B1. Characteristics of living organisms Flashcards
Define ‘nutrition’
Taking in of nutrients which are organic substances and mineral ions, containing raw materials or energy for growth and tissue repair, absorbing and assimilating them.
Define ‘excretion’
Removal from organisms of toxic materials, the waste products of metabolism (chemical reactions in cells including respiration) and substances in excess of requirements.
Define ‘respiration’
The chemical reactions that break down nutrient molecules in living cells to release energy.
Define ‘sensitivity’
The ability to detect or sense changes in the environment (stimuli) and to make responses.
Define ‘reproduction’
The processes that make more of the same kind of organism.
Define ‘growth’
A permanent increase in size and dry mass by an increase in cell number of cell size or both.
Define ‘movement’
An action by an organism or part of an organism causing a change of position or place.
