Unit 1 Flashcards
base unit for length
meter
long distance for length
kilometer
small lengths
centimeters
base unit for mass
gram
big units of mass
kilograms
base unit for volume
liter
the curved upper surface of a liquid in a tube
meniscus
a scientific explanation for a set of observations, an “educated guess”, must be testable, and an experiment will either support or reject the hypothesis
hypothesis
tests the effects of a single variable
controlled experiments
not treated with the independent variable
controlled experiment
treated with the independent variable
experimental group
a condition that changes
variable
the variable that is changed or manipulated
independent variable
responding variable that changes in response to the independent variable
dependent variable
data that is descriptive
qualitative data
data you can count
quantitative data
a well tested hypothesis, unifies observations and data, enables scientists to make accurate predictions
theory
the process in which organisms keep their internal conditions fairly constant
homeostasis
2 parents to create an offspring
sexual reproduction
copies DNA and split into two (1 parent)
asexual reproduction`
enlargement of the specimen, objective, ocular
magnification
multiply ocular by objective
total magnification
2 lenses, uses light rays, magnifies up to 2000x, good resolution, can view images .2 microns or larger, can view living specimens
compound light microscope
uses an electron beam, magnifies up to 2,000,000x, excellent resolution, can view images .2 microns or smaller, can only view dead specimens
electron microscope