Exam 19: Ecosystem Essentials

Species extinctions have occurred throughout Earth's history,so the recent loss of species is likely something of little concern.

Which is involved in photosynthesis?

Using outside forces,describe the limiting factor of an organism and how it affects this organisms distribution.

Lichen,which is a composite organism consisting of an alga and fungus,is an example of mutualism.

In coral reefs,clownfish live unharmed among the poisonous tentacles of sea anemones.The sea anemones protect the clownfish from predation,while the clownfish scare off predators,such as butterfly fish,which would otherwise eat the anemones.The clownfish may also provide important nutrients to the anemones.This is an example of which symbiotic relationship?

As energy moves through trophic levels it increases from lower to higher levels.

Which of the following is a biotic component of an ecosystem?

Which of the following is an abiotic component of an ecosystem?

A study of the spatial distribution of the coast redwood (Sequoia sempervirens)and the environmental factors that control that distribution would be an example of a topic studied in which of the following?

Of the total energy intercepted at the surface of Earth and available for work,only about how much is actually fixed by photosynthesis?

Continental drift separating a once continuous population is an example of which process?

Which embodies the origin of Earth's biological diversity?

Primary succession is more common than secondary succession.

If a lava flow completely denudes a mountain,leaving only bare rock,what type of succession will follow?

Approximately what percentage of plant and animal species has been classified overall?

Mistletoe (Phoradendron)infest many taxa of plants,often causing the branches of the host species to become swollen and distorted and making the trees more susceptible to insect infestations.This is an example of which symbiotic relationship?

Which refers to the biotic and abiotic characteristics in the environment that determine species distribution?

In which of the following areas would one tend to find the highest net primary productivity?

In food webs,toxic chemicals tend to accumulate and concentrate most in which level?

Altitudinal community assemblages at a constant latitude are often similar to latitudinal community assemblages at a constant elevation.