MCQ
Colour blindness in man is
- ADue of deficiency of vitamin $A$
- BDue of absence of visual purple in retina
- CDue to absence of rods in retina
- ✓A sex linked abnormality
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$\begin{array}{|l|l|} \hline Column-I & Column-II \\ \hline 1.\,\,Osculum & p.\,\,Fasciola \\ \hline 2.\,\,Hypostom & q.\,\,Ctenoplana \\ \hline 3.\,\,Comb\,\,jellies & r.\,\,Spongilla \\ \hline 4.\,\,Hook\,\,and\,\,sucker & s.\,\,Meandrina \\ \hline \end{array}$