biodiversity & natural selection

What does biodiversity mean?

• Only one species in an area.
• The different amount of species in an area
• All abiotic life
• Nitrogen fixation

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The illegal capture or killing of an organism, often for money, is called...

• poaching
• harvesting
• fragementation
• extinction

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All living and nonliving things in an environment and the many ways they interact are called ______

• ecosystem
• community

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A drought has hit this grassland biome. How will this effect the rabbit population?

• The rabbits will increase in number.
• The rabbit population will stay the same.
• The rabbit population will decrease.
• The rabbit population will become extinct immediately.

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Brown trout consume (eat) more tadpoles when the fly larvae reduce in number (decrease).  This proves...

• The dependence of organisms and biodiversity in an ecosystem
• Diversity increases as organisms decrease
• Losing an animal is good for ecosystems
• Changes in ecosystems create new organisms

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Variation happens as a result of the exchange of genetic information as it is passed fromparent to offspring.Which of the following is true about inherited variation?

• Variation can influence the resources that are available to an organism.
• Variation can influence whether organisms are more likely to survive to reproduce.
• Variation can influence the amount of rainfall in an ecosystem
• Variation can influence the amount of available food in an ecosystem

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In a population of spiders there are three different sizes: small, medium, and large.
---The large spiders are easily seen by predators.
---Small spiders have a difficult time finding food.
What will most likely happen to this population of spiders after many generations?

• Small and large spiders will mutate
• Medium spiders will be the most plentiful
• Large spiders will learn to hide from predators
• Small and medium spiders will be the least plentiful

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The habitat of a moth species included trees with both light and dark colored bark.Therefore the moth species included both light and dark colored variants.Then the light-colored trees were wiped out by a disease, and within a few years nearly all the moths in this forest were dark colored. Which of the following choices BEST explains what happened?

• The light moths that survived all had dark offspring in order to adapt to the change.
• The dark moths were less visible to predators, so mostly light moths were eaten.
• The few light moths that survived did not mate, and therefore they had no offspring.
• The light moths changed their wing pigments to darker colors to avoid being eaten.

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Which statement best explains how natural selection occurs?

• when adaptations help an organism reproduce and survive.
• when organisms are geographically isolated.
• when an organism’s offspring grow vestigial structures.
• when characteristics from the parent organism are inherited.

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During the early settlement of the United States, pioneers cut down large tracts of forests on the east coast to use for home construction, for firewood, and to create cleared spaces to plant crops.What was the most likely effect of this kind of action?

• decreased plant and animal diversity
• decreased human populations
• decreased carbon dioxide production
• increased organism biodiversity.

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