanaian learners to: improve farming and gardening (e.g., knowing when maize flowers and produces seeds), control pests and disease vectors (e.g., mosquitoes that spread malaria), care for pets and livestock (e.g., chickens, goats, fish), protect biodiversity in forests, rivers, and coastal areas. NaCCA alignment (Indicator B7.2.2.1.1 and B8/JHS2.2.2.1.1): Learners identify, describe, and compare life cycles of organisms, showing stages and explaining how reproduction continues the cycle.

Lesson notes

2.1 Key Definitions Organism: Any living thing (plant, animal, fungus, microorganism). Life cycle: The sequence of stages an organism passes through from the beginning of life to reproduction and death. Growth: Increase in size and complexity (cells increase; body develops). Development: Changes in form and function as an organism matures. Reproduction: Process by which living things produce offspring (young ones), ensuring continuity of the species. Metamorphosis: A major change in body form during development (common in insects and amphibians). Complete metamorphosis: egg → larva → pupa → adult Incomplete metamorphosis: egg → nymph → adult 2.2 Common Stages in Life Cycles (Big Idea) Although organisms differ, many life cycles include: Beginning stage (seed/egg/birth) Growth and development (young stage) Maturity (adult stage) Reproduction (producing seeds/eggs/young ones) Death (end of individual life, but species continues through offspring)

2.3 Life Cycle of a Flowering Plant (Example: Maize or Bean) Stages (with explanation) Seed stage A seed contains an embryo (baby plant) and stored food. Example: maize grains or bean seeds. Germination The seed begins to grow when conditions are right: Water (moisture) Air (oxygen) Warmth (suitable temperature) The radicle (young root) comes out first, then the shoot. Seedling Young plant with small leaves. Needs sunlight, water, minerals from soil. Mature plant Plant grows bigger; produces flowers. In maize: tassel (male flowers) and silk/cob (female parts). Pollination and fertilisation Pollination: transfer of pollen to stigma (or silk in maize). Fertilisation: male cell joins female cell to form a new seed. Fruit/seed formation New seeds develop (e.g., maize grains on the cob; beans in pods). Seed dispersal Seeds spread by wind, animals, water, or humans (farmers). Cycle repeats when seeds germinate again.

Worked Ghanaian example (realistic): A farmer in Northern Ghana plants maize at the start of the rains. After germination and growth, maize flowers. If pollination occurs well, cobs fill with grains. Those grains are seeds that can be stored and planted next season—this is the life cycle continuing.

2.4 Life Cycle of an Insect with Complete Metamorphosis (Example: Mosquito)