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Ecology

Terms in this set (55)

How do organisms transfer energy?
By eating and being eaten
Each step in a food chain or food web is called a what?
Trophic level
How much of the available energy on each level is passed to the next trophic level?
10%
What kind of organism is at the first trophic level?
Producers or autotrophs
What kind of organism is at the second trophic level?
Primary consumers or heterotrophs
What kind of organism is at the third trophic level?
Secondary consumers or heterotrophs
What kind of organism is at the fourth trophic level?
Tertiary consumers or the top predator (this is the top of the food chain)
What does the direction of the arrows in food webs and chains show you?
The flow of energy
How does the food chain also show pyramid trophic levels?
The farther the organism is to the right the higher it ranks on the trophic levels
If an organism is eating on the 3rd trophic level, why is he not a tertiary consumer?
Because the producer is always on the first trophic level, therefore the organism would be on the third trophic level because it is a secondary consumer.
Autotroph
Obtains its energy from abiotic sources (producers)
Heterotroph
Obtains its energy by consuming others (consumers)
Herbivore
Only eats plants
Carnivore
Only eats other animals
Omnivore
Eats both plants and animals
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