Warm Up Ecology Review

True or False? Leaves still attached to a live tree are considered biotic, but the leaves that have fallen off the tree are considered abiotic.

• True

• False

A population in an ecosystem cannot grow indefinitely. There are limiting factors in each ecosystem that keep a population within a certain size range. Which of the following is most likely NOT a limiting factor for a population of deer in a forest ecosystem?

• the number of perching birds present

• the number of mountain lions present

• the amount of edible plants available

• the amount of space in the forest

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Carrying capacity is the maximum number of individuals an environment can support for a long period of time. What might happen when a population grows larger than the carrying capacity of the land?

• Nothing should happen to the population or the ecosystem it lives in.

• The population will eventually learn to use other resources.

• The population uses up its resources faster than they are replenished.

• The population improves the dynamics of the local ecosystem.

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Which of the following are examples of interspecific competition and are correctly shown in the food web? (You will select more than one answer)

• The salmon and trout compete with each other for smelt and alewife.

• The smelt and alewife compete with each other for zooplankton.

• The salmon and trout compete with each other for sea lamprey.

• The smelt and the alewife compete with each other for the salmon.

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An ecosystem that offers many different niches...

• supports animal life but not plant life.

• cannot support very many species at once.

• usually only supports insect life.

• can support many different species.

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True or False? If a population experienced more births than deaths over the course of a year, then the population size will have increased.

• True

• False

The tickbird and the rhinoceros can often be seen together roaming the plains of Africa or Asia. The tickbird uses the rhinoceros for transportation and also eats the ticks off the rhinos for food. The type of symbiotic relationship that exists between the tickbird and the rhino is...

• parasitism

• competition

• commensalism

• mutualism

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In the food chain below, which organism is the secondary consumer?

Algae --> Crustacean --> Fish --> Shark

• Algae

• Crustacean

• Fish

• Shark

Which of the following lists is made up of ONLY biotic factors?

• Fish, Seaweed, Shark, Water

• Tree, Grass, Sun, Butterfly

• Pumpkin, Acorn, Squash, Turkey

• Temperature, Sunlight, Rain, Wind

A plant nursery only grew one type of tomato. All of their tomatoes died from the same disease. What was most likely true of the tomato plant population?

• It had too little biodiversity

• It had a lot of resistance to disease

• It had a few plants that were resistant to disease

• It had too much genetic variation

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