Energy Flow

An organism that produces its own food supply from the sun is called a(an)

• heterotroph
• consumer
• decomposer
• autotroph

What is the original source of almost all energy in most ecosystems?

• carbohydrates
• sunlight
• water
• carbon

What is the term for each level in the transfer of energy and matter within a biological community?

• energy path
• food web
• trophic level
• food pyramid

Autotrophs make up the _______ level in all ecosystems.

• First
• Second
• Third
• Fourth

What does a food web represent?

• All connections of energy flow throughout all organisms in a habitat.
• The specific ways that mutualism is carried out.
• A single pathway or energy flow between organisms. 
• How carnivores get their food. 

One reason predators might increase is

• The weather is warmer
• Parasites have increased
• The prey have increased
• Food has decreased

Why are quaternary consumers so rare?

• It is too hard to catch prey
• There isn't enough energy left in the food
• The food sources do not taste good
• There is not enough room for them on the food chain

what does the environment loss at each trophic level in this ecosystem?

• food sources
• heat
• living space
• nutrients from the soil

How does energy transfer in the trophic levels of a food pyramid?

• Energy doesn't transfer.
• Energy increases as it goes up.
• Energy decreases as it goes up.
• Energy stays the same.

Which of the following explains why producers are always found at the start of a food chain?

• Producers are bigger than consumers.
• Producers are found in fewer numbers.
• Producers convert light in food energy.
• Consumers are eaten by a variety of producers.