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Chapter 2 Vocab
Chapter 2 Vocab Quiz 10-14
28
Science
9th Grade
10/13/2010

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Term
Energy
Definition
The capacity to work or cause change.
Term
2 Types of energy
Definition
Chemical, free
Term
Free energy
Definition
The portion of chemical energy that is available to do work.
Term
Uses of free energy
Definition
chemical work, mechanical work, transport, constructing and breaking down large molecules, organizing molecules into cells, movement and concentration of raw materials.
Term
Heterotrophs
Definition
organisms that obtain energy and nutrients from other organisms
Term
Autotrophs
Definition
organisms that obtain energy and nutrients from nonliving sources
Term
Photoautotrophs
Definition
organisms that capture energy using photosynthesis
Term
Chemoautotrophs
Definition
organisms that obtain energy from inorganic chemicals in the environment.
Term
Chemical energy is traced to ________
Definition
solar energy
Term
cellular respiration
Definition
chemical reactions that release the free energy of organic compounds
Term
Producers
Definition
autotrophs which produce food other organisms use
Term
Consumers
Definition
Consume plants and other organisms for food
Term
Decomposers
Definition
break down and use dead plants and animals for food (release nutrients, no energy)
Term
Food web
Definition
flow of energy through the ecosystem
Term
Ecosystem is composed of ____________
Definition
biotic factors and abiotic factors
Term
biotic
Definition
living
Term
abiotic
Definition
nonliving
Term
Habitat
Definition
places where particular organisms live
Term
Biosphere
Definition
all ecosystems combine to make biosphere
Term
First law of thermodynamics/ law of conservation of energy
Definition
energy cannot be created or destroyed, but can change form
Term
Entropy
Definition
disorder
Term
Systems tend to change in a way that increases _______.
Definition
Entropy
Term
Energy is a key to maintaining ____________
Definition
organization
Term
Chemical energy
Definition
energy stored in the organic molecules from which organisms are made.
Term
nutrients
Definition
raw materials
Term
photosynthesis
Definition
the process of capturing energy from sunlight and using it to synthesize organic compounds from carbon dioxide and water
Term
chemosynthesis
Definition
the process of capturing energy by obtaining free energy from inorganic chemicals in the environment, which is stored as chemical energy and used for cellular work.
Term
Second law of thermodynamics
Definition
systems tend to change in a way that increases the disorder or entropy of the system plus its surroundings.
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