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Comment on the life cycle and nature of fern prothallus.
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The life cycle of ferm (Dryopteris) clearly depicts the alternation of generation. The gametophytic stage $(n)$ alternates with the sporophytic stage $(2 n)$ in the life cycle as shown in the figure.
The prothallus of the fern is a multicellular, free living, thalloid, haploid and autotrophic structure. It develops from the spores produced by sporophyte after reduction division.
These spore germinate within a germtube with an apical cell and forms a filament of 3-6 cells and one or two rhizoids at the base which later develops into gametophytic plant.
The prothallus of the fern is a multicellular, free living, thalloid, haploid and autotrophic structure. It develops from the spores produced by sporophyte after reduction division.
These spore germinate within a germtube with an apical cell and forms a filament of 3-6 cells and one or two rhizoids at the base which later develops into gametophytic plant.
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