EOG Drills: Ecosystems

Which of these organisms is a producer in a marine ecosystem?  

• fish
• gull
• algae
• worm

Which best determines the number of wolves that can live in an area?  

• the amount of snow in the area each year
• the number of birds that live in the area
• the number of trees in the area
• the amount of food available in the area

What happens to a population and to competition when there is a reduction of living space?

• The population expands and competition intensifies. 
• Competition strengthens while the population contracts. 
• The population increases as competition decreases.
• Competition weakens and the population decreases. 

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? 

• predator-prey
• parasitism
• mutualism
• competition

Consider this food web: 
Where is the largest amount of energy found in this food web? 

• grass
• hawk
• mouse
• grasshopper

Which best explains the importance of nitrogen in the cycling of energy and matter?

• Nitrogen decreases protein production in plants.
• Nitrogen decreases the effectiveness of photosynthesis.
• Nitrogen increases protein production in plants.
• 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? 

• The population of deer will decrease. 
• The population of deer will increase.
• The population of deer will remain the same. 
• The population of deer will become extinct. 

Where do plants get most of the energy they need to live and grow? 

• water
• soil
• air
• sunlight

Which of these organisms is a producer in a marine ecosystem?

• fish
• algae
• gull
• worm

Which statement about parasitism is most true?

• Both organisms benefit.
• Both organisms are negatively impacted.
• One organism benefits and the other is negatively impacted.
• Neither organism is effected