Quizzes - BrainMass

1

Where are autotrophs located within a food web?

They are primary consumers

They are primary producers

They are secondary consumers

They are decomposers

2

Which of the following represents a logical food chain?

hawk --> snake --> mouse --> fleas --> seeds

fleas --> hawk --> snake --> mouse --> seeds

seeds --> mouse --> snake --> coyote --> fleas

seeds --> mouse --> coyote --> fleas --> snake

3

Which of the following would be considered producers?

1. Algae
2. Phytoplankton
3. Cyanobacteria

I

I and II

II and III

I, II, and III

4

Why are there usually fewer than five trophic levels in a food chain?

Many carnivores feed on more than one trophic level

If there were more than five, the carrying capacity of the environment would be exceeded.

Each trophic level only has a small amount of energy that was available to the trophic level below it.

There is too much biomass in an ecosystem containing more than five trophic levels.

5

Cows eat grain and humans eat cows. Considering the 10 percent rule, how much grain is required to produce 70kg of human biomass?

7000kg

700kg

70kg

7kg

6

What would be the largest trophic level in an ecosystem containing snakes, insects, plants, frogs, and coyotes?

snakes

plants

frogs

coyotes

7

What is the term for an organism that obtains its energy from several different trophic levels?

omnivore

herbivore

carnivore

primary consumer

8

In which type of these communities would one expect to find more biomass in the primary consumers than in the primary producers?

deciduous forest

coniferous forest

shallow pond

open ocean

9

If a secondary consumer is the highest trophic level in a community, how many trophic levels does the community contain?

four

three

three if it is terrestrial, four if it is aquatic

four if it is terrestrial, three if it is aquatic

10

Which of these organisms would be considered a primary consumer?

a great white shark

a praying mantis

a mushroom

a zebra

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