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Move from lesson study to exam practice in Life Sciences.
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 from a small pond to a vast forest, and they are characterized by the flow of energy and the cycling of nutrients.
Biodiversity refers to the variety of life in a particular habitat or ecosystem. It includes the diversity of species, genetic diversity within species, and the variety of ecosystems themselves. High biodiversity is crucial for ecosystem resilience, allowing ecosystems to adapt to changes and recover from disturbances.
In an ecosystem, organisms can be categorized into three main roles: producers, consumers, and decomposers. Producers, like plants, convert sunlight into energy through photosynthesis. Consumers, such as herbivores and carnivores, obtain energy by eating other organisms. Decomposers, like fungi and bacteria, break down dead organic matter, returning nutrients to the soil. This cycle is essential for maintaining the health of the ecosystem.
In groups, students will identify various components of a local ecosystem. Each group will choose a specific ecosystem (e.g., forest, wetland, urban area) and list the producers, consumers, and decomposers found there. They will also discuss how these components interact and the importance of each role in maintaining the ecosystem's health.
Students will select an endangered species and research its habitat, role in the ecosystem, and the factors contributing to its endangerment. They will prepare a short presentation to share their findings with the class, highlighting the importance of biodiversity and conservation efforts.
Answer: A community of living organisms and their environment
An ecosystem includes both the living organisms and their physical environment, interacting as a system.
Answer: Oak tree
Producers, such as plants, create their own food through photosynthesis.
Answer: Biodiversity is the variety of life in a particular habitat or ecosystem.
Biodiversity encompasses the diversity of species, genetic diversity, and ecosystem diversity.
Answer: They break down dead matter
Decomposers recycle nutrients back into the ecosystem by breaking down dead organic material.
Answer: It enhances ecosystem stability
High biodiversity allows ecosystems to be more resilient to changes and disturbances.
Answer: Habitat destruction and pollution.
Habitat destruction and pollution are significant threats that can lead to loss of species and reduced biodiversity.
Answer: Rabbit
Consumers are organisms that obtain energy by eating other organisms, such as rabbits that eat plants.
Answer: A trophic level refers to the position an organism occupies in a food chain.
Trophic levels indicate the flow of energy through an ecosystem, from producers to various levels of consumers.