LS Ch 17 Quiz A

(True or false): Since energy is noncyclic, an ecosystem must constantly supply its organisms with usable energy.

• True
• False

(True or false): An ecological pyramid shows a food web's energy.

• True
• False

(True or false): One factor that affects ecological pyramids is the presence of omnivores, which eat both plants and animals, in an ecosystem.

• True
• False

The passing of materials and energy from one organism to another is called a _______.

• food chain
• food web
• ecological pyramids
• ecosystem

All interrelated food chains in an ecosystem form a ______________

• food chain
• food web
• ecological pyramids
• ecosystem

Each level of a __________ represents a different type of organism in the food chain, and each is dependent on the level below it for its energy.

• food chain
• food web
• ecological pyramids
• ecosystem

The first organism in a food chain is a ___________.

• producer
• consumer
• decomposer
• ecologist

Food chains end with a specific type of consumer called a ____________________.

• producer
• consumer
• decomposer
• ecologist

An ecological pyramid is divided into layers called __________________

• producer
• consumers
• trophic levels
• factors

How much energy gets passed up from the level below it in an ecological pyramid?

• 90%
• 50%
• 10%
• 5%