Title: Alternation of Generation in Plants (Metagenesis) | Botany Today
Headings: Alternation of Generation in Plants (Metagenesis)
Alternation of Generation in Plants (Metagenesis)
Important Points in Alternation of Generation
Features of a Gametophyte
Features of a Sporophyte
Different Types of Life Cycle
Haplontic Life Cycle
Diplontic Life Cycle
Haplodiplontic Life Cycle

Content: In bryophytes, the gametophytic phase is a dominant phase and photosynthetic. Different Types of Life Cycle
There are three different types of life cycles found in kingdom Plantae. Haplontic Life Cycle
Here, the sporophytic phase is represented by a diploid zygote that undergoes meiosis to form haploid spores. The haploid spores then undergo mitosis to give rise to a new haploid gametophyte. In this cycle, the gametophytic phase is photosynthetic and dominant in nature. This life cycle is seen in some algae such as Volvox and Spirogyra. Diplontic Life Cycle
In this cycle, the gametophytic phase is a haploid gametophyte that can be single-celled or few-celled. Here the diploid sporophytic phase is photosynthetic, dominant and independent of the gametophyte. This kind of life cycle is found in an alga (Fucus), in all gymnosperms and angiosperms. Haplodiplontic Life Cycle
This is an intermediate between haplontic and diplontic life cycle.