Quiz 1.2 - Ch 3 -  Practice Quiz

Complete each statement.


Autotrophs capture energy from sunlight or ____________________ to produce food.



Organisms that break down organic matter and return it to the environment are called ____________________.


Figure 3-1


Of the organisms represented in Figure 3-1, the organisms in the oceans with the smallest total biomass are most likely the ____________________.



Water can enter the atmosphere through the processes of evaporation and ____________________.



Living organisms require nitrogen to make ____________________, which are used to build proteins.


Short Answer


Describe the role of algae in ocean food chains.


Describe the flow of energy among the following members of an ecosystem: decomposers, autotrophs, heterotrophs, and the sun.

Figure 3–2


Describe the flow of energy to the owl in Figure 3-2 if the tree provides 1500 calories of energy to the insects.


What is the most likely explanation for why Figure 3-2 shows only one organism at its base? In what way would an energy diagram be different?


Figure 3–3


Explain how seepage and transpiration in Figure 3-3 are related.



Describe the two sources of energy that fuel life on Earth.


How does a food web differ from a food chain?


Describe the three types of ecological pyramids.


Describe the roles of bacteria in the nitrogen cycle.


How might a large input of phosphorus affect a freshwater lake over time?




Figure 3–4


Predicting How might a large omnivore change the flow of energy in Figure 3-4, diagram II?


Inferring If a limiting nutrient is supplied to the producers in Figure 3-4, diagram II, what effect could it have on the birds?


Interpreting Graphics How many kilocalories (kcal) can the top carnivore in Figure 3-4, diagram I, store? Explain.


Applying Concepts What three scientific approaches do ecologists use to explain complex relationships, such as in the energy pyramid in Figure 3-4?


Applying Concepts Describe how chemosynthesis could contribute to the energy represented by Figure 3-4, diagram I.

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