Lesson 56: Ecological Pyramids

Select all answers below that can be represented in an ecological pyramid.

• number of individuals

• energy flow

• biomass

• color of indivduals

A(n) ________________ is also known as a producer.

A trophic level refers to a ________________ relationship.

• predator-prey

• reproductive

• feeding

• symbiotic

When describing ecological pyramids, biomass refers to -

• the amount of mass an individual possesses.

• the total density of organisms in a trophic level.

• the total mass of individuals in an ecosystem.

• the total dry mass of organisms in a trophic level.

If there are 10,000 kcal of energy in the first trophic level, then the fourth level will have about ___________ kcal.

• 10,000

• 1,000

• 100

• 10

Ultimately, the amount of energy passed from one trophic level to the next is ________.

• 10%

• 5%

• 50%

• 100%

Select all answer below that describe why each trophic level only passes on about 10% of its energy to next level.

• Not all organisms oin a trophic level are consumed.

• A consumer uses up most of the energy it consumes.

• Some energy is lost into the atmosphere is heat.

• A producer uses up most of the energy it produces.

A ____________ ____________ is a carnivore or an omnivore.

• autotroph

• primary consumer

• secondary consumer

• producer

A(n) ________________ is considered a primary consumer.

• herbivore

• carnivore

• producer

• omnivore

In a pyramid of numbers, the relative number of organisms at each trophic level usually ________________.

• increases

• remains constant

• decreases

• randomly changes