Energy Transfer in Ecosystems

An arctic food web is shown. Suppose that the lemming population is removed from the web. Which of the following would be a likely short-term effect of this change?

• The arctic fox population will increase.

• The polar bear population will increase.

• The caribou population will decrease.

• The snowy owl population will decrease.

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A team of ecologists observed feeding patterns of several populations in the desert. Which of the following best explains the difference in the amount of available energy in the trophic levels of the desert ecosystem?

• There is less energy in the producers because they are at the bottom.

• There is more energy in the producers because they provide energy for all the consumers in the ecosystem.

• There is more energy available in the tertiary consumers because they need the energy to hunt.

• There is more energy in the level containing the top predators because they are larger in size.

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If the grass has 100% of energy how much does the secondary consumer get?

• 10%

• 1%

• 100%

• 0.1%

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Which is true for the organisms in the food web shown?

• The hawk, lynx, and red fox only have one energy source.

• The red fox occupies the niche of generalist with the most energy sources available.

• Lynx only occupy the niche of secondary consumer.

• The hare and shrew occupy the same niche as secondary consumers.

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Fungi, bacteria and worms can all break down organic material, what is the correct name for these type of organisms.

• Producers

• Consumers

• Predators

• Decomposers

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A system comprising all the biotic and abiotic factors in an area and all the interactions among them

• Ecosystem

• Environment

• Tundra

• Environmental Interactions

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Organisms that transform energy from the Sun and use carbon dioxide and water to make food

• Producers

• Decomposers

• Photosynthesis

• Consumers

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The direction of the flow of energy in a food web is represented by ___.

• Light bulbs
• Dotted Lines
• Arrows
• Bubbles

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An animal that hunts other animals for food is a ___________

• herbivore
• predator
• prey
• omnivore

Choose two things an ENERGY PYRAMID model is useful for illustrating or predicting.

• Shows order of organisms in feeding relationships.

• Multiple feeding relationships depicted (shown).

• Can show which animals are picky eaters and which are not.

• Shows the amount of energy available at each feeding level.

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