Biology Help!!! Part I There are 3 general life cycles observed in Eukaryotes -

Question

Biology Help!!!

Part I

There are 3 general life cycles observed in Eukaryotes - What life cycle is observed in all species of Kingdom Plantae? What is the Sporophyte generation? What is the Gametophyte generation?

Part II
What are the 3 types of seedless, non-vascular plants? What are their common and scientific names? What traits are synapomorphic within this taxon?

Part III

What are the 4 types of seedless, vascular plants? What are their common and scientific names? What traits are synapomorphic within this taxon?

Explanation / Answer

Part I :

The three general life cycles observed in Eukaryotes are Diplontic, Haplontic and Haplo-diplontic.

Diplontic : Mitosis occurs in all diploid cells but the gametes are haploid which is produced through meiosis. Later, the gametes fuse to form zygote which undergo mitosis to result in diploid organism. Example for this type is animals.

Haplontic : Mitosis occurs only in haploid cells and also produce haploid gametes. Only the zygote is the diploid cell in the entire life cycle and it later undergoes meiosis to produce haploid organisms. Example for this type is most fungi and some green algae.

Haplo-diplontic (or diplohaplontic or diplobiontic or dibiontic ) : Mitosis occurs both in haploid and diploid cells. This type of organisms undergo alternation of generation where in one type of phase it is multicellular and haploid and in other type it is multicellular and diploid. Example for this type is plants and many types of algae. Sporophyte generation is multicellular and diploid while gametophyte generation is multicellular and haploid.

Part II :

Three types are Mosses, Hornworts and Liverworts.

Common name : Scientific name

1 . Mosses : Bryophyta

2. Liverworts : Marchantiophyta

3. Hornworts : Anthocerotopsida

Non-vascular seedless plants lack vascular tissues like xylem and phloem and stem, roots or any defined plant structure.

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