Energy & Trophic Levels
The term that describes organisms that make their own food using sunlight.
What is a producer (autotroph)?
A bird that primarily eats insects is classified as this.
What is an insectivore?
The process that converts atmospheric nitrogen into forms that plants can use.
What is nitrogen fixation (by bacteria)?
This type of population will stay the same unless there are other factors are introduced, such as an increase in predators or a reduction of disease.
What is a stable population?
In a trophic pyramid, the amount of energy available as you move up the pyramid decreases by this amount.
What is 90%?
If the toad population in an area were to increase, it would affect the snake population in this way. (The snakes eat the toads)
What is an increase in population do to more available food?
These are two ways that animals can return nitrogen to the soil.
What is death and waste?
More sugar (food) was added to a population of yeast and this is how it affected the population.
What is an increase due to abundance of food?
Place these in order from lowest to highest trophic level: hawk, grass, mouse
This type of symbiosis occurs when one organism benefits and the other is harmed.
What is parasitism?
This gas is used by photosynthetic organisms and therefore reduced in the atmosphere.
The deer population in an area was stable for several years, until a coyote population moved into the area. The deer population was affected in this way.
What is a decrease in population due to an increase in predators?
The definition of an autotroph and an example.
What is an organism that produces its own food from non-living sources? What is a plant?
Food webs show the flow of energy in this way.
What is a single line of transferred energy?
This common crop is capable of nitrogen fixation due to its symbiotic relationship with bacteria in its root systems.
What are legumes (beans)?
This term describes a group eagles that are all living in the same area around Lake Tahoe.
What is a population?
Producers capture 10,000 joules of energy. This amount of energy is available to the tertiary consumers.
What is 10 joules? (10,000 for producers - 1,000 for primary consumers - 100 for secondary consumers - 10 for tertiary consumers)
Food chains show the flow of energy in this way.
What is the interconnected flow of several chains of energy at once?
This is the process in which nitrates are converted back into atmospheric nitrogen by bacteria.
What is denitrification?
The introduction of invasive Asian carp led to a decrease in the native paddlefish population because of this ecological interaction.
What is competition for food?