Organisms that obtain energy by eating other organisms in their ecosystem are called:
Consumers / Heterotrophs
What is the process of rain or snowfall called?
precipitation
Why must nitrogen be "fixed" ?
the N2 gas in the air is not in a form that is usable by plants
What is a population?
A group of individuals that belong to the SAME species, living in a given area at the same time.
________ are animals that eat the carcasses of dead animals.
Scavengers
What is the process of turning a liquid into a gas?
Evaporation
What are the 4 elements make up 96% of mass of most living organism?
oxygen, carbon, hydrogen, nitrogen
How does nitrogen fixation occur?
nitrogen-fixing bacteria
Under ideal conditions with ______ resources, a population will grow exponentially.
Unlimited
Explain the difference between a food web and a food chain?
A food chain is a series of organisms in which energy is transferred from one trophic level to another. (Simple, one directional)
A food web consist of many interconnected food chains at many trophic levels. (More complicated and realistic)
What is transpiration?
the evaporation of water from plants
When a population has unlimited resources, it rises slowly at first and then rapidly rises faster and faster, creating a J-shaped curve. This is known as _________ growth.
Exponential
Name 3 types of consumers
Herbivores, Omnivores, Carnivores and Decomposers
What two things can happen with water after precipitation has returned it to the ground?
Percolation and Surface Runoff
T or F : Photosynthesis is a step in the global nitrogen cycle
False
When a populations growth slows and then stops, following a period of exponential growth, creating an S-shaped curve. This is know as _______ growth.
Logistic
Which level of an energy pyramid has the most energy available (biomass)?
Producers
How much of the earth's surface is covered in water?
A. 30%
B. 10%
C. 70%
D. 50%
C. 70%
When a forest fire happens in the forest where does all the carbon go?
A. Into the atmosphere
B. Into the soil
C. It is destroyed
D. The fire eats it for fuel
A. Into the atmosphere
All organisms require nitrogen to make amino acids, which combine to form proteins, and nucleic acids such as _ _ _ and _ _ _.
DNA and RNA
Once an environment has reached the maximum number of individuals it can support, the population then stabilizes at _______ _______ .
Carrying Capacity