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Alternation of generations
Concepts tested here
- Reduction of gametophyte
All Questions
2011 AIPMT-PRE 1 question
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Compared with the gametophytes of the bryophytes, the gametophytes of vascular plants tend to beIn bryophytes the gametophyte is the dominant, long-lived, green and independent phase of the life cycle, and it bears conspicuous multicellular antheridia and archegonia.
In vascular plants the sporophyte is the dominant phase and the gametophyte is progressively reduced.
In pteridophytes it is a small, short-lived prothallus; in gymnosperms and angiosperms it is reduced to a few cells (pollen grain and embryo sac) dependent on the sporophyte.
The sex organs are also reduced: archegonia are small in pteridophytes and gymnosperms and are absent in angiosperms, and antheridia are absent in seed plants.
Hence the gametophytes of vascular plants are smaller and have smaller sex organs.