Nostoc Structure: Classification, Diagram, Life cycle

Nostoc Structure: belongs to the genus Cyanobacteria in Monera. Blue-green algae. Nostoc common in blue and air bacteria. Widely distributed in alkaline soils, wet rocks, ponds, streams, and lakes. Several filaments included in the mass. Individual capillaries called trachomata. Linear Trichome-like bead structure.

Nostoc Structure

The body of the Nostoc called a thallus. It is a simple body consisting of many strands (called strands) of a similar structure. Each filament consists of many circular units, which arranged in a chain or as beads. All cells are the same. The entire wick covered with a colloidal sheath.

In capillaries, some cells are larger and have thick walls, called heterozygous cysts. These cells perform two functions, reproduction and nitrogen fixation. During nitrogen fixation, nitrogen converted into simple nitrogen compounds for plant use.

Trachoma is branchless and embroidered. Single cells are mostly spherical, but sometimes barrel or cylindrical. All cells in the trachoma are essentially the same in structure, but from time to time they will find larger, round, pale yellow cells with thick walls called hetero abscesses. Most trachoma’s tear near the ovarian cyst and form hormones, which helps split.


Each unit of Nostoc is round. Its covered with the outer cell wall. The origin of the cell consists of two parts:

Nostoc Structure


The outer colored part of the cell wall, which contains a green blue pigment (phycocyanin). Because of the chlorophyll tincture and used in food preparation. Color Quality (Nostoc Cell Structure)


It is a colorless part within the cell, which contains food particles stored. It also serves as a nuclear device. The cell does not contain a real nucleus. The central center does the nucleus function. It has no nuclear membrane or nucleus, so it’s called the primary nucleus. This is (incomplete core).

Reproduction Of Nostoc

 There is no sexual reproduction in Nostoc. In Nostoc, replication occurs in the following ways:

1. Through hormones or through fragmentation

The hormone consists of fragments. The strands broken in different locations, and each broken thread called a hormone. The thread breaks due to the dissolution and death of normal cells. Heterogeneous cysts may form breakpoints. Through repeated cell divisions, each oogonium grows in new strands.


2. By Arthrospores OR by Akinetes Formation

Under unfavorable conditions, some filamentous cells become larger and covered with thick walls, and called bare seeds, arthropods, or comfort spores. They also store food ingredients. Growing in new strands under favorable conditions.


3. By Heterocyst

During reproduction, heterozygous cyst separated from nostalgic strands. These heterocyclic cysts become normal bacterial cells. Through the process of cell division, Its converted into new strands.

Nostoc Nutrition

Nostoc contains chlorophyll, so it can make its own food, that is, self-feeding organisms in nature.

Importance of Cyanobacteria

  • Blue bacteria (blue bacteria and green algae) use carbon dioxide to release oxygen during photosynthesis, so the environment becomes fresh and used by aquatic animals.
  • They participated in nitrogen fixation.

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