Life Sciences - Term 3 - Week 8

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 water, soil, and climate. Ecosystems can vary in size and complexity, from a small pond to a vast forest. Understanding ecosystems is crucial for recognizing how organisms depend on each other and their environment.

Biodiversity refers to the variety of life in a particular habitat or ecosystem. It encompasses the diversity of species, genetic variations, and the variety of ecosystems themselves. High biodiversity contributes to ecosystem resilience, allowing it to withstand environmental changes and disturbances. It also provides resources for food, medicine, and ecosystem services such as pollination and water purification.

Consider a forest ecosystem. The biotic components include trees, shrubs, birds, insects, and mammals. The abiotic components include sunlight, temperature, soil, and water. Each component interacts with others; for example, trees provide shelter for birds, while birds help in seed dispersal. Understanding these interactions helps us appreciate the complexity of ecosystems.

In groups, students will select a local ecosystem, such as a park or riverbank, and identify its biotic and abiotic components. They will create a chart listing these components and discuss how they interact. Each group will present their findings to the class, highlighting the importance of biodiversity in their chosen ecosystem.

Students will choose a specific human activity (e.g., deforestation, pollution, urbanization) and research its effects on a particular ecosystem and its biodiversity. They will write a short report summarizing their findings and propose potential solutions to mitigate these impacts. This project will help students understand the direct consequences of human actions on the environment.

• Biotic and abiotic
• Flora and fauna
• Producers and consumers
• Herbivores and carnivores

Answer: Biotic and abiotic

Ecosystems consist of biotic (living) and abiotic (non-living) components that interact with each other.

• It increases competition
• It enhances ecosystem resilience
• It reduces species interactions
• It limits food sources

Answer: It enhances ecosystem resilience

Biodiversity allows ecosystems to adapt to changes and disturbances, maintaining balance and health.

Answer: Biodiversity is the variety of life forms in a particular habitat, including different species, genetic variations, and ecosystems.

This definition captures the essence of biodiversity and its various dimensions.

• Water
• Soil
• Sunlight
• Plants

Answer: Plants

Plants are living organisms and thus classified as biotic factors, while the others are abiotic.

Answer: Deforestation and pollution.

Both activities lead to habitat destruction and degradation, which threaten various species.

• Animals
• Plants
• Temperature
• Bacteria

Answer: Temperature

Temperature is a non-living component of the environment, making it an abiotic factor.

• By providing shade
• By producing oxygen
• By offering habitat for various species
• All of the above