How does Nostoc reproduce?
How does Nostoc reproduce?
Nostoc reproduce vegetatively or asexually by spore formation. The vegetative reproduction is by fragmentation. Small colonies can grow attached to a large colony and later form separated colonies. Hormogonia are short and free filaments.
What is the structure of Nostoc?
Cells of Nostoc spp. are spherical, barrel-shaped, or oval forming unbranched filaments. The filaments (trichomes) may contain both heterocysts (thick walled, specialized N-fixing cells) and akinetes (thick walled cell which functions as a resting cell). Nostoc spp.
What are features of Nostoc?
Like most blue-green algae, Nostoc contains two pigments, blue phycocyanin and red phycoerythrin, as well as chlorophyll, and has the ability to fix nitrogen in specialized cells called heterocysts. A terrestrial species has been used as a supplementary food source in Asia.
What is the life cycle of Nostoc?
The first one is the asexual method of reproduction. Herein, it forms spores called akinetes and new colonies are created as a result. Thus, it ends the initial life cycle of nostoc, which is then taken over by the newly formed nostocs….
| Domain | Bacteria |
|---|---|
| Order | Nostocales |
| Genus | Nostoc |
How many type of vegetative reproduction are done in Nostoc?
Reproduction in Nostoc 5 different types.
What is heterocyst in Nostoc?
Heterocysts or heterocytes are specialized nitrogen-fixing cells formed during nitrogen starvation by some filamentous cyanobacteria, such as Nostoc punctiforme, Cylindrospermum stagnale, and Anabaena sphaerica.
What is Heterocyst in Nostoc?
What is the function of Nostoc?
Hence, their main function is nitrogen fixation. Nostoc is a cyanobacterium. It can fix atmospheric nitrogen. It converts nitrogen into ammonia. The heterocysts present in it are specialized for nitrogen fixation.
What is the role of heterocysts in Nostoc?
Heterocysts are specialised cells, which contain the nitrogenase enzyme. They are the site for nitrogen fixation.
Why is Nostoc called blue-green algae?
Nostoc is an extremely fascinating genus of Cyanobacteria which are often called blue-green algae, though they are not all a blue-green color and, in fact, are not even algae at all. The green coloration comes from their chlorophyll while the blue comes from a photosynthetic accessory pigment called phycocyanin.
Which of these is the correct function of heterocyst in Nostoc?
nitrogen fixation
Nitrogenase is inactivated by oxygen, so the heterocyst must create a micro anaerobic environment. Hence, their main function is nitrogen fixation. Thus, the correct answer is option B.
Which cell division occurs in Nostoc?
Answer. The ans is : C) Amitotic. Hope it helps you.
What is heterocyst state its function?
A heterocyst is a differentiated cyanobacterial cell that carries out nitrogen fixation. The heterocysts function as the sites for nitrogen fixation under aerobic conditions. They are formed in response to a lack of fixed nitrogen (NH4 or NO3).
What are heterocysts in Nostoc?
Why is Nostoc called blue green algae?
What is heterocyst and its function?
What is the structure of a plasmid?
Structure of Plasmid: Plasmids are small, circular, double stranded, non-chromosomal DNA molecules. In most plasmids the two ends of the double stranded DNA molecule, that make up plasmids covalently bond together forming a physical circle.
What are the characteristics of the cells of nostocs?
The cells of nostocs are thick-walled. These thick walls are due to the presence of peptidoglycan. These cells also contain pigments of different kinds. For instance, they have chlorophyll, the green pigment that helps in performing photosynthesis. They also possess a blue pigment called phycocyanin and a red pigment called phycoerythrin.
What is the life cycle of nostocs?
The first one is the asexual method of reproduction. Herein, it forms spores called akinetes and new colonies are created as a result. Thus, it ends the initial life cycle of nostoc, which is then taken over by the newly formed nostocs. The process is called fragmentation, where small colonies get attached to larger ones.
Do Plasmids replicate independently of the host chromosome?
Reproduction in Plasmid: Plasmids replicate independently of the host chromosome, but some plasmids called episome (def) are able to insert or integrate the host cell chromosome, then their replication is integrated by the chromosome. Related Articles:
