Life Sciences - Term 2 - Week 10

An ecosystem is a community of living organisms interacting with their physical environment. It includes biotic factors, such as plants, animals, and microorganisms, as well as abiotic factors like soil, water, 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 forms within a given ecosystem, including the diversity of species, genetic variations, and the ecosystems themselves. High biodiversity contributes to ecosystem resilience, allowing it to withstand environmental changes and disturbances. It also provides essential services such as food, clean water, and medicine, making it vital for human survival and well-being.

Consider a forest ecosystem. The producers, such as trees and plants, convert sunlight into energy through photosynthesis. Herbivores, like deer, consume these plants, while carnivores, such as wolves, prey on the herbivores. Decomposers, including fungi and bacteria, break down dead organic matter, returning nutrients to the soil. This example illustrates the flow of energy and nutrients within an ecosystem.

In pairs, students will select a local ecosystem (e.g., a park, river, or garden) and identify its components. They should list at least three producers, three consumers, and two decomposers found in that ecosystem. Afterward, each pair will share their findings with the class, discussing the interrelationships among the components.

Students will research a specific human activity (e.g., deforestation, pollution, urbanization) and its effects on biodiversity in a chosen ecosystem. They will write a short report (300-500 words) detailing the activity, its impact on species diversity, and potential solutions to mitigate these effects. Reports will be shared in small groups for peer feedback.

• To decompose organic matter
• To consume other organisms
• To convert sunlight into energy
• To compete for resources

Answer: To convert sunlight into energy

Producers, such as plants, use photosynthesis to convert sunlight into energy, forming the base of the food chain.

• Species diversity
• Genetic diversity
• Ecosystem diversity
• Climate diversity

Answer: Climate diversity

Climate diversity is not a component of biodiversity; biodiversity refers specifically to the variety of life forms.

Answer: Biodiversity is the variety of life forms within a given ecosystem, including species diversity, genetic diversity, and ecosystem diversity.

Biodiversity encompasses all living organisms and their interactions within ecosystems.

• Increased biodiversity
• Loss of species
• Improved ecosystem health
• Enhanced food production

Answer: Loss of species

Habitat destruction leads to the loss of species as their natural environments are altered or destroyed.

Answer: One way human activities impact biodiversity is through pollution, which can harm or kill species and disrupt ecosystems.

Pollution can lead to toxic environments that are uninhabitable for many organisms, reducing biodiversity.

• Grass
• Rabbit
• Fungi
• Eagle

Answer: Fungi

Fungi are decomposers that break down dead organic matter, returning nutrients to the soil.