Symbiotic Relationships and Food Webs

A yeast is a single‑celled organism that can reproduce sexually or

asexually. Which of the following would confirm that a yeast had

reproduced asexually?

• offspring with its own unique genetic information unlike that of

  the parent

• offspring with the same genetic information as each of its

  two parents

• offspring with half the genetic information from each of two parents

• offspring with the same genetic information as the parent

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Which of these is the most important role of technology in the

wild boar study?

• reducing bias during analysis and interpretation of the data

• producing graphs from the averages calculated by researchers

• collecting data over long periods of time and across great distances

• controlling external variables that are difficult for researchers

  to observe

Coyotes share their habitats with gray foxes, which are related to

coyotes and are active at night. Gray foxes eat plants and animals,

including some of the same animals that coyotes eat. Which of the

following describes the most likely effect that coyotes have on

gray foxes in locations with large human populations?

• decreased exposure to parasites and disease

• increased protection from larger predators

• decreased cooperation when finding food

• increased competition over prey species

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Alligators are found throughout Florida. Some of the characteristics of

alligators are listed.

Which limiting factor in an ecosystem would have the greatest impact

on the alligator populations in Florida?

• reduction of shelter and nesting sites

• diseases that affect a certain frog species

• competition among male alligators for a mate

• increase in the rate of water flowing in a river

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Clownfish live among sea anemone's tentacles. The clownfish protect the sea anemone by chasing away organisms that want to attack the sea anemone. The sea anemone's stinging tentacles protect the clownfish from predators that want to attack the fish. What type of relationship exists between the clownfish and the sea anemone?

• parasitism

• commensalism

• mutualism

• non-symbiosis

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One relationship between organisms is that of predator-prey. Which of the following is the best description of a predator?

• An organism that eats another organism

• An organism that participates in symbiosis

• An organism that is eaten by another organism

• An organism that benefits at the expense of another organism

What type of organisms provide the base for this food web?

• Secondary Consumers

• Primary Consumers

• Producers

• Top Predators

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Sadie knows that bacteria can make people sick. Her teacher told her that bacteria are also necessary in any ecosystem. What positive role do bacteria play in an ecosystem?

• Bacteria help in the transfer of oxygen between cells in multi-cellular organisms

• Bacteria break down organic material and return nutrients to the surrounding environment

• Bacteria use photosynthesis to create a major food source for animals in an ecosystem

• Bacteria release large amounts of oxygen into the atmosphere

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While growing on a lawn, some weeds, such as dandelions, struggle to get the nutrients and water that other plants, such as grass, also need to survive. This is an example of which of the following?

• predation

• commensalism

• parasitism

• competition

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Which of the following is an example of parasitism?

• bees and flowers

• a tick on a dog

• barnacles attached to a whale

• a wolf and a rabbit

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