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: The spore mother cells undergo meiosis to produce haploid spores. Each spore produces a new gametophyte. Different members of plant kingdom have variation in their life cycle. In case of angiosperms and gymnosperms, the sporophyte plant body is a photosynthetic and dominant stage. In pteridophytes, the sporophytic phase is the dominant phase but is small and dependent on the gametophyte in the early stages. 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.