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Miss Aya's class > grade 6 revision q3 > Flashcards

grade 6 revision q3 Flashcards

1
Q

occurs when individuals join a population.

A

immigration

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2
Q

occurs when individuals leave a population.

A

emigration

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3
Q

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

A

carrying capacity

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4
Q

occurs when the carrying capacity for a population

suddenly drops.

A

population crash

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5
Q

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

A

limiting factor

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6
Q

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

A

competition

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7
Q

occurs when individuals work together.

A

cooperation

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8
Q

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

A

symbiosis

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9
Q

A symbiotic relationship in which both organisms benefit

A

mutualism

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10
Q

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

A

commensalism

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11
Q

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

A

parasitism

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12
Q

is the ability to do work.

A

energy

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13
Q

is anything that has mass and takes up space.

A

matter

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14
Q

the original source of energy in most ecosystems.

A

sun

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15
Q

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

A

law of conservation of energy

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16
Q

states that mass cannot be created or destroyed.

A

law of conservation of mass

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17
Q

get energy by eating producers.

A

primary consumers

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18
Q

get energy by eating primary consumers,

A

secondary consumers

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19
Q

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

through an ecosystem.

A

energy pyramid

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20
Q

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

A

water cycle

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21
Q

is caused by any material or condition that harms the

environment.

A

pollution

22
Q

occurs when a large fraction of a resource has

been used up.

A

resource depletion

23
Q

Human population growth in and around cities

A

urbanization

24
Q

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

A

eutrophication

25
Q

is the protection and wise use of natural resources.

A

conservation

26
Q

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

A

atom

27
Q

thought that matter could be divided into

smaller units until you obtain a particle that cannot be divided anymore.

A

Democritus

28
Q

published an atomic theory, stating that all

matter is made up of atoms that cannot be created, divided, or destroyed.

A

John Dalton

29
Q

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

A

J.J Thomson

30
Q

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

A

Ernest Rutherford

31
Q

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

A

Niels Bohr

32
Q

discovered that the nucleus contains uncharged

particles called neutrons.

A

James Chadwick

33
Q

the positively charged particles of atoms.

A

protons

34
Q

are particles that have no electrical charge.

A

Neutrons

35
Q

The negatively charged particles of an atom

A

electrons

36
Q

The number of protons in the nucleus of an atom

A

atomic number

37
Q

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

A

mass number

38
Q

atoms of the same element that have different

numbers of neutrons.

A

Isotopes

39
Q

is any natural material that is used by humans.

A

Natural resource

40
Q

is a natural resource that can be replaced at

the same rate at which it is consumed.

A

renewable resource

41
Q

is a resource that forms at a rate much

slower than the rate at which it is consumed.

A

non-renewable resource

42
Q

is a nonrenewable resource formed from the

buried remains of plants and animals that lived long ago.

A

fossil fuel

43
Q

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

A

material resources

44
Q

removes electrons from hydrogen atoms, and electron

movement generates electrical energy.

A

the fuel cell

45
Q

is an exact quantity that people agree to use to

compare measurements.

A

standard

46
Q

the distance between two points.

A

length

47
Q

The amount of space occupied by an object

A

volume

48
Q

the quantity of matter in an object.

A

mass

49
Q

mass per unit volume of a material.

A

Density

50
Q

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

A

Temperature

51
Q

the interval between two events.

A

Time

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