Ncert Exercises & Solutions

A prothallus is

1.	a structure in pteridophytes formed before the thallus develops
2.	a sporophytic free living structure formedin pteridophytes
3.	a gametophyte free living structure formed in pteridophytes
4.	a primitive structure formed after fertilisation in pteridophytes

Prothallus is usually a gametophytic stage in the life of a Pteridophyte. Spore germinates to form a prothalium, it is short lived inconspicuous heart shaped structure with a number of rhizoids developed beneath and sex organs, archegonium and antheridium.

Page 38, XI NCERT

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