8/16/2019 Key Definitions for Igcse Biology

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Key definitions for igcse biology

1. Excretion : removal from organisms of toxic materials,theWaste product of metabolism ( chemical reactions

In cells including respiration and substances in

exess of re!uirements

". #ro$th : a permanent increase in si%e and dry mass by an

increase in cell number or cell si%e or both

&. 'ovement : an action by an organism or part of an organism

causing a change a change of position or place

. )utrition : the ta*ing in of nutrients $hich are organic

substances and mineral ions containing ra$ materials or energy for 

gro$th and tissue repair , absorbing and assimilating them