What is Trichoblast Polysiphonia?
What is Trichoblast Polysiphonia?
The short branches or trichoblasts are branches of limited growth. These are uniaxial in structure and lack pericentral siphons. The cells are connected to each other by pit connections. These branches arise on main axis and on long branches in spiral manner. Their cells contain very few chromatophores.
What is Polysiphonia cystocarp?
From Wikipedia, the free encyclopedia. A cystocarp is the fruiting structure produced in the red algae after fertilization, especially such a structure having a special protective envelope (as in Polysiphonia). The structure from which carpospores are released.
What is a Carposporangium?
Carposporangium – (plural: carposporangia) in red algae, the cell in a carposporophyte that produces carpospores. Carposporophyte – formed by the union of haploid gametes in red algae; diploid (2n) stage of the life cycle that is carried by the haploid female gametophyte in the cystocarp; produces carpospores.
What type of life cycle is Polysiphonia?
Polysiphonia : Life Cycle • The life cycle of Polysiphonia is triphasic and haplo- diplobiontic. Three different phases in the life cycle : i) Haploid phase represented by the male and female gametophytes ii ) Diploid phase represented by carposporophyte (Cystocarp) iii ) Diploid phase represented by tetrasporophyte.
Why Polysiphonia is called so?
The genus Polysiphonia derives its name from the polysiphonous nature of its thallus. The central siphon is surrounded by 4–24 pericentral siphons. Polysiphonia is commonly found as an epiphyte on plants and lithophyte on rocks in brackish estuaries in the intertidal and sublittoral regions.
What is Monospores?
Definition of monospore : a simple nonmotile asexual spore in some algae exhibiting alternation of generations that is produced by a plant of the diploid generation and germinates to form another diploid plant. — called also neutral spore.
What is Carposporophyte?
What is Carposporophyte? Carposporophyte is an individual form that develops from the diploid zygote. Therefore, carpospore is a diploid thallus. It is a unique red algal stage. It has different parts: gonimoblast filaments, carposporangia, carpospores and placental cells.
Does Polysiphonia have a Haplontic life cycle?
The correct option depicting their classes and life cycles is. Polysiphonia shows haplontic/haplo-diplontic life cycle.
How does Polysiphonia reproduce?
Polysiphonia reproduces both by sexual and asexual methods. Most species of Polysiphonia are heterothallic. The male sex organs, the spermatangia, are produced from superficial spermatangial mother cells in very dense clusters upon the branches of the fertile trichoblasts, situated near the growing apex of the male thallus.
How many species of Polysiphonia are there?
Reproduction 6. Life Cycle. The genus Polysiphonia (Gr. poly — many; siphon — tube) is represented by more than 150 species, out of which about 16 species are reported from India. They grow in marine habitat and are cosmopolitan in distribution. Commonly they are found in littoral and sublittoral zones.
Where do Polysiphonia grow in India?
The genus Polysiphonia (Gr. poly — many; siphon — tube) is represented by more than 150 species, out of which about 16 species are reported from India. They grow in marine habitat and are cosmopolitan in distribution. Commonly they are found in littoral and sublittoral zones. In India they are found in western and southern coasts.
What are the characteristics of polysiphonous plant?
1. Plant body is polysiphonous. 2. Apical growth takes place by single dome- shaped apical cell. 3. Sexual reproduction is of advanced oogamous type. 4. Post-fertilisation stage is much elaborate. 5. Cystocarp is well-developed. Polysiphonia reproduces both asexually and sexually. Sexual reproduction is of oogamous type.
