Biology · Oct / Nov 2020 · Paper 41 · Question 6
0610
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Sensitivity is one of the characteristics of all living organisms.
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6(a)[2]
(the ability to) detect stimuli (in the internal / external environment) ;
to make (appropriate) responses ;
6(b)(i)[2]
groups of receptor cells ;
responding to specific stimuli ;
6(b)(ii)[3]
action
structure
relaxes
circular muscles (of the iris) ;
contracts
radial muscles (of the iris) ;
widens
pupil ;
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