IQWST Unit 3 Review

How do producers obtain energy in an ecosystem?

• Photosynthesis

• Chemosynthesis

• Respiration

• Decomposition

The source of all energy in an ecosystem comes originally from the _________.

• consumers

• producers

• sun

• organisms

The arrows in a food web show the direction...

• water is flowing

• matter or energy are flowing

• organisms are moving in

• consumers are moving in

Trapping has severely reduced the population of rabbits in an ecosystem, as shown in the bar graph below. What is the most likely effect this will have on other organisms?

• The hawk population will increase rapidly and the rabbit population will decrease rapidly.

• The snake population will decrease rapidly and the grass population will increase rapidly.

• The grass population will decrease rapidly and the snake population will increase rapidly.

• The grass, rabbit, snake, and hawk populations will all decrease rapidly.

Explain the difference between a food chain and a food web.

• A food chain is a web of interconnected organisms, while a food web is a linear sequence of who eats whom.

• A food chain involves only one organism eating another, while a food web involves multiple organisms eating each other.

• In a food chain, organisms are not connected, while in a food web, they form complex relationships.

• In a food chain, organisms are arranged in a linear sequence of who eats whom, while in a food web, multiple interconnected food chains show the complex relationships and interactions among different organisms.

An invading fungus develops in the forest and kills many of the green plants.  Which of the following populations will be directly or indirectly affected by the invader?

• owl population

• beetle, grasshopper, and snail populations

• shrew, spider, and wood mouse populations

• all of the above

What are some examples of consumers in an ecosystem?

• Primary consumers, secondary consumers, tertiary consumers

• Herbivores, carnivores, omnivores, decomposers

• Producers, autotrophs, heterotrophs

• Photosynthesis, respiration, fermentation

The model above is an example of a ...

• food chain

• food web

• habitat

• ecosystem

What role do decomposers play in the ecosystem?

• Decomposers break down dead organisms and organic matter, returning nutrients to the soil.

• Decomposers provide energy to the ecosystem.

• Decomposers regulate the climate in the ecosystem.

• Decomposers create new organisms in the ecosystem.

Which organisms are most affected by bioaccumuation?

• Top predators

• Producers

• Primary Consumers

• Herbivores