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Question : A prothallus is

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A structure in pteridophytes formed before the thallus develops 
A sporophytic free living structure formed in pteridophytes 
A gametophyte free living structure formed in pteridophytes 
A PRIMITIVE structure formed after fertilization in pteridophytes 

SOLUTION :Generally it is a gametophytic stage in pteridophytes. The spores germinate to give rise to PROTHALLUS. It is short-lived, UNCLEAR and heart shape structure. Rhizoids and egg appratus reproductive organs LIKE are produced on the horizontal surface of it.


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