4.1 Ecosystems: Everything is Connected

An organism that makes its own food is called a

• consumer
• producer
• heterotroph
• chloroplast

A moose is considered to be a consumer because it

• gets energy by eating other resources
• makes its own food
• forms carbohydrates using chemicals
• uses sunlight for energy

The basis for the energy in an ecosystem is provided by

• consumers
• heterotrophs
• chemosynthesis
• producers

Most producers get energy from from the Sun using the process of

• respiration
• consumption
• photosynthesis
• chemosynthesis

Chemosynthesis is the process in which organisms

• form carbohydrates using chemicals
• get energy by eating other organisms
• make chemicals that absorb sunlight
• use energy from the sun to form carbohydrates

A model that shows a single sequence of feeding relationships is called a

• trophic level
• food chain
• food web
• feeding chain

Decomposers are important to ecosystems because they

• return vital nutrients to the environment
• are producers
• capture energy from the Sun
• can be omnivores

Giant pandas eat bamboo almost exclusively. For this reason, giant pandas are an example of a(n)

• carnivore
• omnivore
• generalist
• specialist

A food chain contains oak trees (producer) mice (herbivore) black rat snakes (carnivore) and bald eagles (carnivore). How many trophic levels does this food chain have?

• one
• two
• three
• four

Food webs are models that show

• one sequence of producers and consumers
• networks of feeding relationships
• stored energy in food chains
• only primary consumers in an ecosystem