chapter 2 principles of ecology

A(n)___________ is made up of interactions among the populations in a community and the community’s abiotic factors.

Phosphorus is usually present in the form of _________ in soil and water.

Which organism shown in the pyramid receives the highest percentage of energy from the Sun?

Which of the following would most decrease the amount of carbon dioxide in the air?(A. a growing maple tree B. a running dog C. a person driving a car D. a burning forest)

Referring to the figure, suppose 10 000 units of energy are available at the level of the grasses. What is the total number of energy units lost by the time energy reaches the owl?

The symbiotic relationship occurs in lichens is _________.

____________ is the role or position a species has in its environment

In the food web shown, which of the organisms are herbivores?

The group of animals in the figure is an example of which level of ecological organization?

The organisms growing on the tree bark are ________. (producers, autotrophs, detritivores, decomposers, carnivores)

__________ are organisms that use energy from the sun or energy stored in chemical compounds to manufacture their own nutrients.

Where is the biosphere in the figure? What is that layer called?

In the energy pyramid, which level has the smallest number of organisms?

The organism shown is involved in which type of symbiosis?

_____ is a simple model used to show how matter and energy move through an ecosystem.

In the pyramid of energy, less energy is available in the second level because _____.

The amount of energy at each level of the energy pyramid is about ________% of what it was on the level before.

Which of the following describes energy and matter in ecosystems?

_________ is the process that happens when bacteria convert the nitrogen from air into more usable forms.

What type of cycle is shown in the figure?

When soil bacteria convert nitrogen compounds to nitrogen gas and back into the air, this process is called ________.

Any close and long-lasting association among organisms of different species is called __________.