An environment consists of complex networks of interlinked systems.
What is a system?
A bunch of different parts working together to accomplish different goals.
A bunch of different parts working together to accomplish the same goal.
One part working to accomplish many different goals.
Without a part, the system will still work properly.
System inputs _?
Pull something out of the system.
Put something into the system
Take something away from the system
Don't do anything to interact with the system
System outputs _?
Are the result of the system inputs
Create the same input again for the same system
Are useless
A system output can serve as a input.
What are the types of feedback loops?
Positive
Electron
Neutral
Negative
In a negative feedback loop, the output acts as an input that moves the system, in a new direction.
Most systems do not use a negative feedback loop.
A negative feedback loop pushes towards _.
equilibrium
preservation
combustion
unsustainability
A positive feedback loop has the opposite effect of the negative feedback loop.
A positive feedback loop pushes towards _.
stable situations
unstable situations
Positive feedback loops are rare in nature.
What is the lithosphere?
Earth's decay
Earth's crust
Everything but earth's crust
What is the atmosphere?
Water
Outer space
Air surrounding our planet
What is the hydrosphere?
All land
All water
Everything but water
What is the biosphere?
Total of all the planet's biotic and abiotic components.
Total of all the planet's biotic components
Total of all the planet's abiotic components
Total of all the planet's water
Eutrophication is the process of nutrient over-enrichment.
Chemistry does not play a central role in many environmental challenges.
All material that has mass and occupies space is matter.
Laws of Conservation of Matter
can be transformed
cannot be transformed
cannot be destroyed or created
stays constant as its recycled
An element is _.
a fundamental type of matter
a fundamental type of science
An element cannot be broken down into any other substances with other properties.
Each element is composed of
atoms
three neutrons
element
An atom is the smallest component that maintains the chemical properties of the element.
Each atom has a nucleus with
protons
neutrons
electrons
proteins
chemicals
An element will always have the same number of
nuclei
An element can have different numbers of neutrons or electrons.
Isotopes _.
can have different numbers of neutrons
can have different numbers of electrons
can change its behavior
can be radioactive
cannot be radioactive
Ions are positively charged.
Ions are atoms that can gain or lose
A pH scale
measures oxygen
measures hydrogen
measures carbon
measures nitrogen
Hydrogen ions and whether they are acidic or basic is
counted on a balance
measured on a pH scale
measured on a pH ruler
oberserved
Molecules are _.
the combination of two or more atoms
the combination of two atoms
the combination of four of the same atoms
Molecules composed of two or more different elemets are called compounds.
Organic compounds are
Carbon atoms bonded to hydrogen atoms
Hydrogen atoms bonded to hydrogen atoms
Carbon atoms bonded to carbon atoms
Nitrogen atoms bonded to carbon atoms
Polymers are long chains of repeated molecules.
Hydrocarbons are
compounds of hydrogen and carbon
compounds of hydrogen and nitrogen
compounds of carbon and nitrogen
Macromolecules are
Large molecules
Small molecules
Medium molcules
Microscopic molecules
What are three essential macromolecules?
Carbohydrates
Nucleic acids
Lipids
Proteins
Proteins are made up of chains of amino acids.
Amino acids do not determine the identity of proteins.
Amino acids
Store energy
Transport substances
Provide structural support
Produce tissue
Amino acids are the building blocks of life.
Nucleic acid direct protein production.
Nucleic acid carries
protein information
genetic information
mental information
carbohydrate information
What are the two types of nucleic acid?
DNA
RNA
RDNA
CNA
Carbohydrates are
simple sugars
complex sugars
simple proteins
nucleic acids
What are the two major types of energy?
Combustion energy
Potential energy
Wind energy
Kinetic energy
Potential energy is the energy of
position
motion
Kinetic energy is the energy of
poisition
wind
Chemical energy is potential energy in the bonds of atoms.
Why is it important to have energy?
To do anything
To run
To do nothing
In the First Law of Thermodynamics, energy cannot be created or destroyed, but can change forms.
In the Second Law of Thermodynamics,
the nature of energy will change from a more ordered state to a less ordered state
the nature of energy will change from a less ordered state to a more ordered state
The Earth's energy comes from the moon.
Autotrophs are also know as consumers.
Autotrophs are known as producers.
Autotrophs
Use the sun's energy to produce their own food
Use the sun's energy to decompose
Do not use the sun's energy to produce their own food
turn chemical energy into light energy
turn light energy into chemical energy
turn light energy into soil
turn chemical energy into wind energy
In photosynthesis, carbon dioxide and water are converted into sugars.
The components of photosynthesis are
Carbon dioxide
Shade
Sunlight
Soil
Sugar
Nitrogen
Oxygen
Heterotrophs can produce their own food.
What are the components of cellular respiration?
Energy
Monoxide
CO2
Energy is kept as heat in a one-way flow through the system.
An ecosystem is all of the organisms and non-living entities in a particular area at the same time
Primary production is the
conversion of solar energy to sugars
conversion of sugars to solar energy
conversion or water to gas
conversion of solar energy to wind energy
Gross primary production is the
use of energy made by the heterotrophs themselves
use of energy made by the plants themselves
use of atoms made by the plants themselves
Net primary production is energy left over to put into biomass.
All ecosystems produce biomass at the same rate.
Elements and compounds are consumed and required for survival of organisms.
Nitrogen has
7 protons, 7 neutrons
4 protons, 7 neutrons
4 protons, 4 neutrons
Phosphorus has
15 protons, 15 neutrons
17 protons, 17 neutrons
Oxygen has
7 protons, 8 neutrons
8 protons, 8 neutrons
Carbon has
7 protons, 6 neutrons
6 protons, 6 neutrons
6 protons, 7 neutrons
Carbon dioxide is a colorless gad used by plants for photosynthesis, given off by repiration, and released by burning fossil fuels.
Ionic bonds are
chemical bonds formed by the attraction between positively charged ions.
chemical bonds formed by the attraction between oppositely charged ions.
chemical bonds formed by the attraction between negatively charged ions.
chemical bonds formed by the attraction between neutrally charged ions.
A watershed is the entire area of a river from when a pipe drains into an ocean.
Hypoxia is the condition of extremely low dissolved oxygen concentrations in a body of water.
A covalent bond is a chemical bond formed by atoms "sharing" electrons.
What is a solution?
A mixture of substances in which elements, molecules, or compounds come together without chemically bonding.
A mixture of substances in which elements, molecules, or compounds come together with an ionic bond.
Plasma
Methane is a colorless gas produced primarily by anaerobic decomposition.
The ozone
is a molecule consisting of three oxygen atoms
absorbs ultraviolet radiation in the atmosphere
absorbs ultraviolet radiation in the stratosphere
is a molecule consisting of four oxygen atoms
What happens in biogeochemical cycles?
Nutrients cycle through the stratosphere, hydrosphere, and lithosphere.
Chemicals cycle through the atmosphere, hydrosphere, and lithosphere.
Nutrients cycle through the atmosphere, hydrosphere, and lithosphere.
What is a flux?
Movement among ponds
Movement among reservoirs
Movement among oceans
A source is a reservoir that releases more nutrients than they accept
In a sink, the reservoir accepts more than it releases.
What are the three forms of the hydrolytic cycle?
liquid
plasma
gas
solid
Water gets into the atmosphere only by evaporation.
What is transpiration?
Evaporation from plants
Evaporation from snow
Evaporation in general
Runoff is water flowing over land.
Human have only impacted some aspects of the water cycle.
How have we impacted the water cycle?
Overfilled water sources
Decreased evaporation
Depleted water sources
Reduced transpiration
Increased transpiration
Increased evaporation
Carbon is a part of every living thing.
Producers pull _ from the atmosphere.
H2O
N
K
Producers put some CO2 back into the atmosphere.
CO2 becomes incorporated into the tissues of _ and _.
plants, air
plants, insects
animals,insects
plants,animals
Settles into _ when organisms die.
Sediment
Plants
What is the largest reservoir of carbon?
Air
Putting too much CO2 into the air is a major climate change argument.
Shifted from _ to atmosphere.
hydrosphere
lithosphere
stratosphere
Nitrogen makes up how much of our atmosphere?
48%
78%
88%
76%
Nitrogen is essential.
Nitrogen needs what to help itself cycle.
Bacteria
Thunder
Lightning
Atoms
How many steps are in the nitrogen cycle?
3
2
4
6
Nitrogen has to be "fixed" before it can be used.
Through what step of the nitrogen cycle do plants take up nitrates?
Deneitrification
Nitrification
Nitrogen fixation
How have humans impacted the nitrogen cycle?
Reduced plants
Reduced bacteria
Increased amount of nitrogen in soils and water through fertilizer.
Increased amount of nitrogen in soils and water through new plants.
Phosphorus is found in the atmosphere.
The majority of phosphorus is found in
rocks
plants
animals
water
When rocks are weather, the phosphorus runs into the water and
settles into the sediment
settles into plants
settles into fish
is dissolved
Plants do not take up phosphorus.
How have humans impacted the phosphorus cycle?
Mined rocks
Put phosphorus in fertilizers
Taken phosphorus out of fertilizers
Detergents