Life Sciences - Term 2 - Week 3

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 and complexity, from a small pond to a vast forest. Each ecosystem has its own unique characteristics and plays a crucial role in maintaining the balance of nature.

Biodiversity refers to the variety of life in a particular habitat or ecosystem. It includes the diversity of species, genetic diversity, and ecosystem diversity. High biodiversity is essential for ecosystem resilience, providing stability and the ability to recover from disturbances. It also contributes to ecosystem services such as pollination, nutrient cycling, and climate regulation. However, biodiversity is threatened by factors such as habitat destruction, pollution, and climate change.

In an ecosystem, organisms can be classified into three main roles: producers, consumers, and decomposers. Producers, like plants, convert sunlight into energy through photosynthesis. Consumers, such as animals, rely on producers for food. Decomposers, including fungi and bacteria, break down dead organic matter, returning nutrients to the soil. For example, in a forest ecosystem, trees (producers) provide food for deer (primary consumers), while fungi (decomposers) help recycle nutrients back into the soil.

In groups, students will identify various components of a local ecosystem. They will categorize organisms as producers, consumers, or decomposers and discuss their interrelationships. For instance, students may observe a garden and note how plants (producers) support insects (primary consumers) and how earthworms (decomposers) enrich the soil. Each group will present their findings to the class, fostering discussion on the importance of each role.

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, their roles, and the threats to that ecosystem's biodiversity. The project will culminate in a presentation where students will share their findings and propose conservation strategies to protect their chosen ecosystem.

• 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 encompasses both living organisms and their physical surroundings, highlighting the interactions between them.

• Deer
• Mushrooms
• Grass
• Wolves

Answer: Grass

Producers, such as grass, convert sunlight into energy through photosynthesis, forming the base of the food chain.

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

Biodiversity includes the diversity of species, genetic diversity, and ecosystem diversity, all of which are crucial for ecosystem health.

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

Answer: They break down dead matter

Decomposers recycle nutrients back into the ecosystem by breaking down dead organic material.

Answer: Habitat destruction and pollution.

Habitat destruction and pollution are significant threats that reduce the variety of life and disrupt ecosystems.

• Grass
• Rabbit
• Eagle
• Fungi

Answer: Rabbit

Primary consumers, like rabbits, feed on producers such as grass.

Answer: Biodiversity contributes to ecosystem resilience and stability, providing essential services like pollination and nutrient cycling.

High biodiversity allows ecosystems to withstand changes and recover from disturbances, ensuring their long-term health.