Page 3

How is a population related to a community?

• Populations are isolated from communities.

• Populations interact to shape the ecological balance and diversity of a community.

• Populations have no effect on communities.

• Populations are larger than communities.

What is the 10% rule?

• 10% of energy is lost to the environment.

• 10% of energy is transferred from one trophic level to the next.

• 10% of organisms survive each year.

• 10% of species become extinct annually.

What processes does carbon cycle through the biosphere in?

• Photosynthesis, respiration, and decomposition.

• Evaporation, condensation, and precipitation.

• Erosion, sedimentation, and fossilization.

• Combustion, melting, and freezing.

Can a biomass and number pyramid have a smaller 1st trophic level than 2nd trophic level? Why?

• No, it is impossible due to energy constraints.

• Yes, it is possible due to environmental factors and human impacts.

• No, because the 1st level always has more organisms.

• Yes, because the 2nd level always consumes more.

How can a predator increase the numbers of certain species in its habitat?

• By consuming all the prey.

• By controlling the population of their competitors.

• By migrating to a different habitat.

• By increasing the food supply.