Life Sciences - Term 1 - Week 9

Ecosystems consist of biotic (living) and abiotic (non-living) components. Biotic components include plants, animals, fungi, and microorganisms, while abiotic components encompass elements such as soil, water, air, and sunlight. These components interact in complex ways, forming food webs and nutrient cycles that sustain life. Understanding these interactions is crucial for studying ecological balance and the health of our environment.

Biodiversity refers to the variety of life forms within a given ecosystem. It is essential for ecosystem resilience, providing stability and the ability to recover from disturbances. High biodiversity ensures that ecosystems can withstand environmental changes and continue to provide essential services such as pollination, water purification, and climate regulation. Loss of biodiversity can lead to ecosystem collapse and reduced quality of life for all organisms, including humans.

Consider a simple food web in a forest ecosystem. It includes producers like trees and shrubs, primary consumers like deer and rabbits, and secondary consumers such as foxes and hawks. If a disease affects the deer population, this will impact the foxes that rely on them for food. By analyzing this food web, we can see how interconnected species are and how changes in one population can affect others, illustrating the delicate balance within ecosystems.

In groups, students will select a local ecosystem (e.g., a pond, forest, or grassland) and identify its biotic and abiotic components. They will create a chart listing these components and describe their roles within the ecosystem. This activity will help students understand the complexity of ecosystems and the importance of each component in maintaining ecological balance.

Students will choose an endangered species and research its role in its ecosystem, the threats it faces, and conservation efforts in place. They will prepare a presentation to share their findings with the class. This project encourages students to explore real-world applications of biodiversity concepts and understand the importance of protecting vulnerable species.

• 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.

• It increases competition
• It ensures ecosystem stability
• It reduces species interactions
• It limits resource availability

Answer: It ensures ecosystem stability

Biodiversity contributes to the resilience of ecosystems, allowing them to recover from disturbances.

Answer: Biodiversity refers to the variety of life forms in a particular habitat or ecosystem.

This definition captures the essence of biodiversity, highlighting the variety of species present.

• Grass
• Deer
• Fox
• Hawk

Answer: Deer

Primary consumers are herbivores that feed on producers like plants.

Answer: Human activities such as deforestation, pollution, and urbanization lead to habitat loss and species extinction.

These activities disrupt ecosystems and reduce the variety of life forms.

• A linear sequence of energy transfer
• A complex network of feeding relationships
• A list of all species in an ecosystem
• A diagram of abiotic factors

Answer: A complex network of feeding relationships

A food web illustrates how different species are interconnected through feeding relationships.

• Bacteria
• Sunlight