grade 6 revision q3

Question 1

occurs when individuals join a population.

Answer 1

immigration

Question 2

occurs when individuals leave a population.

Answer 2

emigration

Question 3

is the maximum number of individuals of one species that the environment can support.

Answer 3

carrying capacity

Question 4

occurs when the carrying capacity for a population

suddenly drops.

Answer 4

population crash

Question 5

A part of the environment that keeps a population’s size at a level below its full potential

Answer 5

limiting factor

Question 6

When two or more individuals or populations try to use the same limited resource.

Answer 6

competition

Question 7

occurs when individuals work together.

Answer 7

cooperation

Question 8

A close long-term relationship between two different populations in a community

Answer 8

symbiosis

Question 9

A symbiotic relationship in which both organisms benefit

Answer 9

mutualism

Question 10

A symbiotic relationship in which one organism benefits while the other is unaffected

Answer 10

commensalism

Question 11

A symbiotic relationship in which one organism benefits and another is harmed

Answer 11

parasitism

Question 12

is the ability to do work.

Answer 12

energy

Question 13

is anything that has mass and takes up space.

Answer 13

matter

Question 14

the original source of energy in most ecosystems.

Answer 14

sun

Question 15

states that energy cannot be created or destroyed; it only changes from one form to another.

Answer 15

law of conservation of energy

Question 16

states that mass cannot be created or destroyed.

Answer 16

law of conservation of mass

Question 17

get energy by eating producers.

Answer 17

primary consumers

Question 18

get energy by eating primary consumers,

Answer 18

secondary consumers

Question 19

is a tool that can be used to trace the flow of energy

through an ecosystem.

Answer 19

energy pyramid

Question 20

The movement of water between the oceans, atmosphere, land, and living things

Answer 20

water cycle

Question 21

is caused by any material or condition that harms the

environment.

Answer 21

pollution

Question 22

occurs when a large fraction of a resource has

been used up.

Answer 22

resource depletion

Question 23

Human population growth in and around cities

Answer 23

urbanization

Question 24

An increase in the amount of nutrients, such as nitrates, in an aquatic ecosystem

Answer 24

eutrophication

Question 25

is the protection and wise use of natural resources.

Answer 25

conservation

Question 26

the smallest particle into which an element can be divided and still be the same element.

Answer 26

atom

Question 27

thought that matter could be divided into | smaller units until you obtain a particle that cannot be divided anymore.

Answer 27

Democritus

Question 28

published an atomic theory, stating that all | matter is made up of atoms that cannot be created, divided, or destroyed.

Answer 28

John Dalton

Question 29

provided evidence that atoms contain negatively charged particles, which were later called electrons.

Answer 29

J.J Thomson

Question 30

suggested that atoms have a nucleus - a small, dense center that has a positive charge.

Answer 30

Ernest Rutherford

Question 31

suggested a model in which electrons move around the nucleus in circular paths.

Answer 31

Niels Bohr

Question 32

discovered that the nucleus contains uncharged | particles called neutrons.

Answer 32

James Chadwick

Question 33

the positively charged particles of atoms.

Answer 33

protons

Question 34

are particles that have no electrical charge.

Answer 34

Neutrons

Question 35

The negatively charged particles of an atom

Answer 35

electrons

Question 36

The number of protons in the nucleus of an atom

Answer 36

atomic number

Question 37

The total number of protons and neutrons in an atom’s nucleus

Answer 37

mass number

Question 38

atoms of the same element that have different | numbers of neutrons.

Answer 38

Isotopes

Question 39

is any natural material that is used by humans.

Answer 39

Natural resource

Question 40

is a natural resource that can be replaced at | the same rate at which it is consumed.

Answer 40

renewable resource

Question 41

is a resource that forms at a rate much | slower than the rate at which it is consumed.

Answer 41

non-renewable resource

Question 42

is a nonrenewable resource formed from the | buried remains of plants and animals that lived long ago.

Answer 42

fossil fuel

Question 43

Natural resources that are used to make objects, food, or drink

Answer 43

material resources

Question 44

removes electrons from hydrogen atoms, and electron | movement generates electrical energy.

Answer 44

the fuel cell

Question 45

is an exact quantity that people agree to use to | compare measurements.

Answer 45

standard

Question 46

the distance between two points.

Answer 46

length

Question 47

The amount of space occupied by an object

Answer 47

volume

Question 48

the quantity of matter in an object.

Answer 48

mass

Question 49

mass per unit volume of a material.

Answer 49

Density

Question 50

is a measure of how hot or how cold something is.

Answer 50

Temperature

Question 51

the interval between two events.

Answer 51

Time