Unit 3 Review Question Preview (ID: 29685)


8.L.3.1, 8.L.3.2, And 8.L.3.3. TEACHERS: click here for quick copy question ID numbers.

Which best explains the importance of nitrogen in the cycling of energy and 
matter?
a) Nitrogen increases protein production in plants. 

b) Nitrogen decreases protein production in plants. 

c) Nitrogen decreases the effectiveness of photosynthesis.
d) Nitrogen increases the effectiveness of photosynthesis. 


If wolves prey on deer for food, what will most likely happen to the deer population if wolves are removed from an area where deer live?
a) The population of deer will increase. 

b) The population of deer will decrease. 

c) The population of deer will remain the same. 

d) The population of deer will become extinct. 


Where do plants get most of the energy they need to live and grow?
a) water
b) soil
c) air
d) sunlight

Kudzu vines grow by climbing and wrapping around trees. Trees covered by kudzu can die because they are starved of sunlight. What type of relationship exists between the trees and the kudzu growing on them?
a) competition
b) mutualism
c) parasitism
d) predator-prey

What happens to a population and to competition when there is a reduction of 
 living space?
a) The population expands and competition intensifies. 

b) Competition strengthens while the population contracts. 

c) The population increases as competition decreases. 

d) Competition weakens and the population decreases.

Which best determines the number of wolves that can live in an area?
a) the amount of snow in the area each year 

b) the number of birds that live in the area 

c) the number of trees in the area 

d) the amount of food available in the area

Which of these organisms is a producer in a marine ecosystem?
a) fish
b) gull
c) algae
d) worm

Which best describes an abiotic limiting factor in a population?
a) animals
b) plants
c) water
d) food

Some plants have fungi that live intertwined in their roots. The fungi provide nutrients to the plants, while the plants’ roots provide a habitat for the fungi. Which relationship is demonstrated by this example?
a) predator-prey
b) competition
c) mutualism
d) parasitism

Which level of a food chain has the most energy?
a) decomposers
b) scavengers
c) consumers
d) producers

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