Ecosystem

Where do plants get most of the energy they need to live and grow?

• Water 
• Air
• Sunlight
• Soil

• Hawk
• Grass
• Mouose
• Grasshopper

When animals break down glucose to create energy, they release water and carbon dioxide (CO2.) How can carbon dioxide (CO2) be reused within the food web?

• It can be used by animals as a source of oxygen.
• It can be used by both plants and animals to produce energy.
• It can be used by plants during photosynthesis to create glucose.

Which consume(s) energy from dead organisms?

• the Sun
• producers and consumers
• trees, grasses, and shrubs
• scavengers, fungi, and bacteria

Which shows the correct flow of energy through this simple food chain?

• fox → grass → rabbit
• grass → fox → rabbit
• grass → rabbit → fox
• rabbit → grass → fox

After decomposers break down decaying organisms, which directly uses the resulting nutrients?

• animals
• fossils
• plants
• the Sun

Which molecule is necessary in order for respiration to occur in plants and animals?

• Nitrogen
• Oxygen
• Sulfur
• Carbon Dioxide

Which best describes how green plants obtain the carbon dioxide needed for photosynthesis?

• Enters through the roots
• Enters through the leaves
• Produced in the leaves
• From stored food

• Energy decreases as it is lost as heat to the environment.
• Energy increases as it is gained from the environment.
• Energy is unavailable because it is used up by the organisms at Level 1.
• Energy is transferred as it is produced by organisms in the next level.

• Organism 1 is most likely a type of bacteria.
  
• Organism 2 is definitely an omnivore.
• Organism 5 is most likely a plant eater.
  
• Organism 8 is definitely a carnivore.