What are the phases of cell division?
These phases are prophase, prometaphase, metaphase, anaphase, and telophase.
Does mitosis occur in spirogyra?
The cytoskeleton of interphase cells of Spirogyra spp., as well as that of cells entering the division cycle (mitosis and cytokinesis), is quite well known ( Fowke and Pickett-Heaps 1969a , b; Hogetsu 1987; Goto and Ueda 1988; Grolig 1990, 1992, 1998; Iwata 1995; Iwata and Itoh 1998; Schröder and Grolig 1998; Iwata et …
What is the division of spirogyra?
Charophyta
| Spirogyra | |
|---|---|
| Kingdom: | Plantae |
| Division: | Charophyta |
| Class: | Zygnematophyceae |
| Order: | Zygnematales |
What are the 3 major stages phases of cell division?
The cell cycle is composed of interphase (G₁, S, and G₂ phases), followed by the mitotic phase (mitosis and cytokinesis), and G₀ phase.
What is the habitat of Spirogyra?
Spirogyra is a large genus (about 400 species) of freshwater green algae found in shallow ponds, ditches and amongst vegetation at the edges of large lakes, generally growing free-floating. It often grows in short-lived (‘ephemeral’) ponds that build up during wet weather, and dry up subsquently.
What is the economic importance of Spirogyra?
Some species of Spirogyra are used as a source of food in different parts of the world as they are rich in vitamins and minerals. Green algae like Spirogyra are also an important part of the aquatic ecosystems as they are photosynthetic and thus provide oxygen to other organisms in the water.
What is the class and phylum of spirogyra?
Spirogyra is classified under Chlorophyta due to the presence of chlorophyll. The genus contains around 400 species.
What is the division of amoeba?
In most single-celled organisms such as amoeba, cell division occurs through binary fission, a process that is similar to mitosis.
What is the S phase?
The S phase of a cell cycle occurs during interphase, before mitosis or meiosis, and is responsible for the synthesis or replication of DNA. In this way, the genetic material of a cell is doubled before it enters mitosis or meiosis, allowing there to be enough DNA to be split into daughter cells.
Which is the dominant stage of the Spirogyra life cycle?
Spirogyra undergo vegetative, asexual and sexual reproduction. The life cycle of Spirogyra is haplontic, i.e. the dominant stage is free-living haploid (n) gametophyte and the sporophyte is represented only by the diploid zygote (2n) Vegetative reproduction is by fragmentation.
What causes the fragmentation of a Spirogyra cell?
Fragmentation is also found to occur due to a mechanical injury or a change in their aquatic medium’s salinity and temperature. During unfavorable growth conditions, the cytoplasmic content of the cell shrinks and looses water, developing a hard covering around the cell, resulting in the formation of spores.
How are chloroplasts arranged in a Spirogyra cell?
In each cell, there is a nucleus, cytoplasm, a large central vacuole and spiral chloroplasts. Chloroplasts are ribbon-shaped and arranged spirally. There may be 1-16 chloroplasts present in a cell. Chloroplast contains many pyrenoids in a row. Pyrenoids store starch and protein. Spirogyra undergo vegetative, asexual and sexual reproduction.
How are the aplano gametes formed in Spirogyra?
Aplano Gametes are created in the gametangia, which are in turn formed at the end of the growing season of Spirogyra. The zygote in Spirogyra is known as zygospores. Zygospores are known as diploid (2n) and are formed by the fusion of male and female gametes. In the life cycle of Spirogyra, Zygospores are the only diploid stage.