Life Sciences - Term 3 - Week 1

Ecosystems consist of biotic (living) and abiotic (non-living) components. Biotic factors include plants, animals, fungi, and microorganisms, while abiotic factors encompass sunlight, water, soil, and climate. These components interact in complex ways, forming a web of life that sustains the ecosystem. Understanding these interactions is crucial for studying environmental science and conservation.

In every ecosystem, energy flows through food chains, which illustrate how organisms are interconnected. Producers, such as plants, convert sunlight into energy through photosynthesis. Primary consumers, like herbivores, eat these plants, while secondary and tertiary consumers, such as carnivores, feed on other animals. Food webs are more complex networks that show multiple feeding relationships, highlighting the interdependence of species.

Biodiversity refers to the variety of life in an ecosystem, including the number of species and genetic diversity within those species. High biodiversity contributes to ecosystem resilience, allowing it to withstand environmental changes and disturbances. Conversely, ecosystems with low biodiversity are more vulnerable to collapse. Conservation efforts aim to protect biodiversity to ensure the health and sustainability of ecosystems.

Consider a simple food chain: Grass → Rabbit → Fox. In this chain, grass (a producer) converts sunlight into energy. The rabbit (a primary consumer) eats the grass, obtaining energy for growth and reproduction. The fox (a secondary consumer) preys on the rabbit, illustrating the flow of energy from one trophic level to another. This example highlights the roles of different organisms in an ecosystem.

In groups, students will observe a local ecosystem, such as a park or school garden. They will list biotic and abiotic factors they can identify. Each group will then present their findings, discussing how these components interact. This activity encourages collaboration and reinforces the concept of ecosystems as interconnected systems.

Students will choose an ecosystem (e.g., rainforest, desert, coral reef) and conduct research on its biodiversity. They will create a presentation that includes the types of organisms found, their roles in the ecosystem, and the importance of preserving that ecosystem. This project will help students apply their knowledge and develop research skills.

• Biotic and abiotic
• Producers and consumers
• Herbivores and carnivores
• Plants and animals

Answer: Biotic and abiotic

Ecosystems are made up of both living (biotic) and non-living (abiotic) components.

• Grass
• Rabbit
• Fox
• Decomposer

Answer: Rabbit

Primary consumers are herbivores that eat producers, such as rabbits eating grass.

Answer: Biodiversity refers to the variety of life in an ecosystem, including the number of species and genetic diversity.

Biodiversity is crucial for ecosystem stability and resilience.

• They produce energy
• They consume plants
• They break down dead matter
• They are top predators

Answer: They break down dead matter

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

• Trees
• Animals
• Water
• Bacteria

Answer: Water

Abiotic factors are non-living components of an ecosystem, such as water, sunlight, and soil.

Answer: Biodiversity is important because it enhances ecosystem resilience and stability, allowing it to adapt to changes.

High biodiversity helps ecosystems recover from disturbances and maintain balance.

• Energy flow
• Population size
• Species diversity
• Habitat range

Answer: Energy flow

Arrows in a food web indicate the direction of energy transfer from one organism to another.