What are vegetative cells in Nostoc?

Nostoc punctiforme is a phenotypically complex, filamentous, nitrogen-fixing cyanobacterium, whose vegetative cells can mature in four developmental directions. The particular developmental direction is determined by environmental signals. The vegetative cell cycle is maintained when nutrients are sufficient.

What is the function of vegetative cells in Anabaena?

Its vegetative cells photosynthesize and fix CO2. In the presence of oxygen (O2) and absence of a source of combined nitrogen, A. variabilis fixes atmospheric nitrogen (N2) in specialized cells called heterocysts that differentiate from vegetative cells.

What is the function of Nostoc and Anabaena?

Answer:Heterocysts are specialized nitrogen-fixing cells formed during nitrogen starvation by some filamentous cyanobacteria, such as Nostoc punctiforme, Cylindrospermum stagnale, and Anabaena sphaerica. Nitrogenase is inactivated by oxygen, so the heterocyst must create a microanaerobic environment.

What is Anabaena Nostoc?

Anabaena, genus of nitrogen-fixing blue-green algae with beadlike or barrel-like cells and interspersed enlarged spores (heterocysts), found as plankton in shallow water and on moist soil. There are both solitary and colonial forms, the latter resembling a closely related genus, Nostoc.

What’s the difference between Anabaena and Nostoc cells?

Nostoc forms a gelatinous colony, appearing cylindrical, spherical or ovoid while Anabaena forms filaments, which are coiled or straight. The size of the colonies of Nostoc is around 20 cm while the cell size of Anabaena is 4-50 micrometer.

How big are the cells of Nostoc 9?

Genus: Nostoc  contains organisms that form spherical colonies of filaments embedded in a gelatinous substance Nostoc 9. Comprehensive Description  cylindrical, spherical or ovoid cells  Heterocysts are intercalary  Size of colonies range from microscopic to 20cm diameter  Some form a gelatinous colony

How big can an Anabaena or Nostoc colony get?

Comprehensive Description  cylindrical, spherical or ovoid cells  Heterocysts are intercalary  Size of colonies range from microscopic to 20cm diameter  Some form a gelatinous colony 10. Habitat: Depth: 0-0m Temperature range: adapted to extreme environments Reproduction:  by fragmentation Nostoc flagelliforme  Edible, delicacies in Asia

How is the filament of Anabaena different from a vegetative cell?

The filament of Anabaena consists of string of beaded cells. Several intercalary heterocysts are present in the trichome. Heterocysts are of same shape as of vegetative cell. The filaments are ordinarily straight. But they may be circinate or irregular. Filaments occur singly within a sheath. Sheaths are always hyaline and watery gelatinous.