GCSE Biology - Interdependence - Community and Competition #84

The video tutorial explains the relationships organisms have with each other and their environment, highlighting how changes in one part of an ecosystem can affect the whole. It introduces key ecological terms such as habitat, population, community, biotic and abiotic factors, and ecosystem. The video also covers the concept of competition for resources among organisms and the idea of interdependence, illustrated through food webs. Understanding these relationships helps predict the effects of changes within ecosystems.

What happens to an ecosystem if the population of a species, such as mice, decreases?

• Predators may have less food, and soil quality may decrease.

• The population of all species increases.

• The ecosystem remains unaffected.

• The ecosystem becomes more diverse.

Which term describes the place where an organism lives?

• Population

• Community

• Ecosystem

• Habitat

What are abiotic factors in an ecosystem?

• The variety of species

• The number of predators

• Non-living factors like temperature and soil pH

• Living factors like food availability

Why do organisms compete with each other in an ecosystem?

• To increase biodiversity

• Because resources are limited

• To establish dominance

• Because resources are unlimited

Which of the following is an example of competition between different species?

• A plant growing towards sunlight

• Lions and hyenas competing for a wildebeest

• A bird building a nest

• Two male deer fighting for a mate

What is interdependence in an ecosystem?

• The isolation of species from each other

• The reliance of species on non-living factors

• The competition between species for resources

• The dependence of all species on each other

If the mouse population increases, what is a likely consequence for the grass population?

• The grass population will become extinct.

• The grass population will decrease.

• The grass population will remain the same.

• The grass population will increase.