Ecosystem Pyramids

What is a food web?

• shows a single feeding relationship in an ecosystem

• shows all feeding relationships in an ecosystem

• shows all feeding relationships in a population

• shows all feeding relationships in a species

What is a keystone species?

• maintains the balance in an ecosystem

• maintains the balance and diversity in an ecosystem

• maintains the diversity in an ecosystem

• maintains the hierarchy in an ecosystem

What is the shape of a pyramid of energy?

• square

• diamond

• triangle

• rectangle

What do the bar represent in a pyramid of numbers?

• represent the number of organisms in an ecosystem

• represent the number of organisms in a population

• represent the number of organisms in a feeding level

• represent the number of organisms in a community

What feeding level is at the bottom of a pyramid of numbers and pyramid of energy?

• producer

• primary consumer

• secondary consumer

• tertiary consumer

How is energy LOST in an ecosystem?

• as matter

• as heat

• as matter and heat

How much energy is lost at each trophic level?

• 90%

• 9%

• 0.9%

• 10%

How much energy is available between trophic levels?

• 90%

• 10%

• 1%

• 0.1%

What processes reduce energy transfer between trophic levels?

• respiration

• respiration + dead organisms

• respiration + death + defecation

• respiration + death + defecation + working out

What are there a limited number of trophic levels in an ecosystem?

• due to large energy losses between trophic levels

• due to large energy transfers between trophic levels

• due to small energy transfers between ecosystems

• due to large energy losses between ecosystems