Act General Science Strategies Ch.9

Front 1

Cell

Back 1

the lowest-level structure of any living organism that can preform all of the functions of life, including reproduction.

Front 2

Chlorophyll

Back 2

the main pigment in plants that captures light energy during photosynthesis.

Front 3

Compound

Back 3

a substance composed of two or more chemically bonded elements.

Front 4

Concentration

Back 4

the exact amount of substance dissolved in a given amount of solvent; refers to a solution.

Front 5

Condensation

Back 5

the process whereby a decrease in energy causes vapor particles to return to a liquid phase.

Front 6

Conductor

Back 6

a material that allows heat or electricity to flow through it with minimal resistance.

Front 7

Control

Back 7

a sample in which no variables are tested, thus serving as a basis for comparison.

Front 8

Control Variable

Back 8

a variable that stays constant in an experiment, allowing the effect of another variable to be measured.

Front 9

Convection

Back 9

the circulation of fluid caused by warm fluid rising and fluid sinking.

Front 10

Density

Back 10

in a physics sense, the amount of mass per unit volume; in a more general sense, the quantity per unit area or volume.

Front 11

Conductor

Back 11

a material that allows heat or electricity to flow through it with minimal resistance.

Front 12

Control

Back 12

a sample in which no variables are tested, thus serving as a basis for comparison.

Front 13

Control Variable

Back 13

a variable that stays constant in an experiment, allowing the effect of another variable to be measured.

Front 14

Convection

Back 14

the circulation of fluid caused by warm fluid rising and fluid sinking.

Front 15

Density

Back 15

in a physics sense, the amount of mass per unit volume; in a more general sense, the quantity per unit area or volume.

Front 16

Convection

Back 16

the circulation of fluid caused by warm fluid rising and cool fluid sinking.

Front 17

Density

Back 17

in a physics sense, the amount of mass per unit volume; in a general sense, the quantity per unit area or volume.

Front 18

Diffusion

Back 18

the scattering of light; the scattering of liquid or gas from areas of higher concentration to areas of lower concentration.

Front 19

DNA

Back 19

nucleic acid in the cells of an organism, contains the genes of an organism and transmits these to future generations.

Front 20

Ecological Succession

Back 20

a sequence of changes in the plant and or animal life of a region over time.

Front 21

Electron

Back 21

a negatively charged fundamental atomic particle.

Front 22

Element

Back 22

a substance consisting of exactly one type of atom.

Front 23

Erosion

Back 23

wearing away; typically the washing away of sands or rock by running water or wind.

Front 24

Evaporation

Back 24

the changing of liquid into a gas.

Front 25

Fossil

Back 25

the preserved remains of a very old organism.

Front 26

Frequency

Back 26

the number of cycles per unit time of a repeating phenomenon.

Front 27

Glucose

Back 27

a simple sugar that is broken down to provide energy to a organism.

Front 28

Habitat

Back 28

the part of an ecosystem where a plant or an animal naturally grows or lives.

Front 29

Herbivore

Back 29

an animal that eats only plants.

Front 30

Hormone

Back 30

a chemical substance secreted by a gland of the body that affects other parts of the body.

Front 31

Humidity

Back 31

the amount of water vapor in the air.

Front 32

Hypothesis

Back 32

a statement that is a proposed explanation of scientific phenomenon.

Front 33

Infrared Radiation

Back 33

electromagnetic waves whose wavelength is longer than that of visible light.

Front 34

Insulator

Back 34

a substance that blocks the flow of heat or electricity.

Front 35

Ion

Back 35

a molecule or atom that has become charged by either gaining or losing an electron.

Front 36

Isotope

Back 36

a variety of an element with the same number of protons per atom but a different number of neutrons.

Front 37

Kinetic Energy

Back 37

the energy of an object due to its motion.

Front 38

Melting Point

Back 38

the temperature at which additional thermal energy breaks the chemical bonds holding a substance together and causes the substance to change from the solid to the liquid state.

Front 39

Molecule

Back 39

the smallest unit of a chemical compound.

Front 40

Neutron

Back 40

a fundamental atomic particle that has no charge.

Front 41

Ore

Back 41

a piece of rock from which metal can be profitably extracted.

Front 42

Osmosis

Back 42

the movement of liquid through a membrane.

Front 43

Parasite

Back 43

an organism that invades another organism (its host) and feeds off the host.

Front 44

pH

Back 44

a numerical scale from 1-14 representing the acidity or alkalinity of a solution. 1=very acidic, 14=very alkaline, and 7 is neutral.

Front 45

Photosynthesis

Back 45

the process in which plants use the sun's energy to convert carbon dioxide and water into glucose.

Front 46

Pressure

Back 46

force per unit area.

Front 47

Protein

Back 47

a complex molecule composed of amino acids that carries out a variety of processes in cell.

Front 48

Proton

Back 48

a positively charged fundamental atomic particle.

Front 49

Starch

Back 49

a complex carbohydrate found in potatoes, rice, corn, and many other vegetables.

Front 50

Symbiosis

Back 50

a close relationship between two organisms that is mutually beneficial.

Front 51

Ultraviolet Radiation

Back 51

Electromagnetic waves with wavelength shorter than that of a visible light.

Front 52

Vapor

Back 52

the gaseous form of a liquid.

Front 53

X ray

Back 53

electromagnetic radiation with wavelength shorter than ultraviolet radiation.