Question 1

What is the organisation of an ecosystem in AQA GCSE Biology?

Accepted Answer

In AQA GCSE Biology, the organisation of an ecosystem refers to the hierarchical structure that includes individual organisms, populations, communities, and ecosystems. Each level represents a different scale of interaction and complexity, from single organisms to entire ecosystems comprising various species and their physical environment.

Question 2

How do biotic and abiotic factors influence ecosystems?

Accepted Answer

Biotic factors, such as plants, animals, and microorganisms, interact with each other and influence the ecosystem's structure and function. Abiotic factors, including sunlight, temperature, and water, affect the living conditions and survival of organisms. Together, these factors determine the distribution and abundance of species within an ecosystem.

Question 3

What role do producers, consumers, and decomposers play in an ecosystem?

Accepted Answer

Producers, like plants and algae, convert sunlight into energy through photosynthesis, forming the base of the food chain. Consumers, such as herbivores, carnivores, and omnivores, obtain energy by eating other organisms. Decomposers, including fungi and bacteria, break down dead organic matter, recycling nutrients back into the ecosystem, which supports the growth of producers.

Question 4

Why is biodiversity important in an ecosystem?

Accepted Answer

Biodiversity is crucial because it enhances ecosystem resilience, productivity, and stability. A diverse range of species ensures that ecosystems can withstand environmental changes and disturbances. High biodiversity also supports ecosystem services, such as pollination, nutrient cycling, and climate regulation, which are vital for human survival.

Question 5

How do energy and nutrients flow through an ecosystem?

Accepted Answer

Energy flows through an ecosystem in a one-way stream, from the sun to producers and then to consumers. Nutrients, however, are recycled within the ecosystem. Decomposers play a key role in breaking down dead organisms, returning nutrients to the soil, which are then taken up by producers, continuing the cycle. This flow and recycling maintain ecosystem health and productivity.

Organisation of an Ecosystem

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