Ecology 2

Two arctic fox are fighting with a polar bear for a sea lion carcass. One fox distracts the bear while the other eats. What type of limiting factor is the polar bear?

• Predator-Prey Relationships

• Competition

• Herbivory Effect

• Weather

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What is the carrying capacity of the graph?

• around 500
• more than 500
• less than 500
• around 600

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What is the carrying capacity of the following graph?

• 1000
• 8000
• 800
• 600

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Environmental factors that keep a population from increasing. 

• Carrying Capacity
• Limiting Factors

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A population of salamanders that live in a river require clear, fresh water to survive. New housing developments have caused tons of sediment to muddy the river. Which

of these most likely will happen to the salamander population?

• The salamanders go live on land.

• The salamanders will move across land to another river.

• The salamanders will quickly adapt to living in the muddy water.

• The salamanders will decrease in number because of the water quality.

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A scientist was studying a population of fish in a pond over a period of 10 years. He observed that

the population increased each year for 3 years, and then remained nearly constant for the rest of

the study. The best explanation for this observation is that the population had

• stopped reproducing

• reached carrying capacity

• mutated into a different species

• run out of food and all died

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How nitrogen is "fixed" into useable form for plants

• only through action of bacteria
• only through lightning
• through action of bacteria & lightning
• through photosynthesis

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Organism that breaks down dead plants & animals and releases nitrogen back into atmosphere

• bacteria
• plants
• animals
• producers

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How do  animals get nitrogen?

• the atmosphere 
• eating other organisms
• bacteria
• lightning 

True or False. The nitrogen in the atmosphere is in the right form for living things to use.

• True

• False