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Summary IGCSE Biology Definiton List
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Summarized IGCSE Biology Definitons
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BIOLOGY DEFINITIONS Movement: an action by an organism or part of an organism causing a change of
position or place
Respiration: the chemical reactions in cells that break down nutrient molecules and
release energy for metabolism
Sensitivity: the ability to detect or sense stimuli in the internal or external
environment and to make appropriate responses
Growth: a permanent increase in size and dry mass by an increase in cell number or
cell size or both
Excretion: removal from organisms of the waste products of metabolism (chemical
reactions in cells including respiration), toxic materials, and substances in excess of
requirements
Nutrition: taking in of materials for energy, growth and development; plants require
light, carbon dioxide, water and ions; animals need organic compounds and ions and
usually need water
Reproduction: the processes that make more of the same kind of organism
Species: a group of organisms that can reproduce to produce fertile offspring
Binomial system of naming species: an internationally agreed system in which the
scientific name of an organism is made up of two parts showing the genus and
species
Tissue: a group of cells with similar structures, working together to perform a shared
function
Organ: a structure made up of a group of tissues, working together to perform
specific functions
Organ system: a group of organs with related functions, working together to
perform body functions
Diffusion: the net movement of particles from a region of their higher concentration
to a region of their lower concentration down a concentration gradient, as a result of
their random movement
Osmosis: the net movement of water molecules from a region of higher water
potential (dilute solution) to a region of lower water potential (concentrated solution),
through a partially permeable membrane
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