What is the life cycle of Vaucheria?
According to Williams, Hanatsche and Gross the life cycle of Vaucheria is haplontic, the oospore being the only diploid structure in life cycle (Figs. 8, 9). Vaucheria thallus is haploid. It is aseptate, branched, tubular and coenocytic structure.
What kind of life cycle does spirogyra have?
The life cycle of Spirogyra occurs via one of the three ways; vegetative, asexual, and sexual. The vegetative and sexual cycles are more common than asexual cycles. A form of alternation of generation characterizes the life cycle of Spirogyra.
What is the difference between spirogyra and algae?
As nouns the difference between algae and spirogyra is that algae is (alga) while spirogyra is any of a group of freshwater, filamentous green algae, of the genus , having chloroplasts arranged in spirals.
How does spirogyra live?
Spirogyra live in freshwater habitats from shallow ditches to the edges of mighty lakes, and they use their chloroplasts to change light energy into food (photosynthesis), just like your typical houseplants. You can also see that the individual Spirogyra cells link together to form long filament chains.
What flagella is found in Vaucheria?
Each nucleus along with some cytoplasm metamorphoses into single spindle shaped biflagellate antherozoid (Fig. 3.87E). The flagella are unequal in length, dissimilar (one whiplash and other tinsel) and laterally inserted.
Which type of nucleus is found in Vaucheria?
The chloroplasts are located on the periphery of the cytoplasm with the nuclei aggregating toward the center near the vacuole. It has a diplontic life cycle, previously thought to be haplontic….
|Genus:||Vaucheria A.P. de Candolle|
Is algae unicellular or multicellular?
Algae are morphologically simple, chlorophyll-containing organisms that range from microscopic and unicellular (single-celled) to very large and multicellular. The algal body is relatively undifferentiated and there are no true roots or leaves.
Is Ulothrix filamentous algae?
Ulothrix, genus of filamentous green algae (family Ulotrichaceae) found in marine and fresh waters. Each cell contains a distinct nucleus, a central vacuole, and a large thin chloroplast with at least one pyrenoid. The specialized cell for attachment is called the holdfast, and the filaments are typically unbranched.
Why spirogyra is so called?
Named for their beautiful spiral chloroplasts, spirogyras are filamentous algae that consist of thin unbranched chains of cylindrical cells. They can form masses that float near the surface of streams and ponds, buoyed by oxygen bubbles released during photosynthesis.
What is the mode of reproduction in Spirogyra?
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. Under the favourable conditions, vegetative reproduction is the preferred mode of reproduction.
What is Spirogyra?
Spirogyra is a filamentous type of freshwater green algae, which are most easily recognized due to their spirally coiled chloroplasts. Spirogyra spp. are filamentous, unbranched algae that have a unique mode of sexual reproduction. Around 400 species of Spirogyra are found throughout the world in various freshwater bodies.
What is Gongrosira stage of Vaucheria?
When many akinetes remain attached to the parent thallus, the thallus gives the appearance of another alga Gongrosira. Hence this stage of Vaucheria is called Gongrosira stage. During favourable conditions the akinetes and cysts develop into new thalli.
How does reproduction take place in Vaucheria?
Reproduction in Vaucheria takes place by vegetative, asexual and sexual methods. The vegetative reproduction takes place by fragmentation. The thallus can break into small fragments due to mechanical injury or insect bites etc.