Ecosystems Review

What organisms are at the bottom of an energy pyramid?

• Producer
• Consumer
• Decomposer
• Scavenger

How much energy is passed on to each trophic level in an energy pyramid?

• 10%
• 90%
• 50%
• 80%

Which organisms have the most available energy in an energy pyramid?

• Producer
• Consumer
• Decomposer
• Scavenger

Why can't the top level contain a large number of organisms?

• Because as energy moves from the bottom to the top level, less and less energy is available to higher levels.
• Because the original energy from producers is the total energy available to all the organisms in the energy pyramid.
• because only about ten percent of the energy available at one level is transferred to the next level.
• all of the above

A pioneer species is...

• a large organism
• the first organisms to adapt to a new environment 
• The best organism 
• Abiotic organisms 

What is ecological succession?

• A slow change in an environment
• A change that takes days in an environment
• No change
• Abiotic change

What is the difference between primary and secondary succession?

• Primary succession already has soil.
• Primary has soil and secondary does not
• soil is present in both
• primary has no soil and secondary has soil

Suppose that a new predator of the rabbit migrated to this ecosystem. What is the most likely initial effect on the other organisms?

• More competition among the mice for food

• More competition among the hawks for food

• Less competition among snakes for food

• Less grass available for food

An heterotroph is another word for a ________, meaning it needs to ________

• Consumer, eat other organisms

• Consumer, go through photosynthesis

• Producer, make its own food

• Producer, survive without water

An autotroph is another word for a ________, meaning it needs to ________

• Consumer, eat other animals

• Consumer, eat other plants

• Producer, make its own food

• Producer, survive without water