A Prothallus is
(a) A structure in pteridophytes formed before the thallus develops
(b) A sporophytic free living structure formed in pteridophytes
(c) A primitive structure formed after fertilisation in pteridophytes
(d) A gametophyte free living structure formed in pteridophytes
Ans. The answer is the option (d) A gametophyte free-living structure formed in pteridophytes