Food Chains #1

The lowest trophic level of any ecosystem is occupied by organisms such as

• lions, wolves, and snakes

• humans, bears, and pigs

• cows, horses, and caterpillars

• plants, bacteria, and algae

Another name for a secondary consumer is

• autotroph

• carnivore

• herbivore

• decomposer

An animal that eats both plants and animals is

• omnivore

• herbivore

• decomposer

• scavenger

An animal that only eats producers is a(n)

• omnivore

• carnivore

• herbivore

• scavenger

Decomposers are important in an ecosystem because

• they perform photosynthesis

• they recycle nutrients back into the ecosystem

• they are the top predators controlling the prey population

• they determine the number of primary consumers that can survive

What organisms are located at level 2 of the energy pyramid?

• autotrophs

• carnivores

• primary consumers

• primary producers

If the producers in a food web were removed, which of the following changes would most likely occur?

• The entire food web would collapse over time.

• The food web would depend on the decomposers for energy.

• The consumers would begin making energy for the food web.

• The populations of the remaining organisms in the food web would increase.

Which of the following best describes the producers in a terrestrial food web?

• They are at the highest trophic level.

• They are not affected by decomposers.

• They perform photosynthesis

• They obtain all their nutrients and energy from consumers.

The diagram shows a partial food web. Which organism is a predator of the mouse?

• rabbit

• grasshopper

• plant

• fox

According to the food web, which two organisms are in competition over the grasshopper

• rabbit and mouse

• toad and mouse

• mouse and snake

• snake and frog