Page 189 - Science Coursebook
P. 189
Glossary and index
resistor a component in an thermal conduction the transfer
electric circuit that reduces the of heat energy through a material,
current in the circuit 154, 155 without the material itself moving 166, 167
salt a compound formed when thermal conductor a material
a metal reacts with an acid e.g. which will allow heat to conduct through it 167
magnesium chloride 84, 94, 96
thermal insulator a material
sampling collecting data from which will not allow heat to conduct
a small part of a whole area, or through it 167
from just a small number of a large thermite reaction a reaction
number of individuals 26, 27 where aluminium displaces iron from
seed a structure that contains an iron oxide. This reaction can be used
embryo plant, and food stores to help to weld railway rails 90
it to begin to grow into a new plant 17 trial run a test run of an
selective breeding a process of investigation to check that you can
choosing individuals with desired carry out it out correctly 110
characteristics to breed together; it turning effect when a force
is generally continued for many causes an object to turn, it has a
generations 50, 51
turning effect 132
series circuit an electric circuit in variable resistor a resistor whose
which all components are connected resistance can be changed 154
end-to-end, one after another 149
variation differences between the
shells electronic shells are layers individuals in a species 44, 45
around the nucleus of an atom
where the electrons are arranged; the voltage a measure of the push of
electrons move about within their shell 62 a cell in a circuit; symbol V 152
species a group of organisms that voltmeter a meter used to
share the same features, and can measure voltage 152
breed together to produce fertile offspring 44 volume the amount of space
starch a type of carbohydrate that occupied by an object 120
is stored inside plant cells 6 water vapour a gas of water
static electricity effects produced molecules mixed into the air 10, 11, 172
by electric charges when they are not zooplankton microscopic animals
moving 140–145 that float in water 28
stigma the part of a flower that zygote the cell that is formed
receives pollen grains during pollination 15, 16 when a male gamete fuses with a
surface area the total area of the female gamete 16, 49
surface of an object 108
testa the tough, protective outer
covering of a seed 17
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