Life Sciences - Term 1 - Week 10

An ecosystem is a community of living organisms interacting with their physical environment. It includes both biotic factors, such as plants, animals, and microorganisms, and abiotic factors, such as sunlight, water, and soil. Ecosystems can vary in size from a small pond to a vast forest, and they are crucial for maintaining the balance of life on Earth.

Biotic factors refer to the living components of an ecosystem, including all organisms that affect each other, such as predators, prey, and plants. Abiotic factors are the non-living components that influence the ecosystem, including temperature, water availability, and nutrients in the soil. Understanding the interplay between these factors is essential for studying how ecosystems function.

Consider a simple food chain: Grass → Grasshopper → Frog → Snake. In this chain, grass is the producer that converts sunlight into energy through photosynthesis. The grasshopper, a primary consumer, feeds on the grass. The frog, a secondary consumer, eats the grasshopper, and finally, the snake, a tertiary consumer, preys on the frog. This illustrates how energy flows through an ecosystem.

In groups, students will observe a local ecosystem, such as a school garden or park. They will identify at least three biotic and three abiotic factors present in that ecosystem. Each group will present their findings, discussing how these factors interact and contribute to the overall health of the ecosystem.

Students will choose an ecosystem (e.g., desert, rainforest, tundra) and create a poster that includes the following: a description of the ecosystem, its biotic and abiotic components, a food chain, and the importance of biodiversity within that ecosystem. This assignment will help reinforce their understanding of ecosystems and their complexity.

• A group of similar organisms
• A community of living organisms and their environment
• A type of biome
• A food chain

Answer: A community of living organisms and their environment

An ecosystem encompasses both the living organisms and the non-living components of their environment.

• Water
• Soil
• Plants
• Temperature

Answer: Plants

Biotic factors are the living components of an ecosystem, such as plants and animals.

Answer: Abiotic factors are the non-living components of an ecosystem. Examples include sunlight and water.

Abiotic factors are essential for the survival of biotic factors and influence ecosystem dynamics.

• They consume other organisms.
• They decompose organic matter.
• They convert sunlight into energy.
• They compete for resources.

Answer: They convert sunlight into energy.

Producers, such as plants, use photosynthesis to convert sunlight into energy, forming the base of the food chain.

Answer: Biodiversity is important because it enhances ecosystem resilience, provides a variety of resources, and supports ecosystem services.

High biodiversity contributes to the stability and productivity of ecosystems, allowing them to better withstand changes.

• Producers
• Consumers
• Decomposers
• Weather

Answer: Weather

Weather is an abiotic factor that affects ecosystems but is not a component of a food chain.