Energy in ecosystems

What energy role describes an organism that makes its own food, usually by using energy from the sun?

• consumer
• producer
• carnivore
• decomposer

These organisms break down decaying biotic wastes and then return the materials to the ecosystem.

• decomposers
• scavengers
• carnivores
• producers

Vultures use their excellent sense of smell to find newly dead organisms to eat. This energy role is 

• scavenger
• decomposer
• carnivore
• herbivore

What are the products of photosynthesis?

• water and carbon dioxide
• oxygen and glucose
• oxygen and carbon dioxide
• oxygen and water

Where do plants get the energy for photosynthesis to take place?

• nutrients in the soil

• the sun

• chlorophyll

• bee pollination

Photosynthesis is used to produce food for plants in the form of glucose. In the process, oxygen is released. As shown in the diagram, plants require water and carbon dioxide (from the air). What else is required for photosynthesis and what role does it play?

• Light is required to provide energy for photosynthesis.

• ATP is required as an energy source for photosynthesis.

• Glucose is required as an energy source for photosynthesis

• Oxygen is required to split water molecules in photosynthesis.

Where does the energy come from that is used by organisms in any food web?

• Water

• The atmosphere

• The sun

• Producers

Decomposers are important because:

• They are the source of all energy for food chains

• They help herbivores eat

• They return nutrients from dead matter to the soil

• They absorb energy from the sun

What is the carrying capacity for this sheep population?

• 1.8 million
• 1.25 million
• 1.6 million
• 1.o million

What point on the graph represents the carrying capacity?

• A
• B
• C
• D