Ecology
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What percentage of our atmosphere does nitrogen make up?
78%
How does nitrogen enter our atmosphere?
Precipitation
Where does nitrogen go first after entering the atmosphere?
The nitrogen-fixing bacteria at the roots of the plants
What happens to Nitrogen at the roots of the plants?
Nitrogen is combined with hydrogen to create ammonia.
What is it called when nitrogen is mixed with hydrogen to create ammonia?
ammonification
After nitrogen fixation, oxygen is mixed with ammonia. What is this called?
Nitrification
After nitrification, nitrogen is in a form called WHAT?
Nitrites
Bacteria convert the nitrites into WHAT?
Nitrates
Plants can absorb the nitrogen after it takes the form of WHAT?
Nitrates
This sphere provides an ecosystem that organisms need to survive, and it contains the Earth’s biodiversity and most of our resources.
Biosphere
This sphere is the mass of all the water above and below the surface of the land, needed as water supplies many life forms.
Hydrosphere
This sphere is all of Earth’s lands, starting from the ground to the Earth’s inner core. Without this sphere, there would be no earth, and a great lack for resources.
Geosphere/lithosphere
This sphere is a mixture of gasses surrounding the earth, important because it provides organisms with air to breathe and it protects us from solar radiation.
Atmosphere
What is a limiting factor (definition)
A factor that constrains a population’s size, and slows or stops it from growing
Abiotic limiting factors (on the terrace?)
Sunlight, temperature, soil, water, and oxygen
Biotic limiting factors
Food, bacteria, mates, relationship with other organisms for resources
What are the three forms of aquatic ecosystems?
Oligotrophic, eutrophic, and watersheds
This aquatic ecosystem hosts very little vegetation
Oligotrophic
This aquatic ecosystem hosts large quantities of organisms (so much its euphoric)
Eutrophic
This ecosystem receives precipitation and drains it into water reservoirs
Watersheds
Definition of an organism’s niche
An organism’s niche is the environmental and physical conditions that the organism requires
What is fragmentation? (fragments, pieces)
A form of asexual reproduction in which an organism breaks into individual pieces when it reaches full maturity.
During photosynthesis, a plant absorbs WHAT?
Carbon dioxide, water and USES light energy from the sun
What does a plant create during photosynthesis?
Glucose(sugar), and oxygen