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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, like 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. High biodiversity contributes to ecosystem resilience, allowing it to recover from disturbances and maintain functionality. It also provides resources for food, medicine, and ecosystem services.
Consider a simple food chain: grass (producer) → rabbit (primary consumer) → fox (secondary consumer). In this example, energy flows from the grass to the rabbit when the rabbit eats the grass, and then to the fox when it eats the rabbit. This illustrates the concept of energy transfer within an ecosystem, highlighting the roles of different organisms.
In pairs, students will identify various organisms in a local ecosystem (e.g., a park or schoolyard) and classify them as producers, consumers, or decomposers. For example, students might note that a tree is a producer, a squirrel is a consumer, and fungi are decomposers. After classification, discuss how these roles contribute to the ecosystem's health.
Students will choose an ecosystem (e.g., rainforest, desert, coral reef) and conduct research on its biodiversity. They will create a poster that includes the types of organisms found in that ecosystem, their roles, and the importance of preserving that ecosystem. This project will help students understand the significance of biodiversity in maintaining ecological balance.
Answer: A community of living organisms and their environment
An ecosystem includes both biotic and abiotic components interacting with each other.
Answer: Grass
Producers are organisms that can make their own food through photosynthesis, like grass.
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 organic matter
Decomposers recycle nutrients back into the ecosystem by breaking down dead organisms.
Answer: Biodiversity is important because it enhances ecosystem resilience and stability.
High biodiversity allows ecosystems to recover from disturbances and maintain their functions.
Answer: Soil
Soil is an abiotic factor, while plants, animals, and bacteria are biotic factors.
Answer: Sunlight
Sunlight is the primary energy source for photosynthesis, which supports producers in ecosystems.
Answer: Grass → Rabbit → Fox
This food chain illustrates the flow of energy from a producer (grass) to a primary consumer (rabbit) and then to a secondary consumer (fox).