IGCSE Biology Key Words Flashcards
Nutrition (What nutrition do plants and animals need?)
The 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
Excretion
The removal from organisms of waste products of metabolism (chemical reactions in cells including respiration), toxic materials and substances that are in excess of requirements
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 respond appropriately
Reproduction
The processes that make more of the same kind of organism
Growth
A permanent increase in size and dry mass by an increase in cell number or cell size, or both
Movement
An action by an organism or part of an organism causing a change of position or place
Species
A group of organisms that can reproduce to produce fertile offspring
Binomial system
An internationally agreed system in which the scientific name of an organism is made up of two parts: the genus and the species
Tissue
A group of cells with similar structure working together to perform a shared function (job)
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
