Chapter 3 - The Biosphere

The total amount of living tissue within a given trophic level is called the 

• organic mass.
• trophic mass.
• energy mass. 
• biomass.

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Only about 10 percent of the energy in a trophic level is available to organisms at the next trophic level.

• True
• False

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Organisms that break down organic matter and return it to the environment are called _____.

• decomposer
• elephant
• puppies
• frogs

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What animals eat both producers and consumers?

• herbivores
• omnivores 
• chemotrophs
• autotrophs

How do most primary producers make their own food?

• by using light energy to make carbohydrates
• by using chemical energy to make carbohydrates
• by changing water into carbon dioxide
• by breaking down remains to make carbon dioxide

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Which of the following is not an abiotic factor?

• Sunlight
• bacteria
• pH
• water

Choose the correct sequence for energy flow within an ecosystem

• herbivores --> producers --> carnivores --> scavengers
• producers --> herbivores  --> carnivores --> scavengers
• producers --> carnivores --> herbivores --> scavengers
• carnivores --> scavengers --> herbivores --> producers

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Which group of organisms performs photosynthesis?

• Autotrophs
• Scavengers
• Heterotrophs
• consumers

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The sun is the ultimate source of energy for terrestrial ecosystems.  Approximately how much energy is available to other trophic levels?

• 1%
• 10%
• 25%
• 59%

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Which of the organisms  would be the top predator?

• zebra
• hyena
• lion
• fungi

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