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?
9990 units
25
Which organism shown in the pyramid receives the highest percentage of energy from the Sun?
Buffalo grass (producer)
15
The organism shown is involved in which type of symbiosis?
parasitism
20
The organisms growing on the tree bark are ________. (producers, autotrophs, detritivores, decomposers, carnivores)
decomposers
15
In the energy pyramid, which level has the smallest number of organisms?
shark
15
What type of cycle is shown in the figure?
Phosphorus cycle
10
The group of animals in the figure is an example of which level of ecological organization?
population
20
Where is the biosphere in the figure? What is that layer called?
A - the earth's crust
20
Any close and long-lasting association among organisms of different species is called __________.
symbiosis
25
_____ is a simple model used to show how matter and energy move through an ecosystem.
Food chain
20
A(n)___________ is made up of interactions among the populations in a community and the community’s abiotic factors.
ecosystem
20
__________ are organisms that use energy from the sun or energy stored in chemical compounds to manufacture their own nutrients.
Autotrophs
20
____________ is the role or position a species has in its environment
Niche
15
In the food web shown, which of the organisms are herbivores?
rabbit, mouse, grasshopper
20
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)
A
15
Which of the following describes energy and matter in ecosystems?