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Question
Comment on the lifecycle and nature of a fern prothallus.
Solution
- Fern shows diplo-haplontic life cycle.
- Diploid sporophyte represents the dominant, independent, photosynthetic plant body.
- The sporophyte bears sporangia which produce spores by meiosis.
- These spores germinate to form free-living prothallus which represents a gametophyte.
- Sexual reproduction: Syngamy results in the formation of a diploid zygote. Zygote germinates into a diploid sporophyte.
Prothallus:
- It represents the gametophytic phase.
- Multicellular, independent, green, photosynthetic thallus.
- It needs damp and shady places.
- Bears sex organs, rhizoids and food-laden parenchymatous cells.
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