As compared to gametophyte the sporophyte is complex and much elaborate whereas the gametophyte is simple and small as found in Laminaria of Phaeophyceae. This type of life cycle is called a haplodiplontic life cycle. Oogonia and antheridia produce egg and sperm respectively, which fuse to form a diploid zygote. Example: Clapdohora, Ulva, Draparnaldiopsis of Chlorophyceae, and Ectocarpus of Phaeophyceae follow this life cycle. It reproduces sexually when the conditions become unfavorable for growth. A sporophyte (/sp??ro? ← Prev Question Next Question →. This is known as alternation of generations. (a) Isomorphic or Homologous Diplohap­lontic Type, (b) Heteromorphic or Heterologous Diplo­haplontic Type. The haploid phase is represented by single-cell gametes or few celled gametophytes. The main plant body is thallus, which is diploid. Broadly speaking plant life cycles are of five types i.e. This zygote forms a sporo­phytic plant body. Haplo-diplontic: These gametes represent the gametophytic stage. The zygote divides mitotically to give rise to a new plant. The diplohaplontic life cycle has equally prominent haploid and diploid phases which are represented by two distinct vegetative individuals. After that, the zygote undergoes germination processes and form a sporophytic (diploid) plant. Their chromosome number and function are different. The diplontic life cycle is found in the Sargassum in which there is no alternation of generation.The diploid sporophytic phase represents the dominant vegetative plant body.It develops antheridia and oogonia on specific conceptacles. In the diplontic life cycle, the diploid stage or sporophyte is the dominant and independent stage of the plant and performs photosynthesis. monobiontic, dibiontic, haplontic, diplontic. There is two-stage in haplontic life cycle such as gametophyte (haploid) and sporophyte (diploid) which is represented only by zygote. The resulting diploid cells are called sporophytes and the … The zygote can then either undergo mitosis and enter its diploid phase, or perform meiosis and become haploid cells. Diplontic life cycle Ø This type is just a reversal of the haplontic type of life cycle Ø Life cycle is diphasic, but the prominent phase is diploid sporophytic phase Ø Haploid gametophytic phase in the life cycle is represented only by gametes diplontic - a life cycle in which the dominant phase is diploid . A haploid life cycle is found in most fungi and in some green algae like Chlamydomonas. Books. 677 Views. 4) haplodiplontic, haplontic In the sexual reproduction only oogamy is observed. The spores and gametes are transported by the water in a passive manner. In the whole cycle, zygotes are the only diploid cell; mitosis occurs only in the haploid phase. Economic Importance of Fungi In Medicine, Industry, Agriculture, and Food. Haplontic life cycle — the haploid stage is multicellular and the diploid stage is a single cell, meiosis is "zygotic". a. Algae like Spirogyra and volvox. There are four types of life cycle in algae such as Triphasic Life Cycle, Diplohaplontic Life Cycle, Diplontic Life Cycle, and Haplontic Life Cycle. © 2020 Microbiologynote.com Designed ❤️ by Sourav. Then the carposporophyte form carposporangium which is then develop a haploid carpospores. The cycles differ in … This way, the organism ends its diploid phase and produces several haploid cells. This procedure differs from one organism to the other. It can be observed in primi­tive members of Rhodophyceae like Batrachos­permum and Nemalion. The gametophytic (haploid) phase in Haplobiontic Type is elaborate, dominant and persists for a long time as compared to the sporophytic (diploid) phase which is represented only by zygote. Maths. Types of life cycles Haplontic 1 Alternations of generations 3 Diplontic 2. Eg All bryophytes and pteridophytes some brown algae (Laminaria). This includes the life cycles of many protozoa, all fungi, and some algae types. b. Fucus. 3) haplodiplontic, diplontic. Meiosis occurs during the change ove… It is thus that same zygotic cell that later undergoes meiosis. Next, a diploid tetrasporangia is developed from the tetrasporo- phytic plant and each diploid tetrasporangia produces four tetraspores (n) by meiotic division. After that, the gametes are fertilized and form a zygote. There are four types of life cycle in algae such as; The Diplohaplontic Life Cycle is two type such as; In this type, there is a succession of three distinct generations. Explore notes on Plant Kingdom and other important concepts related to NEET, only at BYJU’S. Haplontic Life Cycle, Diplontic Life Cycle, Diplohaplontic Life Cycle, Triphasic Life Cycle. All pteridophytes exhibit this pattern (Figure 3.7 c). 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