Life Sciences - Term 4 - Week 1

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 from a small pond to a vast forest and can be classified into terrestrial and aquatic ecosystems. Understanding the components of an ecosystem helps us appreciate the complexity and interdependence of life.

Biodiversity refers to the variety of life in a particular habitat or ecosystem. It is crucial for ecosystem stability and resilience, providing essential services such as pollination, nutrient cycling, and climate regulation. High biodiversity enhances ecosystem productivity and allows for greater adaptability to environmental changes. Loss of biodiversity can lead to ecosystem degradation, affecting food security and human health.

Consider a forest ecosystem where trees provide shelter and food for various animal species. In turn, animals such as birds and insects help in pollinating plants. This interaction illustrates the concept of mutualism, where both species benefit. If a human activity, such as deforestation, occurs, it disrupts these interactions, leading to a decline in biodiversity and ecosystem health.

In groups, students will select a specific ecosystem (e.g., desert, rainforest, coral reef) and identify its biotic and abiotic components. They will create a chart that lists these components and describes their roles within the ecosystem. Afterward, each group will present their findings to the class, fostering discussion on the diversity of ecosystems and their functions.

Students will choose a local ecosystem and research how human activities have impacted its biodiversity. They will write a report detailing the changes observed, the species affected, and potential conservation strategies. This project will encourage students to connect theoretical knowledge with real-world applications and promote awareness of environmental issues.

• A group of similar species
• A community of living organisms and their environment
• A type of biome
• A collection of abiotic factors only

Answer: A community of living organisms and their environment

An ecosystem includes both biotic and abiotic components interacting in a specific environment.

• Soil
• Water
• Plants
• Sunlight

Answer: Plants

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

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

Biodiversity encompasses the different species, genetic variations, and ecosystems present in a given area.

• Increased ecosystem resilience
• Enhanced food security
• Ecosystem degradation
• Improved climate regulation

Answer: Ecosystem degradation

Decreased biodiversity can lead to weakened ecosystems, making them more vulnerable to disturbances.

• Recycling
• Deforestation
• Sustainable farming
• Conservation efforts

Answer: Deforestation

Deforestation removes habitats, leading to loss of species and reduced biodiversity.

Answer: Pollinators, such as bees and butterflies, help in the reproduction of flowering plants by transferring pollen, which is essential for fruit and seed production.

Pollinators are crucial for maintaining plant diversity and food production in ecosystems.

• One species benefits while the other is harmed.