Living Things and their Environment

Reproduction in plants - Introduction and parts of a flower

By the end of the lesson, the learner should be able to:

- Identify and observe different parts of a flower
- Draw and label parts of a flower
- Show interest in the role of flowers in plant reproduction

In groups, learners are guided to:
- Take a walk in the school compound to collect flower specimens
- Observe, compare, and describe flowers collected
- Cut flowers longitudinally and use Figure 2.35 to identify all parts
- Draw and label the parts of a flower

What are the different parts of a flower and how are they arranged?

- Comprehensive Integrated Science Learner's Book pg. 81
- Flower specimens
- Hand lens
- Charts showing flower parts
- Razor blade/scalpel

- Observation - Drawings - Oral questions

Living Things and their Environment

Reproduction in plants - Functions of parts of a flower

By the end of the lesson, the learner should be able to:

- Explain the functions of different parts of a flower
- Distinguish between the vegetative and reproductive parts of a flower
- Appreciate the relationship between flower structure and function

In groups, learners are guided to:
- Use digital and print media to identify vegetative and reproductive parts of a flower
- Match each flower part to its correct function using Activity 2b descriptions
- Group parts based on their roles and present to classmates

What is the function of each part of a flower in reproduction?

- Comprehensive Integrated Science Learner's Book pg. 81
- Charts showing flower parts
- Flower specimens
- Digital resources

- Oral questions - Written exercises - Matching activities

Living Things and their Environment

Reproduction in plants - Types of pollination

By the end of the lesson, the learner should be able to:

- Differentiate between self-pollination and cross-pollination
- Draw a table showing differences between the two types
- Appreciate the diversity of pollination strategies in plants

In groups, learners are guided to:
- Use print and digital media to search for information on types and process of pollination
- Discuss differences between self-pollination and cross-pollination
- Draw a comparison table and present findings to class

What is the difference between self-pollination and cross-pollination?

- Comprehensive Integrated Science Learner's Book pg. 86
- Charts showing types of pollination
- Digital resources
- Reference books

- Oral questions - Written exercises - Group discussions

Living Things and their Environment

Reproduction in plants - Adaptations to insect pollination

By the end of the lesson, the learner should be able to:

- Identify adaptations of flowers to insect pollination
- Explain how each adaptation aids the process of pollination
- Show interest in the relationship between flowering plants and insects

In groups, learners are guided to:
- Collect insect-pollinated flowers and observe their features using a hand lens
- Identify adaptations such as colour, scent, nectar, sticky pollen, and petal shape
- Draw and label an insect-pollinated flower
- Present observations to classmates

How are flowers adapted to attract insects for pollination?

- Comprehensive Integrated Science Learner's Book pg. 86
- Insect-pollinated flowers
- Hand lens
- Charts on insect pollination

- Observation - Drawings - Oral questions - Written report

Living Things and their Environment

Reproduction in plants - Adaptations to insect pollination

By the end of the lesson, the learner should be able to:

- Identify adaptations of flowers to insect pollination
- Explain how each adaptation aids the process of pollination
- Show interest in the relationship between flowering plants and insects

In groups, learners are guided to:
- Collect insect-pollinated flowers and observe their features using a hand lens
- Identify adaptations such as colour, scent, nectar, sticky pollen, and petal shape
- Draw and label an insect-pollinated flower
- Present observations to classmates

How are flowers adapted to attract insects for pollination?

- Comprehensive Integrated Science Learner's Book pg. 86
- Insect-pollinated flowers
- Hand lens
- Charts on insect pollination

- Observation - Drawings - Oral questions - Written report

Living Things and their Environment

Reproduction in plants - Adaptations to wind pollination

By the end of the lesson, the learner should be able to:

- Identify adaptations of flowers to wind pollination
- Compare adaptations of wind-pollinated and insect-pollinated flowers
- Appreciate how environmental factors influence flower structure

In groups, learners are guided to:
- Collect wind-pollinated flowers such as grass and observe their features
- Identify adaptations such as feathery stigma, light pollen, and lack of petals
- Draw and label a wind-pollinated flower
- Compare with insect-pollinated flowers using a table

How are the features of wind-pollinated flowers different from those of insect-pollinated flowers?

- Comprehensive Integrated Science Learner's Book pg. 86
- Wind-pollinated flowers (e.g. grass)
- Charts showing wind pollination
- Hand lens

- Observation - Drawings - Oral questions - Written report

Living Things and their Environment

Reproduction in plants - Effects of agrochemicals on pollination

By the end of the lesson, the learner should be able to:

- Discuss the effects of agrochemicals on pollinators
- Explain how reduction of pollinators impacts plant reproduction and food production
- Show concern for environmental conservation

In groups, learners are guided to:
- Discuss how pesticides harm pollinators such as bees and butterflies
- Research and discuss how loss of pollinators impacts crop yields and biodiversity
- Present findings to class using magazines and digital resources

How do agrochemicals affect pollinators and what impact does this have on plant reproduction?

- Comprehensive Integrated Science Learner's Book pg. 86
- Science magazines
- Digital resources
- Reference books

- Oral questions - Written exercises - Group presentations

Living Things and their Environment

Reproduction in plants - Fertilisation in flowering plants

By the end of the lesson, the learner should be able to:

- Describe the process of fertilisation in flowering plants
- Explain the growth of the pollen tube and fusion of gametes
- Appreciate the complexity of fertilisation in plant reproduction

In groups, learners are guided to:
- Use digital media to search for videos or pictures showing fertilisation in flowering plants
- Discuss the stages of fertilisation from pollen landing on stigma to gamete fusion
- Draw a diagram illustrating the fertilisation process and write short notes

How does fertilisation occur in flowering plants after pollination?

- Comprehensive Integrated Science Learner's Book pg. 91
- Charts showing fertilisation stages
- Digital resources
- Reference books

- Oral questions - Written exercises - Diagrams

Living Things and their Environment

Reproduction in plants - Seed and fruit formation

By the end of the lesson, the learner should be able to:

- Describe the formation of seeds and fruits after fertilisation
- Explain the changes that occur in flower parts after fertilisation
- Show interest in how a fertilised ovule develops into a seed and ovary into a fruit

In groups, learners are guided to:
- Study charts and diagrams showing post-fertilisation changes in a flower
- Discuss how the ovule develops into a seed and the ovary into a fruit
- Draw a diagram showing the four stages from fertilisation to seed and fruit formation
- Present findings to class

How do seeds and fruits develop from a fertilised flower?

- Comprehensive Integrated Science Learner's Book pg. 91
- Charts showing fruit and seed development
- Fruit specimens
- Digital resources

- Oral questions - Written exercises - Drawings

Living Things and their Environment

Reproduction in plants - Modes of fruit and seed dispersal

By the end of the lesson, the learner should be able to:

- Categorise fruits and seeds based on their mode of dispersal
- Identify adaptive features that aid in each mode of dispersal
- Appreciate how adaptations improve survival chances of plant species

In groups, learners are guided to:
- Collect safe wild fruits and seeds from the school locality
- Observe their features and categorise them by mode of dispersal: wind, water, animals, and self-dispersal
- Draw pictures of fruits and seeds alongside their adaptive features for dispersal

How are fruits and seeds adapted for dispersal and why is dispersal important for plants?

- Comprehensive Integrated Science Learner's Book pg. 94
- Various fruit and seed specimens
- Charts showing dispersal methods
- Hand lens

- Observation - Classification activities - Oral questions - Written report

Living Things and their Environment

Reproduction in plants - Importance of fruit and seed dispersal

By the end of the lesson, the learner should be able to:

- Discuss the benefits of fruit and seed dispersal to plant survival
- Explain how dispersal reduces competition for resources among plants
- Show interest in the relationship between dispersal and plant distribution

In groups, learners are guided to:
- Observe plants in the school compound and compare plants with seedlings near and far from the parent plant
- Discuss benefits of dispersal including reducing competition for space, light, and nutrients
- Relate dispersal to colonisation of new habitats and present ideas to class

Why is it important for fruits and seeds to be dispersed away from the parent plant?

- Comprehensive Integrated Science Learner's Book pg. 94
- Plants in school compound
- Pictures of seedling distribution
- Digital resources

- Oral questions - Written exercises - Group discussions

Living Things and their Environment

Reproduction in plants - Role of flowers in nature

By the end of the lesson, the learner should be able to:

- Discuss the ecological and economic roles of flowers in nature
- Explain how flowers support reproduction, food chains, and biodiversity
- Appreciate the significance of flowers to humans and other living things

In groups, learners are guided to:
- Search for information on the role of flowers in nature using print and digital media
- Discuss how flowers support plant reproduction, attract pollinators, and provide food for animals
- List benefits of flowers to humans and animals and present to class

What roles do flowers play in nature beyond their role in reproduction?

- Comprehensive Integrated Science Learner's Book pg. 97
- Digital resources
- Flower specimens
- Reference books

- Oral questions - Written exercises - Group presentations

Living Things and their Environment

Reproduction in plants - Assessment

By the end of the lesson, the learner should be able to:

- Attempt assessment questions on reproduction in plants
- Apply knowledge to explain pollination, fertilisation, and seed dispersal
- Show confidence in their understanding of plant reproduction

In groups, learners are guided to:
- Attempt written assessment questions on parts of a flower, pollination, fertilisation, and dispersal
- Discuss solutions and review key concepts
- Reflect on areas needing further study

How does understanding reproduction in plants explain how flowering plants maintain biodiversity?

- Comprehensive Integrated Science Learner's Book pg. 80–97
- Assessment questions
- Previous notes

- Written test - Peer assessment - Oral questions

Living Things and their Environment

Reproduction in plants - Assessment

By the end of the lesson, the learner should be able to:

- Attempt assessment questions on reproduction in plants
- Apply knowledge to explain pollination, fertilisation, and seed dispersal
- Show confidence in their understanding of plant reproduction

In groups, learners are guided to:
- Attempt written assessment questions on parts of a flower, pollination, fertilisation, and dispersal
- Discuss solutions and review key concepts
- Reflect on areas needing further study

How does understanding reproduction in plants explain how flowering plants maintain biodiversity?

- Comprehensive Integrated Science Learner's Book pg. 80–97
- Assessment questions
- Previous notes

- Written test - Peer assessment - Oral questions

Living Things and their Environment

Reproduction in plants - Project: Flower collection and dissection

By the end of the lesson, the learner should be able to:

- Collect, dissect, and present different types of flowers
- Demonstrate understanding of flower parts through a practical project
- Appreciate the diversity and beauty of flowering plants

In groups, learners are guided to:
- Collect a variety of flowers from the school compound or local environment
- Dissect the flowers and mount the parts for display
- Label and present each flower's parts to classmates with explanations

How do the structures of flowers differ between species and what can we learn from these differences?

- Comprehensive Integrated Science Learner's Book pg. 81–97
- Flower specimens
- Hand lens
- Razor blade
- Chart paper
- Glue

- Project work - Peer assessment - Oral presentation

Living Things and their Environment

Reproduction in plants - Consolidation: Pollination to dispersal

By the end of the lesson, the learner should be able to:

- Sequence the stages from pollination to seed and fruit dispersal
- Relate each stage to the next in a logical flow
- Show confidence in explaining the complete cycle of plant reproduction

In groups, learners are guided to:
- Review the full sequence from pollination through fertilisation, seed/fruit formation, to dispersal
- Create a flow diagram showing the stages of plant reproduction
- Discuss how each stage depends on the previous one
- Present flow diagrams to class

How do the stages of plant reproduction from pollination to dispersal form a complete cycle?

- Comprehensive Integrated Science Learner's Book pg. 80–97
- Previous notes
- Charts
- Manila paper
- Felt pens

- Drawings - Oral questions - Written exercises

Living Things and their Environment

The interdependence of life - Biotic components of the environment

By the end of the lesson, the learner should be able to:

- Identify and list biotic components of the environment
- Observe and describe interactions between living organisms
- Show interest in the role of living things in an ecosystem

In groups, learners are guided to:
- Take a nature walk in the school compound to identify living organisms
- List biotic components observed and describe their interactions
- Determine biotic components from pictures of ecosystems such as aquarium and potted plant

What are the biotic components of the environment and how do they interact?

- Comprehensive Integrated Science Learner's Book pg. 99
- School compound
- Digital resources
- Pictures of ecosystems

- Observation - Oral questions - Written exercises

Living Things and their Environment

The interdependence of life - Abiotic components of the environment

By the end of the lesson, the learner should be able to:

- Identify abiotic components of the environment
- Discuss effects of abiotic factors such as light, temperature, pH, and salinity on organisms
- Appreciate the role of non-living factors in supporting life

In groups, learners are guided to:
- Discuss effects of temperature, light, pH, humidity, and salinity on living organisms
- Study photographs of plants growing under different environmental conditions
- Compare plant growth under different abiotic conditions and make notes

How do non-living components of the environment affect the survival of living organisms?

- Comprehensive Integrated Science Learner's Book pg. 99
- Digital resources
- Photographs of plants in different environments
- Reference books

- Oral questions - Written exercises - Group discussions

Living Things and their Environment

The interdependence of life - Effects of biotic components on organisms

By the end of the lesson, the learner should be able to:

- Explain the effects of biotic factors including predation, competition, and symbiosis
- Discuss parasitism, mutualism, and commensalism with examples
- Show interest in the complex relationships between living organisms

In groups, learners are guided to:
- Study pictures and scenarios showing predation, competition, parasitism, and mutualism
- Discuss examples such as lion-antelope, mosquito-human, and ox-pecker-buffalo
- Present findings on how each biotic relationship affects the organisms involved

How do biotic factors such as predation, competition, and symbiosis affect living organisms in an ecosystem?

- Comprehensive Integrated Science Learner's Book pg. 99
- Science textbooks
- Digital resources
- Photographs of biotic interactions

- Oral questions - Written exercises - Group presentations

Living Things and their Environment

The interdependence of life - Energy flow: Food chains

By the end of the lesson, the learner should be able to:

- Construct simple food chains from organisms in a local ecosystem
- Identify producers, consumers, and trophic levels in a food chain
- Show interest in how energy flows through an ecosystem

In groups, learners are guided to:
- Take a nature walk and identify organisms in the school neighbourhood
- Arrange identified organisms based on their feeding relationships
- Draw food chains using arrows to show direction of energy flow
- Identify trophic levels and discuss what would happen if one organism were removed

How does energy flow from one organism to another in a food chain?

- Comprehensive Integrated Science Learner's Book pg. 106
- School neighbourhood
- Charts showing food chains
- Manila paper
- Coloured pencils

- Observation - Drawings - Written exercises - Oral questions

Living Things and their Environment

The interdependence of life - Energy flow: Food webs

By the end of the lesson, the learner should be able to:

- Construct a food web by linking multiple food chains
- Explain how organisms can occupy more than one trophic level
- Appreciate the complexity and interdependence of energy flow in an ecosystem

In groups, learners are guided to:
- Study pictures of organisms at different trophic levels and draw arrows showing feeding relationships
- Construct multiple food chains and link them to form a food web
- Discuss what a food web reveals about the complexity of feeding relationships in nature

How does a food web show the interconnected feeding relationships in an ecosystem?

- Comprehensive Integrated Science Learner's Book pg. 110
- Charts showing food webs
- Digital resources
- Manila paper
- Coloured pencils

- Drawings - Written exercises - Oral questions

Living Things and their Environment

The interdependence of life - Role of decomposers in an ecosystem

By the end of the lesson, the learner should be able to:

- Discuss the role of decomposers in breaking down organic matter in an ecosystem
- Explain how decomposers help recycle nutrients back into the soil
- Appreciate the importance of decomposers in maintaining ecosystem balance

In groups, learners are guided to:
- Study pictures of decomposition and identify organisms growing on decaying matter
- Discuss examples of decomposers such as bacteria and fungi
- Explain how decomposers return nutrients to the soil and their importance in element cycles
- Present findings to class

What role do decomposers play in an ecosystem and how do they help recycle nutrients?

- Comprehensive Integrated Science Learner's Book pg. 114
- Pictures of decomposition
- Digital resources
- Science textbooks

- Oral questions - Written exercises - Group discussions

Living Things and their Environment

The interdependence of life - Role of decomposers in an ecosystem

By the end of the lesson, the learner should be able to:

- Discuss the role of decomposers in breaking down organic matter in an ecosystem
- Explain how decomposers help recycle nutrients back into the soil
- Appreciate the importance of decomposers in maintaining ecosystem balance

In groups, learners are guided to:
- Study pictures of decomposition and identify organisms growing on decaying matter
- Discuss examples of decomposers such as bacteria and fungi
- Explain how decomposers return nutrients to the soil and their importance in element cycles
- Present findings to class

What role do decomposers play in an ecosystem and how do they help recycle nutrients?

- Comprehensive Integrated Science Learner's Book pg. 114
- Pictures of decomposition
- Digital resources
- Science textbooks

- Oral questions - Written exercises - Group discussions

Living Things and their Environment

The interdependence of life - Effect of human activities on the environment

By the end of the lesson, the learner should be able to:

- Identify human activities that affect the environment positively and negatively
- Explain the impact of deforestation, poaching, and introduction of invasive species
- Show concern for environmental conservation and sustainable living

In groups, learners are guided to:
- Brainstorm a list of human activities and their effects on the environment
- Search for information on deforestation, poaching, and pollution
- Categorise activities as positive or negative and discuss solutions to environmental problems
- Present findings to class

How do human activities affect the balance and biodiversity of ecosystems?

- Comprehensive Integrated Science Learner's Book pg. 113
- Charts showing human activities
- Digital resources
- Journals and photographs

- Oral questions - Written exercises - Group presentations

Living Things and their Environment

The interdependence of life - Importance of interdependence

By the end of the lesson, the learner should be able to:

- Discuss the importance of interdependence between living and non-living components
- Explain how interdependence supports the stability and functioning of ecosystems
- Appreciate the significance of every organism in maintaining ecological balance

In groups, learners are guided to:
- Read and discuss information on the importance of interdependence in ecosystems
- Identify specific examples of how living and non-living components rely on each other
- Present findings and discuss consequences of disrupting interdependence

Why is interdependence between living and non-living components important for ecosystem stability?

- Comprehensive Integrated Science Learner's Book pg. 99
- Digital resources
- Science textbooks
- Reference books

- Oral questions - Written exercises - Group presentations

Living Things and their Environment

The interdependence of life - Review and summary

By the end of the lesson, the learner should be able to:

- Summarise key concepts on the interdependence of life
- Relate biotic and abiotic components to the functioning of ecosystems
- Show confidence in discussing ecological relationships

In groups, learners are guided to:
- Review key concepts on biotic and abiotic components, food chains, food webs, decomposers, and human activities
- Create a mind map or summary notes linking the key concepts
- Discuss any areas of difficulty and seek clarification

How do all the concepts on the interdependence of life relate to maintaining a balanced ecosystem?

- Comprehensive Integrated Science Learner's Book pg. 99–115
- Previous notes
- Charts
- Manila paper

- Oral questions - Written exercises - Mind maps

Living Things and their Environment

The interdependence of life - Assessment

By the end of the lesson, the learner should be able to:

- Attempt assessment questions on the interdependence of life
- Apply knowledge to explain ecological interactions and ecosystem stability
- Show confidence in their understanding of the sub-strand

In groups, learners are guided to:
- Attempt written assessment questions on food chains, food webs, decomposers, and human activities
- Discuss solutions and review key concepts
- Reflect on areas requiring further attention

How does understanding the interdependence of life help explain the stability and functioning of ecosystems?

- Comprehensive Integrated Science Learner's Book pg. 99–115
- Assessment questions
- Previous notes

- Written test - Peer assessment - Oral questions

Force and Energy

Curved mirrors - Types of curved mirrors

By the end of the lesson, the learner should be able to:

- Define the term curved mirror
- Describe the types of curved mirrors (concave, convex and parabolic)
- Show interest in learning about curved mirrors and their reflecting surfaces

In groups, learners are guided to:

- Discuss the meaning of reflection and how mirrors form images
- Discuss the types of curved mirrors: concave (reflecting surface curved inwards), convex (reflecting surface curved outwards) and parabolic
- Use a shiny spoon to compare concave and convex surfaces

How are curved mirrors used in day-to-day life?

- Comprehensive Integrated Science Grade 9 pg. 117
- Shiny spoons
- Reference books
- Charts showing types of curved mirrors
- Charts showing reflection in concave and convex surfaces
- Reference books

- Observation - Oral questions

Force and Energy

Curved mirrors - Key terms used in curved mirrors

By the end of the lesson, the learner should be able to:

- Define key terms used in curved mirrors (aperture, pole, centre of curvature, radius of curvature)
- Identify and label the parts of a curved mirror on a diagram
- Show interest in understanding the terminology of curved mirrors

In groups, learners are guided to:

- Study diagrams of concave and convex mirrors and discuss the terms aperture, pole, centre of curvature and radius of curvature
- Identify and label these parts on diagrams of curved mirrors
- Draw the diagrams and label the parts in exercise books

What do the key terms used in curved mirrors tell us about how the mirror is shaped?

- Comprehensive Integrated Science Grade 9 pg. 118
- Charts showing parts of a concave mirror
- Exercise books, pencil
- Charts showing focal length and radius of curvature
- Reference books

- Observation - Oral questions

Force and Energy

Curved mirrors - Determining the focal length of a concave mirror
Curved mirrors - Determining the focal length of a concave mirror by focusing on a distant object

By the end of the lesson, the learner should be able to:

- Describe how the focal length of a concave mirror is determined using a burning candle and screen
- Carry out an experiment to determine the focal length of a concave mirror
- Show interest in practical methods of measuring focal length

In groups, learners are guided to:

- Place a concave mirror on a mirror holder; put a burning candle in front and a white screen between them
- Adjust distances until a sharp clear image appears on the white screen
- Measure the distance between the mirror and the screen; identify this as the focal length
- Share and discuss findings with classmates

How can the focal length of a concave mirror be measured experimentally?

- Comprehensive Integrated Science Grade 9 pg. 120
- Concave mirror, mirror holder, burning candle, white screen, metre rule
- Concave mirror, mirror holder, white screen, metre rule
- Distant object (e.g. tree outside classroom)

- Observation - Oral questions

Force and Energy

Curved mirrors - Image formation in concave mirrors (introduction)

By the end of the lesson, the learner should be able to:

- Explain what an image is in the context of curved mirrors
- Distinguish between real and virtual images
- Show curiosity in investigating how concave mirrors form images

In groups, learners are guided to:

- Discuss the meaning of an image as formed by a curved mirror
- Study pictures of images formed by concave and convex mirrors and describe whether each is upright, same size, smaller or larger than the object
- Discuss real images (formed on a screen, e.g. concave mirror reflecting a distant object) and virtual images (seen inside the mirror, e.g. convex mirror)

What is the difference between a real image and a virtual image?

- Comprehensive Integrated Science Grade 9 pg. 122
- Concave mirror, convex mirror
- Charts showing real and virtual images

- Oral questions - Observation

Force and Energy

Curved mirrors - Guidelines for reflection of rays by a concave mirror
Curved mirrors - Locating images formed by a concave mirror (object at infinity and beyond C)

By the end of the lesson, the learner should be able to:

- State the four guidelines for reflection of rays by a concave mirror
- Draw ray diagrams showing how rays are reflected by a concave mirror
- Demonstrate diligence in drawing accurate ray diagrams

In groups, learners are guided to:

- Study diagrams A, B, C and D showing the four guidelines for reflection of rays by a concave mirror
- Discuss the origin and path taken by each ray (ray through centre of curvature, ray parallel to principal axis, ray through principal focus, ray incident at the pole)
- Draw ray diagrams showing reflection of rays by a concave mirror in exercise books

How do the guidelines for ray reflection help in locating images formed by a concave mirror?

- Comprehensive Integrated Science Grade 9 pg. 122
- Charts showing guidelines for reflection of rays
- Exercise books, pencil, ruler
- Concave mirror (focal length 10 cm), burning candle, white screen, metre rule, mirror holder

- Observation - Written assignments

Force and Energy

Curved mirrors - Locating images formed by a concave mirror (object between C and F, and between F and P)

By the end of the lesson, the learner should be able to:

- Locate the image formed by a concave mirror when the object is between C and F, and between F and P
- Draw ray diagrams for these object positions
- Appreciate how object position determines image characteristics

In groups, learners are guided to:

- Carry out Activity 6c: place candle at 15 cm (between focal length and centre of curvature); locate image on screen; note characteristics
- Carry out Activity 6d: place candle at 8 cm (between principal focus and pole); attempt to locate image; note that a virtual, upright, magnified image is seen inside the mirror
- Draw ray diagrams and share findings with classmates

Why is the image formed when the object is between the focus and the pole of a concave mirror virtual and upright?

- Comprehensive Integrated Science Grade 9 pg. 122
- Concave mirror (focal length 10 cm), burning candle, white screen, metre rule, mirror holder

- Observation - Written tests

Force and Energy

Curved mirrors - Characteristics of images formed by a concave mirror

By the end of the lesson, the learner should be able to:

- Summarise the characteristics of images formed by a concave mirror for all object positions
- Complete a table of image characteristics for all object positions
- Show confidence in reading and interpreting ray diagrams for a concave mirror

In groups, learners are guided to:

- Study Table 23 showing ray diagrams and image characteristics for all object positions in a concave mirror (at infinity, beyond C, at C, at F, between C and F, between F and P)
- Copy and complete a summary table of image positions and characteristics
- Discuss the pattern in image characteristics as the object moves from infinity to between F and P

What pattern can be observed in the characteristics of images as the object moves closer to a concave mirror?

- Comprehensive Integrated Science Grade 9 pg. 122
- Charts showing Table 23 (image characteristics)
- Exercise books, pencil

- Written assignments - Oral questions

Force and Energy

Curved mirrors - Applications of concave mirrors in day-to-day life

By the end of the lesson, the learner should be able to:

- Identify the applications of concave mirrors in day-to-day life
- Explain why concave mirrors are used in specific applications
- Appreciate the importance of concave mirrors in technology and daily life

In groups, learners are guided to:

- Use reference books or digital devices to search for information about applications of concave mirrors
- Discuss applications: solar concentrators, car headlamps, shaving mirrors, dentists' mirrors, projector lamps, telescopes
- Relate the property of the concave mirror (converging rays) to each application
- Present and discuss findings with classmates

Why are concave mirrors used in car headlamps and solar concentrators?

- Comprehensive Integrated Science Grade 9 pg. 122
- Internet access
- Reference books
- Pictures of concave mirror applications

- Oral questions - Written assignments

Force and Energy

Curved mirrors - Reflection of rays by a convex mirror and image characteristics

By the end of the lesson, the learner should be able to:

- State the four ways in which rays are reflected by a convex mirror
- Describe the characteristics of images formed by a convex mirror
- Show interest in comparing image formation in concave and convex mirrors

In groups, learners are guided to:

- Hold a convex mirror and a pencil; observe the image as the pencil is moved towards and away from the mirror
- Study diagrams showing the four ways rays are reflected by a convex mirror
- Discuss and draw the guidelines for reflection of rays by a convex mirror in exercise books

How does a convex mirror always produce a virtual, upright and diminished image regardless of object position?

- Comprehensive Integrated Science Grade 9 pg. 122
- Convex mirror, pencil
- Charts showing reflection of rays by a convex mirror

- Observation - Oral questions

Force and Energy

Curved mirrors - Reflection of rays by a convex mirror and image characteristics

By the end of the lesson, the learner should be able to:

- State the four ways in which rays are reflected by a convex mirror
- Describe the characteristics of images formed by a convex mirror
- Show interest in comparing image formation in concave and convex mirrors

In groups, learners are guided to:

- Hold a convex mirror and a pencil; observe the image as the pencil is moved towards and away from the mirror
- Study diagrams showing the four ways rays are reflected by a convex mirror
- Discuss and draw the guidelines for reflection of rays by a convex mirror in exercise books

How does a convex mirror always produce a virtual, upright and diminished image regardless of object position?

- Comprehensive Integrated Science Grade 9 pg. 122
- Convex mirror, pencil
- Charts showing reflection of rays by a convex mirror

- Observation - Oral questions

Force and Energy

Curved mirrors - Locating images formed by a convex mirror

By the end of the lesson, the learner should be able to:

- Locate the image formed by a convex mirror using an experiment
- Draw ray diagrams to show the image formed by a convex mirror
- Appreciate the difference in image formation between concave and convex mirrors

In groups, learners are guided to:

- Carry out Activity 10: place a burning candle on the table between the convex mirror and a white screen; move the screen to try to obtain an image; note that no image forms on the screen
- Move the candle or mirror to vary the image distance; record observations
- Draw ray diagrams showing the image formed by a convex mirror for various object positions

Why can the image formed by a convex mirror not be captured on a screen?

- Comprehensive Integrated Science Grade 9 pg. 122
- Convex mirror (focal length 10 cm), burning candle, white screen, metre rule, mirror holder

- Observation - Written tests

Force and Energy

Curved mirrors - Applications of convex mirrors in day-to-day life

By the end of the lesson, the learner should be able to:

- Identify the applications of convex mirrors in day-to-day life
- Explain why convex mirrors are used as driving mirrors and in supermarkets
- Appreciate the importance of convex mirrors in safety and security

In groups, learners are guided to:

- Use reference books and digital devices to search for information about applications of convex mirrors
- Discuss applications: driving mirrors, mirrors used in supermarkets and security purposes
- Relate the property of the convex mirror (wide field of view, always produces a virtual, upright and diminished image) to each application
- Present and discuss findings with classmates

Why are convex mirrors preferred as rear-view mirrors in vehicles?

- Comprehensive Integrated Science Grade 9 pg. 122
- Internet access
- Reference books
- Pictures of convex mirror applications

- Oral questions - Written assignments

Force and Energy

Curved mirrors - Parabolic mirrors and their applications

By the end of the lesson, the learner should be able to:

- Describe the parabolic mirror and how it reflects light
- Identify the applications of parabolic mirrors in day-to-day life
- Show appreciation for the role of parabolic mirrors in technology

In groups, learners are guided to:

- Discuss the parabolic mirror: inward curved surface that directs all incoming rays to converge at its focal point; rays then diverge parallel to the principal axis
- Discuss applications: focusing or projecting light energy, heat energy, sound energy and radio waves; use in telescopes to improve image clarity
- Use digital or print media to explore more about parabolic mirrors

How does a parabolic mirror maintain the strength of light or radio waves over long distances?

- Comprehensive Integrated Science Grade 9 pg. 122
- Internet access
- Reference books
- Pictures of parabolic mirrors and telescopes

- Oral questions - Written assignments