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Which of the following statements are correct w.r.t key ?
(I) They are analytical in nature
(II) They are based on contrasting characters in a pair called couplet
(III) Each statement in a key is called a lead
(IV) They are not separate for a family, genus and species

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III, IV

II, IV

I, II, III, IV

I, II & III

answer is C.

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Separate keys are needed for family, genus, and species

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