Page 50 - ICC Science Dictionary (spreads)

Word Definition Topic(s) Word Definition Topic(s)

plant Substances that can modify or B1a, B1b pollutant A toxic chemical or object that C9, C10
hormones control the growth of plants. causes damage to the land, air or

plasma A state of matter achieved by P4 water.
heating a gas to the point where pollution Contaminating the air, water or B7a, B7b
electrons gain enough energy to ground with harmful substances.
leave their electron orbits. polymer A large molecule formed from TC4, B2, C2,
plasmid The small circular genetic material B6 many identical smaller molecules C7, C10
present in bacterial cells and used known as monomers.
in DNA recombinant technology. polymerisa- Reaction in which monomer C7
plasmolysed Description of a plant cell in which B1a, B1b tion reaction molecules combine together to
the vacuole has shrunk and the form larger polymer molecules.
membrane has pulled away polypeptide A short polymer made from C7
from the wall due to water loss by fewer than 50 amino acids. If the
osmosis. polymer contains more than 50
pleural Thin, moist membranes TB4, B2 amino acids, it is called a protein.
membranes surrounding the lungs that make population All of the members of a single TB2, TB6, B7a,
an airtight seal. species that live within a B7b
plot Mark on a graph using data given. Command geographical area.
word positively/ Although they are called amino B2
plotting Small magnetic compass used to P7 negatively 'acids', because of different
compass detect magnetic fields. charged chemical groups that they
plum An early model of the atom in C1 amino acids contain, some amino acids may
pudding which an atom is a ball of positive carry an overall negative or a
model charge with negative electrons positive charge.
embedded in it. potable Water that is safe to drink. C10
pollen Contains the plant male sex cells TB2 potential The potential difference (or P1, P2, P7
found on the stamens. difference voltage) of a supply is a measure
pollination Transfer of pollen from the male TB2 of the energy given to the charge
part of the flower to the female carriers in a circuit. Units = volts
part of the flower on the same or (V). This is the voltage between
another plant. two points that makes an electric
current flow between them.