AQA Ks3 Science K/Ws revision

Accuracy

How close data is to true values.

1 of 158

Aerobic respiration

respiration that involves oxygen.

2 of 158

Alkali metals

The group 1 family of metals, which all react quickly with water.

3 of 158

Allele

Different forms of a gene, they can be recessive or dominant.

4 of 158

Alveoli (singular alveolus)

Where gas exchange occurs in the lungs.

5 of 158

Amplitude

Maximum displacement of a point on a wave from its undisturbed position.

6 of 158

Anaerobic respiration

Respiration without using oxygen.

7 of 158

Area

length × width; units are squared.

8 of 158

Armature

Pole in an electromagnet or moving iron part of a solenoid, such as an electric bell.

9 of 158

Asthma

Disease affecting the breathing system.

10 of 158

Atmosphere

The mixture of gases around the Earth.

11 of 158

Atom

Basic 'building block' of an element that cannot be chemically broken down.

12 of 158

Atomic number

Number of an element in the periodic table.

13 of 158

Attract

Pull towards; a magnet will attract any magnetic material that is close enough.

14 of 158

Balanced diet

Intake of foods that provide the correct nutrients in the correct proportions.

15 of 158

Balanced forces

Forces on an object that act in opposite directions and are equal in size.

16 of 158

Base (in biology)

Bases are joined together in pairs; these pairs are the components of DNA.

17 of 158

Bias

When evidence, or the conclusion from evidence, is swayed towards a certain outcome

18 of 158

Biodiversity

Variety of different organisms in an area.

19 of 158

Bond breaking

Overcoming the force of attraction between particles in a molecule. Energy is transferred during this process.

20 of 158

Bond making

The force of attraction between particles coming together in a molecule. Energy is transferred out during the process.

21 of 158

Breathing

The process of moving air in and out of the lungs.

22 of 158

Brewing

Cereal grains are soaked in water and fermented with yeast.

23 of 158

Bronchi

Bronchi are the main passageway into the lungs.There are two bronchi in the human body; each bronchus carries oxygen into and carbon dioxide out of a lung.They are part of the conducting zone of the respiratory system.

24 of 158

Bronchioles

The passageways in between the bronchi and alveoli- they allow air to pass into the alveolar sacs for gas exchange to occur.

25 of 158

Buoyancy

Upward force on an object in a liquid.

26 of 158

Capillary

Capillaries are the smallest of the body’s blood vessels. They are only one cell thick.

27 of 158

Carbohydrates

Food group including starch and sugars.The body breaks down (or converts) most carbohydrates into the sugar glucose, which is absorbed into the bloodstream.

28 of 158

Carbon cycle

The way in which carbon atoms pass between living organisms and their environment.

29 of 158

Carbon sink

The ways of storing carbon so it isn't in the atmosphere are known as carbon sinks/carbon stores.

30 of 158

Carbonate

Type of compound containing carbon and oxygen.

31 of 158

Catalyst

Substance that alters the rate of a chemical reaction.

32 of 158

Catalytic converter

A system that converts pollutant gases into harmless ones using a catalyst.

33 of 158

Cellulose

Large sugar moleucle made by plants for its cell walls.

34 of 158

Ceramic

An inorganic, non-metallic solid prepared by heating and then cooling substances such as clay.

35 of 158

Chemical bond

The force of attraction between two atoms.

36 of 158

Chemical digestion

Breakdown of food by enzymes in the digestive system.

37 of 158

Chemical formula

Chemical symbols and numbers that show which elements, and how many atoms of each, a compound is made from.

38 of 158

Chemical properties

The way that elements and compounds react with other chemicals and compounds.

39 of 158

Chemical reaction

A process in which one or more substance are changed into others, by their atoms being rearranged.

40 of 158

Chlorophyll

Green pigment in plants used in photosynthesis.

41 of 158

Chromosomes

In the nucleus of each cell, the DNA molecule is packaged into thread-like structures called chromosomes. Each chromosome is made up of DNA tightly coiled many times around proteins called histones that support its structure.

42 of 158

Cilia

Tiny hair-like structures that help to keep mucus and dust out of the lungs.

43 of 158

Circuit beaker

Device that breaks a circuit when a current too high flows.

44 of 158

Claim

An assertion that something is true without it yet being widely accepted.

45 of 158

Combustion

Reaction of fuels with oxygen that transfers thermal energy to the surroundings. A fuel, heat and enough oxygen is needed for complete combustion.

46 of 158

Compass

Turns to show the direction of a magnetic field.

47 of 158

Competition

Struggle between different organisms for survival.

48 of 158

Composite

A material made from 2 or more different materials, each of these having very different properties.

49 of 158

Compression

A squishing or pushing together force.

50 of 158

Concentration

Amount of something per unit volume- for example sugar in water.

51 of 158

Conduct

Transfer of thermal energy in certain solids by the movement of particles or electrical charge through conducting materials.

52 of 158

Conduction

Transfer of thermal energy by the vibration of particles.

53 of 158

Conductor of heat

Material that allows thermal energy to be transferred through it easily.

54 of 158

Cone

Part of a loudspeaker that pushes on the air to create a sound.

55 of 158

Conserved

When the quantity of something does not change after a process takes place.

56 of 158

Contact (electrical)

Point at which a circuit is made, e.g. switch.

57 of 158

Contact force

Force arising when objects are touching-e.g. friction.

58 of 158

Continuous

A variable for which you can select any value.

59 of 158

Control variable

Factor kept constant in an investigation.

60 of 158

Convection

The movement caused in a fluid when hotter(less dense) material rises, and colder (denser), material sinks under the influence of gravity, resulting in the transfer of thermal energy.

61 of 158

Core(of electromagnet)

Piece of iron inside the coil of an electromagnet which makes the magnetic field stronger.

62 of 158

Correlation

How well sets of data are linked; high correlation shows that there is a strong link between two sets of data.

63 of 158

Crest

The point on a wave that exhibits the maximum amount of positive or upward displacement from the original position.

64 of 158

Cuticle

Waxy waterproof layer on the upper-side of a leaf.

65 of 158

Deficiency

Lack of something.

66 of 158

Deficiency disease

Illness caused by lack of a certain nutrient.

67 of 158

Deformation

Change of shape.

68 of 158

Degrees Celsius

Degrees Celsius is a measure of temperature; pure water freezes at 0 degrees C and boils at 100.

69 of 158

Density

Mass of a material per unit volume.

70 of 158

Dependent Variable

A dependent variable is the variable being tested and measured in a scientific experiment.

71 of 158

Depth

Distance below the surface of a liquid.

72 of 158

Diaphram

Muscular layer at the base of the chest cavity.

73 of 158

Dietary Fiber

The indigestible portion of food derived from plants.

74 of 158

Diffusion

Particle movement that causes particles in a liquid or gas to spread out evenly.

75 of 158

Digestion

Breakdown of food in order to obtain energy.

76 of 158

Digestive System

Group of organs that together enable the digestion of food.

77 of 158

Discrete

A variable where only certain values are possible.

78 of 158

Displace

When an object is put into water it displaces some of the water.

79 of 158

Displacement

A chemical reaction in which one substance takes the place of another in a compound.

80 of 158

DNA

Deoxyribonucleic acid -the molecule in the nucleus of cells that carries genetic information.

81 of 158

Dominant (in an allele)

Controls the characteristic whether there are one or two copies present.

82 of 158

Double helix

The structure of the DNA molecule, like a twisted ladder.

83 of 158

Down-cycle

Loss of viability or value in a product as it is recycled.

84 of 158

Drag

Resistant force of air or water.

85 of 158

Ecosystem

A habitat and all the living things in it.

86 of 158

Electrolysis

Chemical process that involves separating compounds using electricity.

87 of 158

Electromagnet

Type of temporary magnet that is magnetic only when an electric current passes through it.

88 of 158

Element

Substance made up of only one type of atom.

89 of 158

Endangered

When there are so few of a species left that it could disappear altogether and become extinct.

90 of 158

Endothermic reaction

Chemical reaction in which thermal energy is transferred in.

91 of 158

Energy

Something has energy if it has the ability to make something happen when that energy is transferred.

92 of 158

Energy transfer

The quantity of energy transferred in a change which can be measured.

93 of 158

Enzyme

Substance that enables a chemical process in the body.

94 of 158

Epidermis

Single-cell thick transparent layer in the upper surface of a leaf.

95 of 158

Equilibrium (chemistry)

A stable state, in which no change is occurring; (in ecology) balance between predators and prey in an environment.

96 of 158

Evolution

The change in a species over a long period of time.

97 of 158

Exothermic

Term for a chemical reaction in which energy is given out,causing a warming of the surroundings.

98 of 158

Exothermic reaction

Chemical reaction in which thermal energy is transferred into the surroundings.

99 of 158

Extinction

The process of a species dying out.

100 of 158

Extraction

Separating something from its previous location, possibly as a purification process,such as extracting a metal from its ore.

101 of 158

Fermentation

A type of respiration in micro-organisms such as bacteria.

102 of 158

Fertiliser

Chemical put on soil to increase soil fertility and allow better growth for crop plants.

103 of 158

Field

Area of electrostatic force around an object charged with static electricity.

104 of 158

Fluid

A substance that will flow. Liquids are an obvious example and the term is sometimes assumed to be liquid, but, in fact, fluids include gases as well as liquid.

105 of 158

Food group

Type of food, such as protein, is needed for certain body processes.

106 of 158

Force

push, pull, shear or turning effect; forces can be contact or non-contact.

107 of 158

Fossil fuels

Coal, natural gas and crude oil are fossil fuels which are formed from the compressed remains of plants and other organisms that died millions of years ago.

108 of 158

Frequency (waves)

Number of waves passing a set point, or emitted by a source, in a second.

109 of 158

Friction

A force that opposes movement.

110 of 158

Fuel

Material that is burned for the purpose of generating heat.

111 of 158

Gamete

The male or female sex cell(sperm or egg.)

112 of 158

Gene

A section of DNA that controls an inherited feature.

113 of 158

Gene Bank

A store of genetic material (such as seeds) that can be used in the future to grow more organisms.

114 of 158

Genetic diagram

Used to show the possible outcomes of a particular cross. A dominant allele is shown by a capital letter, and a recessive allele by a lower case letter.

115 of 158

Global warming

Increase in the Earth's temperature due to increasing amounts of carbon dioxide and other greenhouse gases in the atmosphere.

116 of 158

Glucose

A simple sugar molecule.

117 of 158

Glycogen

Glucose molecule linked in a long chain; does not dissolve in water so can be stored in the body, especially in the liver.

118 of 158

Greenhouse effect

The trapping of the Sun's infrared radiation by the Earth's atmosphere.

119 of 158

Group

Vertical column of elements in the periodic table.

120 of 158

Gut bacteria

Bacteria which naturally live in the gut.

121 of 158

Halogen

A group of non-metal elements to the right of the periodic table, that includes chlorine; group 7.

122 of 158

Hazard

Something that can cause harm.

123 of 158

Height

The vertical distance from the ground to the top of an object (if it is stood on the ground) or to the object (if it is suspended above the ground).

124 of 158

Hertz (Hz)

A unit of frequency (1 Hz = 1 wave per second)

125 of 158

Hypothesis

Idea that explains a set of facts or observations, and is the basis for possible experiments.

126 of 158

Identical twins

Twins that are developed from a single egg and share the same genetic information.

127 of 158

Independent variable

An independent variable is the variable that is changed or controlled in a scientific experiment to test the effects on the dependent variable.

128 of 158

Inherited characteristics

A feature or characteristic that has been passed on genetically.

129 of 158

Input force

The amount of effort put in.

130 of 158

Insulation

A substance that will reduce how quickly thermal energy is transferred (thermal insulator) or will resist the flow of current (electrical insulator).

131 of 158

Electrical insulator

Does not allow a current to pass.

132 of 158

Interval

A clock breaks time down into intervals of seconds, minutes, and hours. An interval is a distinct measure of time or the physical or temporal distance between two things.

133 of 158

Iodine

Orange-colored liquid used to test for starch.

134 of 158

Karotype

The number and appearance of the chromosomes in a cell nucleus.

135 of 158

Joule

The joule is the standard unit of energy in electronics and general scientific applications. One joule is defined as the amount of energy exerted when a force of one newton is applied over a displacement of one meter.

136 of 158

Kilojoule (kj)

1000 jules.

137 of 158

Lactic acid

Substance produced during anaerobic respiration; builds up in muscles during vigorous exercise and causes an aching or burning feeling in the muscles.

138 of 158

Landfill

A site where rubbish or waste is dumped.

139 of 158

Large intestine

The portion of the intestine that extends from the ileum to the anus.

140 of 158

Lever

Simple machine that uses the turning effect of a force about a pivot.

141 of 158

Limit

An extreme value; going beyond the limit may cause a pattern or relationship between factors to break down.

142 of 158

Linear relationship

A relationship between two variables such that changing the independent variable causes the same change in the dependent variable; e.g. doubling the the first causes the second to double.

143 of 158

Lipids

Fat and oils; large molecules made from smaller units of fatty acids and glycerol.

144 of 158

Longitudinal wave

A wave in which the oscillation is parallel to the direction of energy transfer.

145 of 158

Loudspeaker

Apparatus that converts electrical impulses into sound.

146 of 158

Lung volume/vital capacity

The amount of air that you can breathe out following a big breath in.

147 of 158

Machine

Apparatus using mechanical power.

148 of 158

Magnetic field

Space in which a magnetic material feels a force.

149 of 158

Malnutrition

Health condition caused by insufficient intake of nutrients.

150 of 158

Manure

Waste organic material.

151 of 158

Mass extinction

The extinction of a large number of species at the same time.

152 of 158

Medium

Material through which something, such as sound, travels.

153 of 158

Melting point

Temperature at which solid changes state to a liquid.

154 of 158

Metals

Shiny, good conductor of electricity and heat, malleable and ductile, and usually solid at room temperature.

155 of 158

Microbe

Tiny organism that cannot be seen with the naked eye; includes bacteria, viruses and fungi.

156 of 158

Microphone

Device for changing sound into an electrical signal.

157 of 158

Minerals

Chemicals from which rocks are made.

158 of 158

Get Revising

AQA Ks3 Science K/Ws revision

Other cards in this set

Card 2

Front

Back

Card 3

Front

Back

Card 4

Front

Back

Card 5

Front

Back

Comments

Similar Other resources:

Other cards in this set

Card 2

Front

Back

Card 3

Front

Back

Card 4

Front

Back

Card 5

Front

Back

Comments

Related discussions on The Student Room

Similar Other resources: