Topic Test Answers

Which ecosystem contains 32% of the world's producers?

An ecosystem has experienced a recent decrease in its plant populations. Which of the following is a possible reason for the decline?

Organisms do not adapt as a result of competition for resources.

Plants do not adapt to their environment because they do not compete for resources.

The proper order, from smallest to largest, for the levels of organization is _______.

Which of the following has the most biomass?

Which best describes the trophic level of an organism?

Producers are always the highest level in trophic pyramids. Please select the best answer from the choices provided

Which of the following does not occur in an aquatic ecosystem as a result of nutrient loading?

What types of organisms would you expect to see in an area that recently experienced a volcanic eruption?

Suppose a predator species became extinct over a short period of time. Which of the following would most likely happen to that predator’s prey species in the short term?

Organisms produce their own energy or provide energy for other organisms in a food chain. Yellowfin tuna, or Thunnus albacores, are large sport fish found in tropical and subtropical waters around the world. They typically school under objects such as boats or patches of driftwood for protection from predators. Schooling under these structures also provides yellowfin tuna with easy access to smaller fish that may be foraging for food. Photo by NOAA Which trophic level does yellowfin tuna fill in a food chain?

Which of the following is not an example of an abiotic factor?

Sunlight can be considered a food resource.

Organisms use different types of adaptations to aid in their survival.Some mushrooms are poisonous to organisms that eat them. What type of adaptation is this an example of?

Organisms use different types of adaptations to aid in their survival.Which of the following is an adaptation that would not help a lion to catch its prey?

Savanna is considered a transitional biome because it is intermediate between two _______.

The principal characteristic that determines whether an aquatic ecosystem is classified as marine or freshwater is _______.

If a predator is eliminated from an ecosystem its prey’s population will likely _______.

All animals are _______.