Eli Practice Test 2

What is the definition of an omnivore?

• An organism that eats only plants

• An organism that eats only animals

• An organism that eats both plants and animals

• An organism that eats decomposed material.

Fill in the blank: According to the 10% Rule, only ___% of energy is transferred from one trophic level to the next.

• 5

• 10

• 20

• 50

What is the significance of the arrow in a food chain?

• It shows the direction of energy flow

• It indicates the size of the organism

• It represents the speed of the organism

• It marks the habitat of the organism.

Why does the number of living things decrease as you move toward the top of the energy pyramid?

• A) Energy is lost at each trophic level

• B) There is more food available

• C) Predators are less common

• D) Plants grow faster.

The trophic level with the smallest population is (a)   .

• Producers
• Primary consumers
• Secondary consumers
• Tertiary consumers

How are populations within trophic levels impacted by the removal of a predator?

• Populations will decrease

• Populations will increase

• Populations will remain the same

• Populations will become extinct.

Match the following scenarios with their impact on biodiversity.

• Stable environmental conditions over a long period

• Biodiversity will become extinct.

• Complete destruction of habitat

• Biodiversity will decrease

• Introduction of a new predator in the ecosystem

• Biodiversity will increase

• Removal of a species within a trophic level

• Biodiversity will remain unchanged

A food web is created with a tertiary consumer. The tertiary consumer in this food web is (a)  

• Grass
• Rabbit
• Lion
• Deer

What are the 5 types of keystone species?

• Predators, plants, prey, mammals, ecosystem engineers

• Predators, prey, producers, decomposers, scavengers

• Predators, plants, decomposers, scavengers, ecosystem engineers

• Predators, plants, prey, decomposers, ecosystem engineers

What are the effects of removing a keystone species?

• Increase in biodiversity

• Decrease in biodiversity

• No change in biodiversity

• Extinction of all species