Adaptations of Organisms

Fish in a lake have to compete for space. Different fish have different optimal temperature ranges. The graph below shows the temperature ranges of four fish species. At which temperature range will there be the most competition for space among these fish species?

• 5°C to 10°C
• 10°C to 15°C 
• 15°C to 20°C
• 25°C to 30°C

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Which organisms in the food web shown to the right are predators that compete for the same prey in this environment?

• Coyotes and rabbits
• White-tailed deer and rabbits
• Leafy weeds and cotton rats
• Bobcats and coyotes

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The ecological niches of three bird species are shown in the diagram. What is the advantage of each bird species having a different niche?

• As more birds feed higher in the tree, available energy increases.
• More abiotic resources are available for each bird.
• Predators are less likely to feed on birds in a variety of locations.
• There is less competition for food.

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Two closely related species of birds live in the same tree.  Species A feeds on ants and termites, while Species B feeds on caterpillars.  The two species coexist successfully because –

• each occupies a different niche
• they interbreed 
• they use different methods of reproduction
• birds compete for food

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The resources a population actually uses as a result of competition.

• niche
• realized niche
• fundamental niche
• competition

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An organism’s _______ describes not only the environment where it lives, but how it interacts with biotic and abiotic factors in the environment.

• biome
• community
• tolerance
• niche

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An organisms Niche can be defined as

• The role its plays in the ecosystem
• It's physical and biological requirements 
• the interactions between it and other organisms
• All of these