Page 186 - Science Coursebook
P. 186
Glossary and index
cotyledons structures found inside endothermic process a process
some kinds of seeds, for example (such as a change of state) in which
beans, which store food for the energy is taken in from the environment 75, 77
young embryo 17
endothermic reaction a
decomposers organisms that chemical reaction in which energy is
break down organic matter, for taken in from the environment 74–77
example earthworms and fungi 30, 31
energy resource anything which
density property of an object or is a source of energy 162–165
material, calculated by density = environment anything in the
mass/volume 120–125 surroundings of an organism that
dispersed spread over a wide area 18, 23 affects it in any way 45, 47
displacement reaction a enzyme a biological catalyst that
reaction in which a more reactive speeds up a reaction in a living system 30, 117
metal ‘pushes out’ a less reactive one evaporation when a liquid
from a compound 88, 90
changes to a gas (a vapour) at a
DNA the chemical from which temperature below its boiling point 172, 173
genes and chromosomes are made; exothermic process a process
DNA carries a code of instructions (such as a change of state) in which
that determines how cells and energy is given out into the environment 76
organisms develop 48
exothermic reaction a chemical
ecologists people who study reaction in which energy is given out
the relationships between living into the environment 70, 72, 73, 76, 90
organisms and their environment 26, 27
extinct disappeared from the
ecology the study of living Earth; an extinct species is gone forever 36, 37
organisms in their environment 26, 27
fertilisation the joining together
electric charge a property of an of the nucleus of a male gamete and
object which causes it to attract or the nucleus of a female gamete 16, 49
repel other objects with charge 140–145, 150
fertilisers mineral ions that plants
electric current the movement of need for healthy growth, and that are
electric charge 147–151
added to the soil to help crops
electron a negatively charged grow better 8, 9, 34, 35
particle found surrounding the fossil fuels coal, oil and natural gas 162
nucleus of an atom 60, 62
friction the force that appears
electronic structure the when two objects try to slide over
arrangement of electrons in the shells each other 143
around the nucleus of an atom 62, 65
fruit a structure that contains
embryo a very young, new seeds; fruits develop from ovaries
organism, which has developed from after fertilisation, and often help the
a zygote 17, 18
seeds to be spread away from the
endangered at risk of becoming extinct 36 parent plant 18, 19
184
