Life Sciences - Term 1 - Week 7

Ecosystems consist of biotic (living) and abiotic (non-living) components that interact with each other. Biotic components include plants, animals, fungi, and microorganisms, while abiotic components encompass sunlight, water, soil, and climate. These components work together to create a balanced environment where energy flows and nutrients cycle. For instance, plants convert sunlight into energy through photosynthesis, which is then transferred to herbivores and subsequently to carnivores, illustrating the flow of energy within an ecosystem.

Biodiversity refers to the variety of life forms within a given ecosystem, including the diversity of species, genetic variation, and ecosystem diversity. High biodiversity contributes to ecosystem resilience, allowing it to withstand environmental changes and disturbances. It also provides essential services such as pollination, nutrient cycling, and climate regulation. However, biodiversity is threatened by factors such as habitat destruction, pollution, climate change, and invasive species, leading to a decline in ecosystem health and function.

Consider a grassland ecosystem. The primary producers, such as grasses, convert sunlight into energy. Herbivores like rabbits consume the grasses, transferring energy to the next trophic level. Carnivores, such as foxes, then prey on the rabbits. This example illustrates the concept of trophic levels and energy transfer, where approximately 90% of energy is lost at each level due to metabolic processes, leaving only about 10% to be passed on.

In groups, students will identify and categorize the components of a local ecosystem. They will list biotic factors such as plants and animals, and abiotic factors like soil and water. Each group will present their findings, discussing how these components interact and contribute to the overall health of the ecosystem. This activity encourages collaboration and reinforces the understanding of ecosystem dynamics.

Students will choose a specific ecosystem (e.g., rainforest, desert, coral reef) and conduct research on its biodiversity. They will prepare a report that includes the types of species found, the importance of these species to the ecosystem, and the threats faced by this ecosystem. This project will enhance their research skills and deepen their understanding of the relationship between biodiversity and ecosystem health.

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

Answer: Biotic and abiotic

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

• Increased vulnerability to diseases
• Enhanced ecosystem resilience
• Reduced food security
• Higher extinction rates

Answer: Enhanced ecosystem resilience

Biodiversity contributes to the resilience of ecosystems, allowing them to adapt to changes.

Answer: Energy flows from producers to consumers through trophic levels, with energy loss at each level.

Energy is transferred from producers to herbivores and then to carnivores, with energy loss due to metabolic processes.

• Increased genetic variation
• Habitat destruction
• Natural disasters
• Climate stability

Answer: Habitat destruction

Habitat destruction is a significant threat that leads to loss of species and ecosystems.

Answer: Producers convert sunlight into energy through photosynthesis.

Producers, such as plants, are the foundation of the food web, providing energy for consumers.

• The number of individuals in a population
• The variety of life forms in an ecosystem
• The total biomass of an ecosystem
• The number of ecosystems in a region

Answer: The variety of life forms in an ecosystem

Biodiversity encompasses the variety of species, genetic diversity, and ecosystem diversity.