8.11A Competition

          An earthworm farmer wanted to grow three species of earthworms, but earthworms can be very picky about the temperature, moisture, and pH balance of their soil. This graph shows the range of soil conditions preferred by three species of earthworms in an earthworm soil bed. 
          Which of these conditions would cause the most competition for the resources among the three species of earthworms?

• Very warm soil, ph of 6, and dry.
• Very cold soil, pH of 7, and high moisture.
• Moderate temperature, pH of 6.5, and moderate moisture.
• Moderate temperature, pH of 7.0, and high moisture.

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Bromeliads are small plants that grow attached to the sides of large trees high above the ground in warm, damp and densely crowded tropical rainforests. Bromeliads do this because they are in competition with other plants for -

• soil.
• heat.
• light.
• water.

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Which is NOT an abiotic factor:

• Soil
• Air
• Bacteria
• Water

If the grasshopper were to be removed completely from the food web, what organism would be most affected?

• The squirrel

• The shrew

• The deer

• The rabbit

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Temperature, light, air, water, and climate are all __________ factors of the environment. 

• biotic
• abiotic

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Animals from two different species utilize the same source of nutrition in one area. It is most accurate to say that the animals…

• will learn to get along
• will compete for food
• will die because there will not be enough food for both of them
• will learn to eat different foods

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A living or once-living organisms in an ecosystem is a

• population
• biotic factor
• abiotic factor
• community

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Which of the following is not a biotic factor?

• mushroom
• air
• elephant
• coyote

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Which organism do the owl and the weasel compete for in the food web?

• Hawk
• Spider
• Grasshopper
• Shrew

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Which of the following is a herbivore?

• cricket
• frog
• hawk
• shrew

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