Ecology 2 Questions

Producers are generally found at the beginning of a food chain. Which statement best explains why this is true?

• Producers are usually smaller in size than consumers.

• Producers do not rely on other organisms for food.

• There are always more consumers than producers in food chains.

• Consumers are always more complex organisms than producers.

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The diagram below represents a marine food web. The organisms represented by X are

• decomposers

• producers

• carnivores

• scavengers

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The diagram below represents an energy pyramid. Which organisms would most likely be found at level A?

• birds

• worms

• mammals

• algae

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Most of the food and oxygen in the environment is produced by the action of

• saprophytic bacteria

• heterotrophic organisms

• aerobic protozoans

• autotrophic organisms

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A fruit fly is classified as a consumer rather than as a producer because it is unable to

• reproduce asexually

• synthesize its own food

• release energy stored in organic molecules

• remove wastes from its body

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Which row in the chart below best describes decomposers?

• 1

• 2

• 3

• 4

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Two of the herbivores represented in this food web are

• toads and snakes

• deer and mice

• wolves and raccoons

• grasshoppers and toads

Because turkey vultures feed mainly on animals that they have not killed, they are known as

• predators

• scavengers

• omnivores

• autotrophs

Which organisms are primary consumers?

• grass, mice, and hawks

• owls, snakes, and hawks

• seeds, grass, and shrubs

• songbirds, mice, and rabbits

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Young rabbits that eat grass are sometimes eaten by raccoons, which also eat seeds and berries. Bacteria help to decompose the excretions of the raccoon. Which statement about these nutritional relationships is accurate?

• Bacteria are scavengers.

• Rabbits are secondary consumers.

• Rabbits are carnivores.

• Raccoons are both primary and secondary consumers.

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