What are the characteristics of Polysiphonia?
Important Features of Polysiphonia:
- Plant body is polysiphonous.
- Apical growth takes place by single dome- shaped apical cell.
- Sexual reproduction is of advanced oogamous type.
- Post-fertilisation stage is much elaborate. ADVERTISEMENTS:
- Cystocarp is well-developed.
What type of life cycle is Polysiphonia?
In a nutshell, in the life cycle of Polysiphonia, three distinct phases, haploid gametophyte, diploid carposporophyte and diploid sporophyte are present. Hence, its life cycle is called as triphasic and haplo-diplobiontic.
Is Polysiphonia haploid or diploid?
The carpospores undergo repeated mitotic divisions during germination to ultimately form a diploid tetrasporophyte of Polysiphonia, which is a diploid filament and produces haploid tetraspores (Fig. 3.24E and F). Ultimately, the sporangial wall ruptures and the tetraspores are liberated.
What is Polysiphonia used for?
Valued as a food plant, Polysiphonia retain their red coloring and gelatinous form, even when heated. These red algae are often used as a vegetable substitute for gelatin in puddings, ice cream, and toothpaste. As its generic name implies, Polysiphonia forms many “pipes” or branches in its typical configuration.
What is the meaning of Polysiphonia?
: a large genus of red algae (family Rhodomelaceae) having usually a filamentous much-branched thallus variable in shape and size but in cross section showing a single axial cell surrounded by a sheath of tubular cells at least in the axis and main branches.
What is true about Polysiphonia?
Polysiphonia is a red alga, filamentous and usually well branched some plants reaching a length of about 30 cm. They are attached by rhizoids or haptera to a rocky surface or other alga. The thallus (tissue) consists of fine branched filaments each with a central axial filament supporting pericentral cells.
What is the life cycle of Ulothrix?
Hence, the Life cycle in Chlamydomonas, Ulothrix, Spirogyra is haplontic. Note: Starting with a diploid zygote or spore and finishing with a fully mature alga plant, all algae go through a haploid life cycle of growth. Algae are divided into three classes: Chlorophyceae, Phaeophyceae, and Rhodophyceae.
Is Polysiphonia Haplontic or Diplontic?
Answer: Haplo diplontic type of life cycle is exhibited by Ectocarpus, Polysiphonia and Kelps. Here, diploid saprophytic phase alternate with haploid gametophytic phase. In Fucus, the main plant body is saprophytic and it shows diplontic type of life cycle.
What is the body form of Polysiphonia?
As its generic name implies, Polysiphonia forms many “pipes” or branches in its typical configuration. Branch-like structures consist of a line of elongated cells that displays a segmented appearance, and produces secondary branches that radiate from the algae body.
What are Carpogonia give example?
: the egg-bearing portion of the female reproductive organ in some red algae.
Is Ulothrix branched?
Ulothrix is a genus of non-branching filamentous green algae, generally found in fresh and marine water. Its cells are normally as broad as they are long, and they thrive in the low temperatures of spring and winter.