Life Sciences - Term 3 - Week 4

An ecosystem consists of living organisms (biotic factors) and non-living elements (abiotic factors) that interact in a specific environment. Biotic factors include plants, animals, fungi, and microorganisms, while abiotic factors encompass sunlight, water, soil, and climate. These components work together to create a balanced environment where energy flows and nutrients cycle. For instance, plants convert sunlight into energy through photosynthesis, which is then transferred to herbivores and subsequently to carnivores, illustrating the flow of energy within the ecosystem.

Biodiversity refers to the variety of life forms within a given ecosystem, including the diversity of species, genetic variations, and ecosystem diversity. High biodiversity contributes to ecosystem resilience, allowing it to withstand environmental changes and disturbances. It also provides essential services such as pollination, nutrient cycling, and climate regulation. The loss of biodiversity can lead to ecosystem collapse, affecting food security and human health.

Consider a simple food chain: grass → rabbit → fox. In this chain, grass (producer) captures sunlight and converts it into energy. The rabbit (primary consumer) eats the grass, obtaining energy, and the fox (secondary consumer) preys on the rabbit. If the rabbit population decreases due to habitat destruction, the fox population will also decline due to lack of food. This example illustrates how changes in one component of an ecosystem can affect others.

In groups, students will identify and categorize various components of a local ecosystem. They will list biotic factors such as plants and animals, and abiotic factors like water and soil types. Each group will present their findings, discussing how these components interact. This activity will help students understand the complexity of ecosystems and the interdependence of their components.

Students will choose a specific human activity (e.g., deforestation, pollution, urbanization) and research its impact on local ecosystems and biodiversity. They will prepare a short report outlining the activity, its effects, and potential solutions to mitigate the damage. This task encourages critical thinking about human responsibility in environmental conservation.

• Biotic and abiotic factors
• Producers and consumers
• Herbivores and carnivores
• Plants and animals

Answer: Biotic and abiotic factors

Ecosystems are made up of living (biotic) and non-living (abiotic) components that interact with each other.

• Increased vulnerability to diseases
• Stability of ecosystems
• Reduction in food sources
• Higher extinction rates

Answer: Stability of ecosystems

Biodiversity contributes to the resilience and stability of ecosystems, allowing them to adapt to changes.

Answer: Biodiversity is the variety of life forms in a particular habitat or ecosystem.

This definition captures the essence of biodiversity, emphasizing the variety of species and genetic differences.

• A plant
• A herbivore
• A carnivore
• A decomposer

Answer: A herbivore

Primary consumers are organisms that eat producers (plants) to obtain energy.

Answer: Deforestation leads to habitat loss, which can result in species extinction and reduced biodiversity.

Habitat loss from deforestation disrupts ecosystems and can eliminate species that depend on those habitats.

• Trees
• Animals
• Water
• Bacteria

Answer: Water

Abiotic factors are non-living components of an ecosystem, such as water, soil, and climate.

• They produce energy
• They consume plants
• They break down dead matter