Ecosystems 5L.2

Which best describes the role of a producer in an ecosystem?

• A producer supplies energy for the consumers in the ecosystem.

• A producer supplies oxygen for the consumers in the ecosystem.

• A producer supplies water for the consumers in the ecosystem.

• A producer supplies light for the consumers in the ecosystem.

Which group of organisms will break down rotten vegetation in gardens?

• consumers

• decomposers

• omnivores

• producers

The main function of a producer in an ecosystem is to

• absorb minerals from the soil.

• change water vapor into a liquid.

• make sugar through photosynthesis

• break down dead plant and animal matter.

The diagram below shows part of an ocean food web. Which effect will an increase in sea urchins MOST likely have on this food web?

• a decrease in the number of sea otters

• a decrease in the amount of seaweed

• a decrease in the amount of sunlight

• a decrease in the number of parrotfish

The picture shows a polar bear.Which change in the environment would MOST likely decrease the ability of this

animal to survive?

• increase in Earth’s temperature

• decrease in Earth’s temperature

• increase in yearly rainfall

• decrease in yearly rainfall

What would most likely happen if all the plants were removed from a

forest ecosystem?

• The consumers would increase.

• The consumers would decrease.

• The decomposers would increase.

• The decomposers would decrease.

In which ecosystem can the greatest variety of organisms be found?

• lake

• estuary

• rainforest

• pond

A simple food chain includes hawks, lizards, and insects. Which will most

likely happen to the lizard and hawk populations if a pesticide is sprayed

to kill the insects, and the lizard and hawk populations cannot find other

food in this ecosystem?

• Both the lizard population and the hawk population will increase.

• Both the lizard population and the hawk population will decrease.

• The lizard population will increase, but the hawk population will

  decrease.

• The lizard population will decrease, but the hawk population will

  increase.

As more people have moved to the beach, the sea turtle population has

decreased. Which is most likely the cause of this decrease?

• tropical storms

• increase in predators

• habitat loss

• warmer temperatures

Forests and grasslands are both examples of terrestrial ecosystems.

Which best describes the differences between forests and grasslands?

• Forests have more trees but usually less rain than grasslands.

• Grasslands have more trees but usually less rain than forests.

• Forests have more trees and usually more rain than grasslands.

• Grasslands have less trees but more rain than forests.