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Immunisation is the process of becoming "immune" to a pathogen, in other words once you are exposed to the pathogen again you won't become ill (present with the symptoms). After your body is exp...

The process begins when excess fertiliser, which has been used for farming, is flushed into rivers or lakes by rainwater. The fertiliser then provides nutrients such as nitrates which allow plant life in ...

A hormone is a chemical messenger which travels in the blood.  Hormones cause other tissues and organs to either produce other hormones or carry out chemical reactions. Water-soluble hormones cause this b...

Aseptic techniques prevent the contamination of a sample from other bacteria or pathogens. It is important to do this to ensure that the sample we are dealing with remains pure. Microorganisms are in the ...

• chloroplasts which are able to trap light so it can be used to generate energy through photosynthesis - cell wall which provides the plant cell with structure