Biology test 4 ECOSYSTEM
The Nutrient cycles
Atmospheric cycles- molecules in air Sedimentary cycles- molecules in soil Hydrological cycle
what is biological magnification?
process through which some substances become more concentrated in organisims at higher trophic levels example DDT on bald eagles
Which of the following would be an abiotic feature of an ecosystem?
river
3rd trophic level
secondary consumer
Phosporpous is found in
ADP ATP DNA sedimentary- soil, sediment occurs on land cycles through food web
Which of the following are included in an ecosystem?
Abiotic things community biotic things population
Choose the answer that best describes the flow of energy in ecosystems.
All energy flows in one direction through the ecosystem.
Which statement is in agreement with the First Law of Thermodynamic?
Energy can not be created or deystroyed
how to mess up an eco system?
Extinctions!
What best explains the low productivity of the open ocean?
Nutrients rapidly sink to depths that sunlight cannot reach
What molecule is cycled through a sedimentary cycle?
Phosphorus
All of these molecules are essential in living things. Which of them contains phosphorous?
RNA ATP ADP DNA
Which molecule is produced by burning oil and coal?
SO2, sulfur dioxide
net primary productivity (NPP)
amount of energy captured minus metabloic heat loss can be estimated by a new biomass
definition of ecosystem
association of organisms and their physical environment, interconnected by ongoing flow of energy and a cycling of materials
succession defintion and types
changes in a community over time primary succession: newly created habitat secondary succession: recovering after a distrubance
2nd atmospheric level: Nitrogen
cycles through food webs removed by autotrophs=soil returned from decomposing bacteria and crop rotation
ecosystem processes
energy flows THROUGH recycling of matter creates food chains/webs
Which of the following describes the ultimate disposition of most energy in an ecosystem?
eventually returns to space in the form of heat
All energy is passed from producers to consumers. T/F?
false
3rd atmospheric level: Sulfur
gets there by sea spray, bacteria, volcanoes, acid rain, oxygen
In marine ecosystems, net primary productivity tends to be
greater along shorelines where terrestrial nutrients enter the marine environment.
The atmosphere of Earth today contains ___________ carbon dioxide than it did 100 years ago.
more
1st trophic level consists of?
primary producer
A major purpose of crop rotation is to replenish _____________ in the soil.
nitrogen
what is a trophic level?
number of steps away from an ecosystems energy source moving up a food chain, less energy is available at each higher trophic level
2nd trophic level
primary consumer
Energy flows from the _________ to ___________.
sun to producers
Which of these statements are true regarding fossil fuels?
they release carbon dioxide when burned
1st atmospheric cycle : Carbon
too much in the atmosphere how does it get there? aerobic respiration, burning fossil fuels How do we get rid of it? photosynthesis
How do we get our nitrogen?
we eat plants and animals that have nitrogen
