Chapter 4 Science

Front 1

organism

Back 1

living things such as plants, animals,and bacteria.

Front 2

cell

Back 2

basic unit of an organism

Front 3

structure

Back 3

describes how something is made

Front 4

function

Back 4

describes the specific job or duty of the cell.

Front 5

stimulus

Back 5

something that causes a reaction in an organism

Front 6

external stimulus

Back 6

something that causes a reaction in an organism that happens oustide of the organism such as being hit with a ball on the head.

Front 7

internal stimulus

Back 7

something that causes a reaction in an organism that happens inside of the organism such as hunger or thirst.

Front 8

response

Back 8

reaction in the organism that happens because of a stimulus

Front 9

reproduce

Back 9

to create new offspring or children in organisms

Front 10

spontaneous generation

Back 10

creation of life from non living matter

Front 11

autotroph

Back 11

organisms that make their own food through photosynthesis.

Front 12

heterotroph

Back 12

organisms that can not make their own food and must eat other organisms for food

Front 13

homeostasis

Back 13

the process of an organism to keep internal eqilibrium or balance in response to external factors

Front 14

microscope

Back 14

an instrument that allows you to see objects too small to see with the unaided or naked eye.

Front 15

compound microscope

Back 15

a microscope with two or more objective lenses

Front 16

cell theory

Back 16

1 all living things are composed of cells
2 cells are the basic unit of structure and function in living things
3 all cells are produced from other cells

Front 17

magnification

Back 17

ability to make things look larger than they are

Front 18

resolution

Back 18

ability to clearly distinguish the individual parts of an object

Front 19

trait

Back 19

physical characteristics taht an organism can pass on to its offspring

Front 20

heredity

Back 20

process in which traits pass from parents to offspring

Front 21

DNA

Back 21

deoxyribonucleic acid - the genetic material taht carries information about an organism

Front 22

gene

Back 22

section of DNA that controls a trait that an organism inherits

Front 23

selective breeding

Back 23

technique used to improve the quality of organisms by selecting or choosing certain organisms for reproduction

Front 24

ecosystem

Back 24

all living and non living things that interact in a particular area

Front 25

habitat

Back 25

place where an organism lives and that provides that things the organism needs

Front 26

biotic factor

Back 26

living parts of an ecosystem

Front 27

abiotic factor

Back 27

non living parts of an ecosystem

Front 28

population chapter 8

Back 28

all members of one species in a particular area

Front 29

society

Back 29

closely related population of animals that work together for the benefit of the whole group

Front 30

community

Back 30

all the different populations that live together in a area

Front 31

ecology

Back 31

study of how living things interact with one another and with their enviroment

Front 32

producer

Back 32

autotrophs produce food and store energy such as flowers grass seaweed and cacti

Front 33

consumer

Back 33

heterotrophs taht obtain food and energy by eating other organisms

Front 34

decomposer

Back 34

some heterotrophs obtain energy by breaking down wastes and the remains of dead organism

Front 35

food chain

Back 35

DIAGRAM TO show the flow of energy from organsim to organism

Front 36

food web

Back 36

diagram that shows how many food chains are connected

Front 37

biomass

Back 37

total amount of living matter and the remains of dead organisms in an area