Living Organisms

In year 2, you explored selected insects like grain weevil, butterfly, housefly and honeybee, covering their life cycle, characteristics, economic importance and population control. This was to help you understand their impact on plant and animal life in ecosystems. You also learned about tropical habitats and adaptations of organisms within these environments.

Moving forward, you will be discussing specific organisms from the different classes of vertebrates, i.e. Tilapia (Osteichthyes), toad/frog (Amphibia), wall gecko (Reptilia) and domestic fowl (Aves), as well as interdependencies within ecosystems and ecological data analysis. Additionally, you will be studying diseases that affect humans, plants and animals from an ecological, economic and global perspective.

KEY IDEAS

• Changes in the environment, such as climate change, can disrupt the interdependencies among organisms, leading to decreased biodiversity and a compromised ecosystem.

• Domestic fowl are highly reproductive and adaptable to various environments. They are a crucial source of proteins and income for many households and industries worldwide.

• Emerging diseases are infectious diseases that have recently appeared in a population for the first time, or that previously existed but are rapidly increasing in incidence, expanding into new geographical areas, or affecting new host populations. Prevention of these diseases can be done by vaccination, watching for outbreaks, teaching people about hygiene and safety, and doing research to find better ways to diagnose and treat these illnesses.

• Frogs and toads have a unique life cycle transitioning between aquatic and terrestrial environments. Some species are economically important for food and scientific research.

• Organisms interact through food webs, where producers, consumers, and decomposers rely on one another for survival and energy flow.

• Tilapia is highly adaptable to different environments and can thrive in various water conditions, making it an excellent candidate for aquaculture. It is a significant source of food and income for many communities worldwide.

• Wall geckos have specialised toe pads that enable them to climb walls and ceilings. They are also important in the biological control of pests through their feeding.

Characteristic Features of Tilapia

Tilapia can grow well in various water conditions, including freshwater habitats such as lakes, rivers, ponds and to some extent, lagoons. They can tolerate changes in temperature, pH and salinity.

Tilapia has a streamlined (smooth, oval, curved surfaces that allow water to flow easily around it), laterally flattened body shape.

1. The body is covered with large smooth cycloid scales that are often greyish or brownish in colour. The cycloid scales protect it from injury and infection, reduce friction and aid movement in water.

2. It has both paired and unpaired fins, which provide stability and are used for its movement in water. The paired fins are the pelvic and pectoral fins. The unpaired fins are the dorsal, ventral/anal and caudal/tail fins.

3. The lateral line has tiny pits that are used for detecting changes in the pressure in the water

4. The operculum is a flat bony plate that covers and protects the gills.

5. The wide terminal mouth is used to feed on a wide range of food.

Figure 3.1: External features of Tilapia Tilapia shows the tendency for rapid growth and reaches a marketable size in a matter of months. It can grow up to 2-3 feet (60-90 cm) in length and weigh up to 5-6 pounds (2.3- 2.7 kg).

Tilapia is relatively disease-resistant and can survive in crowded conditions. It is a prolific breeder, with females capable of spawning multiple times in a year, coupled with its fast growth rate and disease resistance, making it the choice of many farmers in aquaculture.

Some life processes of tilapia Nutrition Tilapia is omnivorous, meaning it feeds on a variety of foods, which include algae, plankton, aquatic plants and small invertebrates. It uses its mouth to scrape algae from surfaces. During feeding, it takes in water through its mouth. The water passes over the gill rakers, which are bony or cartilaginous projections on the gill bar. The gill bar supports, protects and filters food from the water that passes over them in fish and in some other aquatic animals.

Figure 3.2: The gills of Tilapia The filtered food particles are kept in the mouth or pharynx, which is behind the buccal cavity (the mouth), and swallowed. The filtered water is expelled through the gills or other openings. This process of feeding is known as filter feeding.

Excretion Tilapia excretes ammonia (a nitrogenous waste), and carbon dioxide through its gills.

Excess salts and water are excreted by the kidneys in the form of urine.

Note: The urine produced by Tilapia is not like human urine in that it is mostly ammonia- free. The gills handle most of the ammonia removal from its body.

Reproduction Tilapia reproduces by spawning. This is where males fertilise eggs released by females in shallow pits in the bed of a pond or lake. This type of fertilisation is called external fertilisation. Some species of Tilapia also exhibit mouthbrooding, where the female incubates the eggs in her mouth until they hatch into larvae called fry. This show of parental care protects the young against predators.

Movement

1. The fins are used for movement through water.

a. Driving the fish forward is brought about by the side-to-side lashing of the caudal fin. This rapid movement is controlled by the contraction of the well-developed muscle blocks on both sides of the body of the fish, especially in the tail region.

b. During rapid movement, the paired fins are held close to the body, and when extended, they slow down or stop the movement of the fish.

c. The caudal fin also works with the paired fins in steering (changing the direction) the fish through the water. The pectoral and pelvic fins are for steering, pitching and stability.

d. The other unpaired fins, i.e. dorsal and anal fins, control yawing and rolling.

2. The streamlined body shape is for efficient movement in the water.

3. The slimy nature of the body surface, also known as the mucus layer, reduces drag and friction as it moves through the water.

4. The air or swim bladder provides buoyancy, i.e. makes it float in the water without swimming. This happens when gases diffuse from the blood into the bladder and inflate it, rendering the fish less dense and causing it to rise easily. When the bladder is deflated, the fish becomes denser and sinks.

Figure 3.3: Different types of movement exhibited by Tilapia Economic Importance of Tilapia

1. Tilapia is rich in protein and low in fat, making it a valuable source of nutrition. It offers numerous health benefits due to its high protein content, low saturated fat levels, rich omega-3 fatty acid profile and a good source of vitamins and minerals such as vitamin D, potassium and selenium.

2. Aquaculture practices provide a source of income for many people in the industry.

Farming tilapia is possible due to its characteristics of rapid growth, disease resistance and ability to thrive in diverse conditions. It can be raised in environmentally sustainable ways, such as an integrated farming system that makes use of waste products for crop production as feed for the fish.

3. Tilapia farming, processing and distribution create jobs for people in rural areas, which contributes to local economies and livelihoods. In Ghana, the farming of Tilapia has created livelihood opportunities for many people in both rural and peri-urban areas.

For example, the people of Weija, Akosombo and Ada trade in the fresh or dried tilapia.

4. Tilapia is exported to many countries, generating foreign exchange earnings for Ghana, hence supporting the national economy.

5. In many cultures, tilapia is associated with traditional fishing practices and culinary heritage. This promotes local customs and tourism. For example, in Ghana, Tilapia is a popular dish often served in hotels, restaurants, and other eating places and has become an important part of Ghanaian hospitality, reflecting the country’s wealth of local cuisine.

6. The tilapia industry drives research in aquaculture practices, genetics, and nutrition, leading to new ways of improving fish farming efficiency and sustainability.

Activity 3.1 Exploring Characteristics and Economic Importance of Tilapia Objective: Discuss the characteristics and economic importance of Tilapia.

Materials

• Pictures or videos of Tilapia

• Diagrams of Tilapia’s body structure

• Large plain cards and markers

• Handouts with guiding questions

• Scenarios related to Tilapia farming.

Tilapia Farming in Ghana

Tilapia farming in Ghana is important for the economy and food supply. Kwaku Avitor’s farm is in the Volta Region of Ghana. His farm sits on a 15-hectare land, dealing in freshwater Tilapia farming. The farm uses water from nearby lakes and rivers. He and his worker frequently check the water quality (like temperature and oxygen levels) to keep the fish healthy. The farm uses Nile tilapia, which grow quickly and adapt well to local conditions with about 6,000 fish placed in each hectare to ensure enough space for healthy growth. The fish eat a mix of local ingredients (e.g.

plant parts, organic waste, food scraps from homes etc.) and commercial feed for good growth. They are fed twice a day, with careful monitoring of how much they eat. They regularly check the fish health to spot any problems early. Vaccines and approved medicines are used to treat common fish diseases. Diseases like ‘Tilapia-lake-virus’ can cause high fish death rates. Changes in water quality and temperature can also affect fish growth. Due to the poor roads and competition from imported fish, Mr Avitor at times struggles to sell his fish. He recently had support from an export company that has promised to buy his fish on a regular basis. Since Mr Avitor started his fish farm, he has employed five men from his village. The fish not sold after harvesting are dried by the wives of his workers and sold in the local market as koobi. Tilapia farming in Ghana has many benefits for the economy and nutrition. While there are challenges, such as managing diseases and accessing markets, better practices can help improve the success of tilapia farming in the country.

Instructions

1. Consider the scenario provided, discuss and write down on your large plain card:

a. the features of Tilapia, such as its habitat, diet and adaptations.

b. how Tilapia is farmed.

c. its economic benefits

d. challenges the farmers face.

2. Think about what you have learned about tilapia and share your knowledge with the class.

3. Share with the class how you will apply this knowledge in your daily life and in future.

Characteristic Features of Toad

1. Toads have a compact, rounded body shape.

2. The skin is dry, rough and warty with small bumps and ridges. The nature of the skin helps it conserve water.

3. On both sides of the head is a pair of prominent, bulging and golden or copper-coloured eyes which boost its vision and ability to spot predators. Behind the pair of eyes are a pair of visible circular membranes, called the tympanic membrane (eardrum), that detect sound vibrations.

4. The legs are relatively short compared to the body, which ends in webbed digits for swimming in water. The two pairs of limbs, i.e. fore and hind limbs, are for movement.

Figure 3.4: External features of the common African toad Some life processes of the toad Nutrition Toads are carnivorous, with their nutrition consisting mainly of insects, invertebrates like worms, snails and small arthropods like spiders and centipedes. They have no teeth. They use their long sticky tongues to catch prey and swallow it whole.

Excretion The primary waste product of toads is urea, which is excreted through their kidneys. Urea is a nitrogenous waste that is produced from the breakdown of proteins. The urea is passed out in a rather concentrated urine because much of the water is reabsorbed. Additionally, excretion of carbon dioxide occurs through the lungs, the mouth and the skin by diffusion.

Movement Toads are known for their distinctive movement patterns, which include hopping or leaping, crawling and swimming.

1. They usually use their powerful hind legs to hop short or long distances. As the toad prepares to hop, its limb muscles and tendons store elastic energy.

2. The hind limbs rapidly extend, releasing the stored energy and propelling the toad into the air.

3. The toad lands on its front legs, which absorb the impact or shock and help to stabilise the body.

4. When in water, toads move by swimming. This is done using the webbed digits of the hind legs to paddle through the water while the fore limbs are used for steering.

Reproduction The breeding season of Sclerophrys regularis usually occurs in the rainy period. During this time, males start croaking to attract females. Once a female responds, the male climbs onto her back and clasps her with its forelimbs, a mating position known as amplexus.

This posture ensures the male fertilises the eggs as the female lays them.

Females deposit eggs in shallow water bodies like ponds or temporary pools. The eggs are released in long strands, with their number and pattern influenced by environmental conditions. As the female lays the eggs, the male simultaneously releases sperm over them, permitting external fertilisation.

The fertilised eggs develop into embryos and hatch within 3 to 14 days, depending on temperature and water quality. The hatched larvae, called tadpoles, are fully aquatic, equipped with gills and a tail for swimming.

Within several weeks or months, the tadpoles undergo metamorphosis where they gradually develop legs, lungs and lose their tails, moving from aquatic life to life on land.

Once this transformation is complete, the young toads leave the water and begin their terrestrial life.

Sclerophrys regularis typically reaches reproductive maturity within 2 to 3 years, and the life cycle starts once again.

Figure 3.5: Reproduction in Toads

Economic importance of the toad

1. Frogs and toads help show how healthy an ecosystem is. Their presence or absence can indicate environmental changes, which help with conservation and land management.

2. They help control insect populations, including pests that harm crops. This benefits farmers by reducing the need for chemical pesticides.

3. Some frog species produce skin secretions that are being studied for their potential health benefits, like fighting infections and relieving pain.

4. Certain frogs and toads are popular as exotic pets because of their colourful appearance, which supports local economies through breeding and sales.

5. Frogs and toads are important in many cultures and stories, often symbolising fertility and change.

6. They attract nature lovers and researchers, helping to support ecotourism that brings money to local communities.

7. Their unique features make them valuable for scientific research, aiding educational programs in biology and environmental science.

8. In some cultures, frog legs are considered a tasty dish, providing protein and income for local people.

Activity 3.2 “Frog and Toad Explorers” Objective: Explore and discuss the characteristic features of frogs and toads and their economic importance.

Materials

• Pictures or models of toads or frogs (station 1)

• Information on toad habitat and diet (station 2)

• Information on the economic importance of toads (station 3)

• White sheet of paper

• Markers or pens

• Guiding questions printouts (optional) Instructions

1. Team up with two of your peers and visit each of the stations or themes

2. At each station, discuss with your peers and answer these questions.

a. What are the characteristic features of toads?

b. How do toads contribute to ecosystem balance?

c. How does the toad’s presence benefit humans or agriculture?

3. Note down all your answers on your white sheet of paper.

4. After rotation, share your insights with other groups in your class.

Characteristic Features of the Common Wall Gecko

The Common wall gecko, belonging to the Hemidactylus species, is a small lizard frequently seen on walls in urban areas, especially in warm climates. It coexists with humans and feeds on insects, spiders, and other small invertebrates. This reptile can grow up to 15 cm in length and is commonly found in rocky terrains, cliffs, rock fields, construction sites, ruins, building walls, and even inside homes. It is completely harmless and non-poisonous to humans. Primarily nocturnal, the wall gecko is known for its remarkable ability to climb vertical surfaces and ceilings.

1. Its body is robust with a flat head and large, bulging eyes that lack eyelids.

2. The skin is scaly and rugged, typically brownish-grey or brown with varying spots. Its colouration can shift in intensity depending on the lighting, helping it blend seamlessly into its surroundings.

3. One of its most distinctive features is its toes, which are equipped with specialised adhesive pads that allow it to grip and scale smooth surfaces.

4. The gecko has a detachable tail, which it can shed as a defence mechanism when threatened.

Figure 3.6: Wall gecko Figure 3.7: Drawing showing external features of the Wall gecko The Life Processes of the Wall Gecko Nutrition Wall geckos are carnivorous insectivores that forage individually during warmer months.

They feed on a variety of insects and small invertebrates. Most geckos hunt and feed during the night; they are often seen hunting nocturnal insects near artificial light sources such as streetlights and those in homes.

Excretion Like most reptiles, wall geckos excrete nitrogenous waste in the form of uric acid, which conserves water more effectively than ammonia or urea. This uric acid is sometimes expelled along with a small amount of urine through the cloaca, a shared opening for the digestive, urinary and reproductive systems. Through this single opening, wall geckos eliminate faeces, urine and reproductive cells (sperm or eggs).

Movement Wall geckos possess strong limb and trunk muscles that enable them to exert force against vertical surfaces. Their flexible bodies allow precise control of limb movements for efficient climbing. One important feature of the wall gecko is their special toe pads. These pads have millions of tiny hair-like structures called setae. These setae help the gecko stick to surfaces by creating a strong adhesive effect. This stickiness comes from very small forces called van der Waals interactions, which happen when molecules are extremely close to each other. This adaptation allows geckos to climb and hold onto various surfaces easily.

Their tails also play a crucial role in stabilising and controlling movement, especially during landings after a fall.

Reproduction In warmer climates, wall geckos can reproduce all year round. During mating, the male grips the female’s neck with his jaws and wraps his tail around hers, lining up their cloaca for intercourse. After mating, the female lays one or two eggs in a concealed location such as cracks, crevices, beneath rocks or corners of homes. The incubation period lasts between 30 and 50 days, depending on environmental conditions like temperature, humidity and oxygen levels. Hatchlings emerge at less than 5 cm in length and are fully independent from birth. They grow rapidly, reaching sexual maturity within 6 to 12 months.

Economic Importance of the Wall Gecko

Biological Pest Control

1. Wall geckos play a vital role in natural pest management. A single gecko can eat 50 to 100 insects per night, including mosquitoes, flies, cockroaches and termites. This reduces how much chemical pesticides are used and therefore lowers household pest control costs.

2. By feeding on vector mosquitoes that transmit, e.g. malaria and dengue parasites, wall geckos indirectly reduce healthcare expenses and productivity losses. In Ghana and other tropical regions, this ecosystem service holds substantial economic value.

3. In rural farm structures, geckos help protect stored grains and produce from insect damage, reducing post-harvest losses in traditional storage systems.

Research and Biotechnology

The gecko’s extraordinary climbing ability has inspired biomimetic innovations worth millions in research and development. Gecko-inspired adhesives are being explored for use in the following:

a. Medical devices and bandages

b. Robotics and climbing technologies

c. Industrial materials handling

d. Space technology applications Cultural and Tourism Value

1. Wall geckos play a role in boosting biodiversity tourism, particularly in tropical areas.

This means that tourists are often interested in seeing these unique creatures as part of their experience in nature.

2. In many cultures, including in Ghana, wall geckos are viewed as helpful companions around the house. People appreciate them because they eat pests like insects.

Additionally, these geckos are part of local traditions and stories, making them a significant part of the culture.

Structural and Food Contamination

Gecko droppings can pollute food and water, so it’s important to keep storage areas clean. If there are a lot of geckos, you might need to clean walls and ceilings to prevent contamination. However, the costs of cleaning are usually small compared to the benefits of having geckos around, since they help control pests like insects.

Invasive Species Impacts

When geckos are introduced to non-native environments, some species may become invasive and displace local fauna and disrupt ecosystems. In such cases, control programs may be necessary, and this requires financial investment and ecological management.

Characteristic Features of the Domestic Fowl

The domestic fowl (Gallus domesticus) is a warm-blooded (homoiothermic) animal, meaning it maintains a constant internal body temperature regardless of external environmental conditions.

The body of the domestic fowl is divided into three main parts: the head, trunk and tail.

The head is small and rounded in shape

a. It features a skull that extends into two strong, pointed, horny structures known as the beak.

b. Has a pair of slit-like nostrils located on the beak.

c. Includes a pair of eyes with eyelids and a nictitating membrane (a transparent third eyelid).

d. Has ear openings, located behind each eye and are concealed by feathers.

e. bears a red, fleshy structure called the comb and beneath the beak hang a pair of fleshy lobes known as wattles. The comb and wattles are more prominent in males than in females.

f. is covered with feathers, except for the beak, comb and wattles.

Trunk and Limbs

The trunk supports both forelimbs and hindlimbs

a. The forelimbs are modified into wings

b. The legs and digits are covered with overlapping scales

c. Each leg has four digits ending in sharp, curved claws, three of which point forward and one backwards.

Tail

a. The tail is short and covered with long, strong quill feathers (also known as flight feathers)

b. At the base of the tail is the preen gland (also called the oil gland), which secretes oil used for preening, i.e. a grooming behaviour that keeps feathers glossy and waterproof.

Figure 3.8: External features of the domestic fowl, Gallus domesticus Selected Life Processes of the Domestic Fowl Nutrition The domestic fowl is omnivorous, feeding on a variety of food sources, including insects, worms and plant materials such as seeds and leaves. It uses its sharp, strong claws to scratch the ground in search of food, which is then picked up using its sharp, pointed beak.

The Digestive Process

a. The food is swallowed and passes through the oesophagus into the crop, where it is temporarily stored.

b. From the crop, the food moves into the proventriculus (the first part of the stomach), where digestive juices are secreted to begin chemical digestion.

c. The partially digested food then enters the gizzard (the second part of the stomach), where churning (mixing of food with small stones and digestive juices) and mechanical breakdown occur.

d. The presence of small, fine stones in the gizzard helps grind the food mechanically.

e. The food then moves into the intestine, where further digestion and nutrient absorption take place.

f. The caeca absorb water from the remaining food material.

g. The rectum transfers undigested food into the caeca, and it is finally eliminated as faeces through the cloaca

Figure 3.9: Digestive system of a Domestic fowl Excretion Excretion in domestic fowl involves the removal of waste products primarily through droppings. Unlike mammals, birds do not produce urea as the main nitrogenous waste.

Instead, their kidneys filter waste and produce uric acid directly. This uric acid is in a thick, pasty form with very low water content and is excreted along with faeces and appears as a whitish or cream-coloured bit on the faeces.

Movement Bird flight can be categorised into flapping, gliding or soaring. Several adaptations enable the domestic fowl to fly, even though it is not a strong flyer.

1. Large wing feathers provide a broad surface area for lift

2. Streamlined body shape reduces air resistance during flight

3. Wing and tail feather tips assist in steering

4. Large pectoral muscles depress the wings during flapping

5. A keel-like extension of the breastbone (sternum) serves as an anchor for these powerful muscles

6. A rigid skeleton offers a firm framework for muscle attachment

7. Hollow bones reduce overall body weight

8. The tail stabilises the bird in flight and aids in braking and landing

9. Eyes positioned on the sides of the head grant the bird wide and acute vision Reproduction Female domestic fowls, called hens, begin laying eggs at around six months of age. During courtship, the male (rooster or cockerel) performs a ‘circle dance’, lowers one wing and displays his colourful feathers to attract the female.

1. The male mounts the female, positions their reproductive openings together to transfer sperm into her oviduct, where internal fertilisation occurs.

2. As the fertilised egg travels down the oviduct, it becomes encased in albumen and a shell and is eventually laid in a nest.

3. Typically, one egg is laid per day, and incubation begins only after the full clutch has been laid.

4. The hen incubates the eggs, maintaining a temperature close to her body temperature by pressing them against her body to keep them warm and prevent water loss.

5. The embryo develops as its cells divide to form tissues and organs.

6. The yolk provides nutrients, while the albumen supplies both food and water.

7. The eggshell and membranes are permeable to air, allowing oxygen to diffuse in and be absorbed by capillaries over the yolk and the allantois.

8. Carbon dioxide diffuses out through the shell.

9. Once fully developed, after about three weeks, the eggs hatch (the chicks break out using their beaks).

10. Covered in down feathers, the chicks are mobile shortly after hatching but remain close to the mother hen.

11. The mother hen shelters them with her body and wings, protecting them from predators like cats and hawks.

The reproductive process in chickens is especially notable for its role in egg production, which is a key aspect of their economic and agricultural value.

Figure 3.10: Longitudinal section through the hen’s egg before and during incubation Function of the Parts of an Egg

a. Amnion: a fluid-filled sac that suspends and protects the developing embryo.

b. Allantois: stores excretory waste and transports oxygen to the embryo through its extensive network of blood vessels.

c. Yolk Sac: shrinks as the embryo consumes its food reserve and is absorbed into the body at hatching.

d. Yolk: supplies proteins and lipids (fats) essential for the embryo’s development.

e. Albumen: provides proteins and water to support the growth of the embryo.

f. Chalaza: a twisted strand of dense albumen that anchors the yolk in place.

g. Shell and Egg Membrane: permeable to air and serves as a protective barrier for the embryo.

Economic Importance of the Domestic Fowl

_(The) _(domestic) _(fowl) (Gallus domesticus) is among the most economically valuable domesticated animals globally. Its significance spans food production, employment, agricultural sustainability, cultural practices and emerging opportunities in value-added products and environmental services. The economic importance of the domestic fowl includes, but is not limited to:

Food Production

1. Chicken meat is the second most consumed meat worldwide, offering high-quality protein and essential micronutrients such as B vitamins, iron, and zinc.

2. Eggs are a source of complete protein, essential fatty acids and vitamins A, D, E, and B-complex, along with minerals like iron and phosphorus.

Employment and Income Generation

1. Large-scale poultry enterprises create jobs across the value chain: from farm labour to processing and distribution.

2. Small-scale poultry keeping requires low initial investment and provides supplemental income for rural families.

3. Poultry farming supports employment in:

a. Feed production

b. Veterinary services

c. Equipment manufacturing

d. Transportation

e. Slaughterhouses

f. Egg processing

g. Cold storage

h. Retail and marketing Integrated Agricultural Systems

1. Chicken manure is a rich fertiliser for crop production and contains approximately 4% nitrogen, 2% phosphorus and 2% potassium.

2. Free-range chickens help control pests by consuming insects and weed seeds.

3. Crop residues serve as feed for chickens, while poultry manure enriches soil, creating a cyclic farming system that reduces reliance on synthetic fertilisers and pesticides.

By -Products

1. Feathers are used in bedding and clothing for insulation.

2. Droppings are processed into organic manure.

3. Eggshells are utilised in calcium supplements, crafts and soil amendments.

Cultural and Social Importance

1. Domestic fowl play a role in traditional rituals and religious ceremonies across various Ghanaian cultures.

2. Live chickens are commonly given as gifts during major life events such as weddings, funerals and childbirth.

3. Chicken dishes are served to honoured guests as a gesture of respect and goodwill.

Activity 3.3 Create a Mind Map – Life Cycle of Wall Gecko and Domestic Fowl Objective: Create a comparative mind map that summarises the life cycles of the wall gecko and the domestic fowl, highlighting key stages, processes, and adaptations.

Materials Needed

• A3 or A4 sheets

• Coloured pencils or markers

• Ruler (optional)

• Reference notes or textbooks Instructions for Learners

1. At the centre of your page, write: “Life Cycle of Wall Gecko and Domestic Fowl”

2. From the centre, draw two large branches (lines):

a. Label one Wall Gecko

b. Label the other Domestic Fowl

3. Under each main branch, include the following sub-branches.

a. Reproduction: Describe how each animal mates and lays eggs

b. Development: Show how the young grow and mature

c. Adaptations: Include special features that help them survive (e.g., tail use, feathers)

d. Parental Care: Outline differences in the care of the young

4. Use Visuals and Colour

a. Use colours to make your mind map clear and attractive

b. Add simple drawings or icons like eggs, hatchlings or adult animals

c. Use short phrases or keywords instead of long sentences

5. As you build your mind map, think about:

a. What is similar between the wall gecko and the domestic fowl?

b. What is different?

6. Be ready to present your mind map to the class and explain your ideas.