Ecological Relationships

When predator numbers decrease, prey numbers ____________ because fewer of them are being consumed.

• decrease
• increase
• stay the same
• divide in half

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A mongoose eating ticks off a warthog, or a starling eating ticks off a cow are examples of what type of symbiotic relationship?

• Cooperation

• Parasitism

• Commensalism

• Mutualism

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A mosquito feeds off of the blood of different organisms. This usually causes discomfort to the organism and sometimes disease and death. This is an example of:

• Parasitism
• Decomposition
• Commensalism
• Mutualism

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When they land in a flower, the bees get some pollen on their hairy bodies, and when they land in the next flower, some of the pollen from the first one rubs off, pollinating the plant. This is known as a relationship in which both organisms involved benefit, called:

• Predator-Prey

• Commensalism

• Mutualism

• Decomposition

Which term describes this statement: All the populations of all the different species that live together in a particular area

• Mutualism

• Community

• Commensalism

• Predator/Prey

Organisms of two species using the same limited resource and having a negative impact on one another, such as hyenas and lions both hunting zebra, represent what type of relationship?

• commensalism

• predator-prey

• mutualism

• competition

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Wasps often lay their eggs just inside the eggs of butterflies. The wasp larva (baby wasps) are able to get lots of nutrients and protection from the butterfly/caterpillar egg while its developing. After the caterpillar is born, the wasps continue lurking in the flesh of the caterpillar, soaking up more nutrients and drinking its blood. The wasp larva must keep its host alive, so it avoids damaging the vital organs.

What type of symbiosis is being described?

• predator/prey

• competition

• commensalism

• parasitism

The nonliving aspects of an ecosystem.

• Abiotic factors
• Biotic factors

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The living portions of the ecosystem.

• Biotic factors
• Abiotic factors

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Parasites and predators help maintain ecosystem stability because...

• They increase the population of all organisms so ecosystems become diverse

• They decrease the population of certain organisms to ensure no species overpopulates

• They increase the survival of all species

• Any of the above are possible

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