Sci 7B Population and Ecosystems Test Retake

Which example shows a relationship between a living things and a nonliving thing?

• An insect is food for a salmon

• Water carries a rock downstream

• A tree removes a gas from the air

• A flower makes food for a butterfly

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A bee goes from flower to flower, gathering nectar. At each stop, the furry body and legs accumulate pollen from the flower, which the bee transfers as it moves. The flower needs pollen to reproduce and the bee needs nectar to eat. What kind of relationship is this?

• parasitism

• commensalism

• mutualism

• predation

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Tapeworms are long, flat parasites that can live in the intestines of animals, including humans. The tapeworm feeds off the food the host animal consumes, and the host animal loses nutrition as a result. What kind of relationship is this?

• parasitism

• commensalism

• mutualism

• predation

Which of the following is NOT true regarding predation?

• Predation helps maintain an ecological balance

• Predators keep the numbers of prey animals under control

• Predators choose the sick and weak prey because they are easier to catch

• Predators choose the sick and weak prey because they are trying to maintain ecological balance

Rabbits introduced into Australia over 100 years ago have become a serious pest to farmers. Rabbit populations increased so much that they displaced many native species of plant eaters. What is the MOST logical explanation for their increased numbers?

• Rabbits have a high death rate

• There are few effective predators

• Additional rabbit species have been introduced

• There is an increase in rabbit competitors

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When does COMPETITION happen in an ecosystem?

• When there is enough resources for all living things to survive.

• When animals move away from their ecosystem.

• When two or more living things need the same resource to survive.

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What will happen to the rabbit population if the owl population becomes bigger?

• The rabbit population will become smaller

• The rabbit population will become bigger

• The rabbit population will stay the same

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What will happen to a population if they do not have enough resources?

• The population will grow bigger

• The population will all die

• The population will have to move away or they will die

• The population will sit and wait for new resources

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Currently sharks are on a rapid decline due to overfishing. If sharks go extinct will this affect the biodiversity of the ocean?

• No, sharks are not important.
• No, sharks will only affect the seal populations.
• Yes, it will disrupt the entire food chain in the ocean.
• Yes, but only a little.

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What happens when humans cut down forests to build shopping malls?

• Plants and animals thrive in the new environment and pollution decreases.
• New animals species form and plants produce more oxygen.
• The shopping mall reduces the amount of pollution in the area.
• Habitat is altered, plants and animals destroyed, and pollution increases.

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