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CH 1 Vocabulary
reviewer for exam
20
Biology
10th Grade
05/04/2008

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Term
asexual reproduction
Definition

the production of offspring that does notinvolve the

union of gametes

Term
sexual reproduction
Definition
hereditary information from two parts of a single

organism or from two organisms of the same species

Term
differentiation
Definition
the process by which cells become different from one another

through multiplying and following various genetic instructions

Term
ocular lens
Definition

in a microscope, the lens in the eyepiece

Term
multicellular organism
Definition

a living thing that consists of more than one cell

Term
unicellular organism
Definition

a living thing composed of one cell

Term
dependent variable
Definition

 the responding variable in an experiment

Term
independent variable
Definition

 an experimentally manipulated variable

Term
control group
Definition
in an experiment, a group or individual that serves as a standard

of comparison with another group or individual to which it is identical except for

one factor

Term
gene
Definition
a segment of DNA that contains coding for a polypeptide or protein; a

unit of hereditary information

Term
base unit
Definition
one of seven fundamental units of SI measurement that describe

length, mass, time, and other quantities

Term
ecosystem
Definition

 distinct environmental communities

Term
evolution
Definition
all the changes that have formed life on Earth from its earliest

beginnings to the diversity that characterizes it today

Term
natural selection
Definition
the theory that organisms that have certain favorable traits

are better able to successfully reproduce than organisms that lack these traits

Term
development
Definition

 the process by which an organism grows

Term
homeostasis
Definition

the stable internal conditions of a living thing

Term
hypothesis
Definition

 a statement that can be tested experimentally

Term
theory
Definition
a broad and comprehensive statement of what is believed to be true,

supported by considerable experimental evidence resulting from many tests of

related hypotheses

Term
ecology
Definition
the study of interactions of organisms with one another and with their

environment

Term
electron microscope
Definition
an instrument that uses a beam of electrons rather than a

beam of light to enlarge the image of an extremely small object so that it can be

seen

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