Ecology - Grade 8

Which of the following best describes a niche?

• the role that an organism plays within an ecosystem

• the amount of food that an organism can consume

• shows how energy is created through photosynthesis

• shows how energy is passed from one trophic level to another

Which abiotic factor is responsible for supplying an ecosystem with all of its food energy?

• Water

• Soil

• Sun

• Decomposer

Which best describes an ecosystem?

• Ecosystems are made up of all abiotic things in an area.

• Ecosystems are made of a group of organisms of one species.

• Ecosystems are made up of all biotic and abiotic factors that interact in an environment.

• Ecosystems are made up of many species interacting together.

How do populations differ from communities in an ecosystem?

• Populations and communities are the same.

• Populations consist of groups of the same species, whereas communities consist of groups of multiple species.

• Populations consist of groups of multiple species, whereas communities consist of groups of the same species.

• Populations consist of the biotic factors of an ecosystem, whereas communities consist of the abiotic factors in an ecosystem.

Which of the following best describes why an Ecologist would have concerns about an ecosystem with LOW Biodiversity?

• the ecosystem will have too many species

• the ecosystem will have too few organisms

• the ecosystem is more likely to survive when disruptions occur in the habitat

• the ecosystem is less likely to survive when disruptions occur in the habitat

Which of the following correctly organizes the vocabulary words in order from SMALLEST group to LARGEST group?

• Organism --> Ecosystem --> Community --> Population

• Population--> Community--> Ecosystem --> Organism

• Organism--> Population--> Ecosystem--> Communit

• Organism --> Population--> Community--> Ecosystem

What is the purpose of a food web?

• to show how biotic and abiotic factors impact an ecosystem

• to show one path that energy can take through an ecosystem

• to show all the paths that energy can take through an ecosystem

• to show the percentages of energy that transfer through the ecosystem

Which of these is true about SYMBIOTIC relationships?

• symbiosis always benefit both species

• competition and predation are examples of symbiotic relationship

• an ecosystem with low biodiversity has many symbiosis relationships

• symbiotic relationships exist between organisms of different species living closely together

Which of the following type of terms best describes the relationship between a dog and a tick?

• Parasitism because the tick feeds off of the dog

• Symbiosis because the tick and dog both live together in harmony

• Mutualism because both the tick and the dog benefit each other

• Commensalism because the tick benefits and the dog is unaffected

Which of the following statements best explains competition?

• both populations always decrease when competition exists between species

• both populations always increase when competition exists between species

• two species that have exactly the same niche support each other through competition

• two species that have exactly the same niche can't live in the same habitat without competition