Life Sciences - Term 4 - Week 7

An ecosystem is a community of living organisms interacting with their physical environment. It includes both biotic factors, such as plants and animals, and abiotic factors, such as water, soil, and climate. Ecosystems can vary in size and complexity, from a small pond to a vast forest. Each ecosystem has its unique characteristics and functions, which are crucial for maintaining ecological balance.

Biodiversity refers to the variety of life forms in a given ecosystem, including the diversity of species, genetic variation, and the variety of ecosystems themselves. High biodiversity contributes to ecosystem resilience, allowing it to recover from disturbances and maintain functionality. It also provides essential services such as pollination, nutrient cycling, and climate regulation, which are vital for human survival.

In an ecosystem, organisms can be categorized into three main roles: producers, consumers, and decomposers. Producers, such as plants, convert sunlight into energy through photosynthesis. Consumers, including herbivores and carnivores, obtain energy by eating other organisms. Decomposers, like fungi and bacteria, break down dead organic matter, returning nutrients to the soil. Understanding these roles helps us appreciate the interconnectedness of life within ecosystems.

In groups, students will select a specific ecosystem (e.g., desert, rainforest, or coral reef) and identify its key components. They will list the producers, consumers, and decomposers found in that ecosystem, as well as any abiotic factors that influence it. Each group will present their findings to the class, highlighting the interdependence of the organisms within their chosen ecosystem.

Students will choose a local ecosystem and conduct research on its biodiversity. They will create a report that includes the types of organisms present, their roles, and the current threats to biodiversity in that ecosystem. Students will also suggest conservation strategies to protect the ecosystem. This project will help them apply their understanding of ecosystems and the importance of biodiversity in real-world contexts.

• A community of living organisms and their environment
• A type of plant
• A method of farming
• A climate zone

Answer: A community of living organisms and their environment

An ecosystem includes both living organisms and their physical environment, interacting as a system.

• Lion
• Grass
• Fungi
• Eagle

Answer: Grass

Producers, such as grass, create their own food through photosynthesis.

Answer: Biodiversity is the variety of life forms in an ecosystem, including species diversity, genetic diversity, and ecosystem diversity.

Biodiversity encompasses the range of different species and genetic variations within a given area.

• They produce energy
• They consume plants
• They break down dead matter
• They compete with other organisms

Answer: They break down dead matter

Decomposers recycle nutrients by breaking down dead organic material, enriching the soil.

• It increases competition
• It enhances ecosystem resilience
• It reduces species interactions
• It limits food sources

Answer: It enhances ecosystem resilience

High biodiversity allows ecosystems to recover from disturbances and maintain their functions.

Answer: Habitat destruction and pollution.

Habitat destruction and pollution are significant threats that can lead to loss of species and ecosystem degradation.

• Oak tree
• Rabbit
• Bacteria
• Sunflower