In this food chain, the spiders are....

• producers

• primary consumers

• competitors

• secondary consumers

Wolves and hawks are at the same trophic level because they..

• both live on land

• are both large mammals

• both eat primary consumers

• have similar hunting patterns

Which organisms in this food web can be described as both primary and secondary consumers?

• Hawks

• Weasels

• Raccoons

• Mice

Energy used by producers in a grassland food web is provided by....

• sunlight

• photosynthesis

• oxygen

• carbon dioxide

In this diagram of a marine food web, which term describes the sea turtle?

• aquatic herbivores

• autotrophic producer

• third-level consumers

• primary decomposers

The diagram represents different levels of marine food pyramid. Between which two levels is the greatest amount of energy transferred?

• R and Q

• S and R

• T and S

• U and T

According to this food web, which of the following are omnivores?

• snakes

• rabbits

• mice

• grasshoppers

This pyramid of numbers indicates number of organisms in a community. Which situation below would form a pyramid showing more consumers than producers?

• small plot with 500 corn plants and 100 grasshoppers

• one pond with 300 producers and one snake

• 11,000 m squared lake with 75 fish and one alligator

• one giant oak tree with 10,000 insects and 10 lizards

The diagram shows relationships in an ecosystem. What do the arrows represent?

• the direction of population migration

• differences in dietary habits

• progressively smaller organisms

• the direction of energy flow

Insecticides help humans compete with insects for a resource. Which resource is most likely to be preserved for humans through the use of insecticides?

• sunlight

• water

• food

• air