Question

Select the correct statement w.rt, taxonomical aid which is generally analytical in
nature
(1) Serve as quick referral system
(2) Specimens are preserved in preservative solutions
(3) Are based on contrasting characters in a pair called couplet
(4) Contain collection of living plants for reference

Answer 1

Answer:

3rd - KEYS - ARE BASED ON CONTRASTING CHARACTERS IN A PAIR CALLED COUPLET.