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GCSE Biology · key term
An organism in or on which a parasite lives and from which the parasite obtains resources.
Used by AQA, Edexcel and OCR
Specification 4.3.1.1, 4.3.1.5 · Paper 1
A living thing in or on which a pathogen obtains suitable conditions and nutrients to survive or reproduce.
Revise: Infectious Disease SpreadPathogens depend on a host for suitable conditions and nutrients.
An organism in or on which a pathogen lives and reproduces.
When asked how a disease spreads, name the route and describe the pathogen's journey from an infected source to a new host.
For parasitism, explain both sides: the parasite gains a resource while the host is harmed.
Classify an interaction by its effect on each species: mutualism benefits both; parasitism benefits the parasite but harms the host; predation benefits the predator and harms the prey.
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Specification 5.4, 9.4 · Paper 1, Paper 2
An organism whose cells or resources are used by another organism or by a virus.
Revise: PathogensThe word pathogen describes what something does: it causes disease in a host. It does not mean that every microorganism is harmful. Many bacteria, fungi and protists are harmless, and some are useful.
Specification B4.1g · Paper 2 (Foundation), Paper 4 (Higher)
An organism in or on which a parasite lives and from which it obtains resources.
Revise: Interdependence and competitionA parasite lives in or on another organism, called its host, and takes resources from it. The parasite benefits, while the host is harmed. A tapeworm, for example, lives inside an animal’s intestine and absorbs nutrients from partly digested food, leaving fewer nutrients available to the host organism.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
An organism in or on which a pathogen lives and may reproduce.
Revise: Spread of DiseaseAnimals and plants can all be hosts, and transmission can sometimes occur between different species.