Question

four types of life cycle in various groups of algae. give notes written by hand or any expert coaching notes.

Answer 1

haplontic,diplomatic,diplohaplontic& triphase life cycles

Answer 2

Diplontic: 
In diplonts mitotic divisions only occur in diploid cells. Gametes (arisen through meiosis) are the only occurance of the haploid phase. The diploid zygote formed after fertilization can however divide mitotically. This process results in the production of a multicellular diploid organism or in the production of many diploid single cells. 
Animals, for example, belong to the diplonts. 
 

Haplontic: 
In haplonts the mitoses only occur in haploid cells. This can result in the formation of single haploid cells or a multicellular haploid organism. The haplontic life forms produce the gametes through mitosis. After fertilization a zygote is formed: this cell is the only diploid cell in the entire life cycle. It is thus that same zygotic cell that later undergoes meiosis. 
A haploid life cycle is found in most fungi and in some green algae like Chlamydomonas. 
 

Haplo-diplontic: 
In haplo-diplonts the mitoses occur in both diploid and haploid cells. Such organims go during their life cycle through a phase in which they are multicellular and haploid (the gametophyte), and a phase in which they are multicellular and diploid (the sporophyte). The phenomenon is called "alternation of generation". 
This haplo-diplontic type of cycle is found in all land plants and in many algae.

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