Ecology Unit

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

• carbohydrates
• sunlight
• water
• carbon

Green plants are

• producers
• consumers
• herbivores
• omnivores

What is the term for each step 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

This is an image of a _________.

• consumer
• scavenger
• decomposer
• producer

symbiotic relationship in which both organisms benefit

• competition
• Mutualism
• nitrogen fixation
• energy pyramid

A living relationship between two species in which one organism is harmed is called...

• mutualism
• commensalism
• parasitism
• niche

The energy at each trophic level in the pryamid of energy decreases by a factor of ____.

• 10
• 1
• 100
• 2

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. 

The image provided is an example of a(n):

• Carnivore
• Herbivore
• Producer
• Autotroph