How Ecosystems Work

What is a product of photosynthesis?

• Carbon Dioxide
• Water
• Oxygen
• Solar Energy

What is a product of cellular respiration?

• Oxygen
• Simple Sugars
• Carbon Dioxide
• Solar Energy

In what direction do the arrows point in food webs or food chains?

• Towards the producer
• Where the energy is going
• Towards the prey
• Down

Where is there the least amount of available energy in an "energy pyramid"?

• Top
• Bottom
• Middle
• It remains the same throughout.

Where does carbon exist in an ecosystem?

• air
• water
• plants
• all of the choices

How does humans burning fossil fuels effect the carbon cycle?

• It doesn't
• It releases carbon into the atmosphere
• It traps carbon dioxide
• It forms deposits of coal, oil, & natural gas.

What percentage of the atmosphere is nitrogen?

• 0.04%
• 50%
• 78%
• 93%

Which organism is an example of an omnivore?

• Human
• Cow
• Mushroom
• Lion

What do deep ocean producers (bacteria) use as an energy source?

• hydrogen sulfide
• oxygen
• carbon dioxide
• solar energy

Which of the following organisms is considered to be a herbivore?

• bear
• wolf
• elk
• vulture