Table of Contents
Which thallus structure is Spirogyra?
unbranched multicellular filamentous structure
Structure of Spirogyra Thallus is a unbranched multicellular filamentous structure formed by arrangement of cylindrical cells head to head in a single row.
What is the cellular organization of Spirogyra?
Each cell of the filaments features a large central vacuole, within which the nucleus is suspended by fine strands of cytoplasm. The chloroplasts form a spiral around the vacuole and have specialized bodies known as pyrenoids that store starch.
What is thallus Organisation in algae?
Unicellular form of thallus organisation in algae This type of algal plant body consists of a single cell. The organisms are rounded, pear-shaped, oblong-shaped, or spherical in structure. Some unicellular algae are motile, while others are non-motile.
Is Spirogyra a chlorophyta?
Green algae, Spirogyra (Chlorophyta), are found in a wide range of habitats including small stagnant water bodies, rivers, and streams.
What level of organization is Spirogyra?
Unicellular organisms like the Amoeba, Spirogyra etc fall in the cellular level of organization.
What is the arrangement of chloroplasts of Spirogyra?
Spirogyra is a genus of filamentous green algae of the order Zygnematales, named for the helical or spiral arrangement of the chloroplasts that is diagnostic of the genus.
Which level of organization is Spirogyra?
What type of thallus organisation is found in Botrydium?
Siphonaceous: This type of thallus organisation is made up of long, hollow tube-like structure called coenocyte. Such coenocytic filament have many nuclei and is branched. Example: Vaucheria, Botrydium, etc.
What are the features of Chlorophyta?
i) They are green due to the presence of chlorophyll II. ii) Their cell wall is of two layers of which outer layer is made of pectosc and the inner layer is made of cellulose. iii) Their nucleus is well organized.
How is the Organisation of cells in Volvox different from that of the Spirogyra?
The spirogyra is a cell acting as a FILAMENT while in the Volvox, it’s a cell as a COLONY.
How many chloroplast does Spirogyra have?
Table 1
| Details | Trait 1 | Trait 2 |
|---|---|---|
| Number of chloroplasts | 2–3 | 2 |
| Shape of zoospore | Ellipsoid | ns |
| Zoospore width | 60–73 | ns |
| Zoospore length | 75–95 | ns |
Is chlorophyll present in Spirogyra?
Spirogyra is classified under Chlorophyta due to the presence of chlorophyll. The genus contains around 400 species.
Which type of thallus organization is present in Xanthophyceae?
siphonal organization
The most common and best known xanthophytes have siphonal organization, characterized by globose (Botrydium) or tubular (Vaucheria) thalli, where numerous nuclei and chloroplasts are dispersed in the protoplast and not separated by cell walls.
What is thallus structure?
A thallus is composed of filaments or plates of cells and ranges in size from a unicellular structure to a complex treelike form. It has a simple structure that lacks specialized tissues typical of higher plants, such as a stem, leaves, and conducting tissue.
What kind of thallus is found in Volvox?
coenobium
The Volvox forms colonies, so their cells are highly organized. The plant body is also termed as coenobium because it is largest and highly differentiated, and as a result would form the thallus. Therefore, it could be concluded that the thallus of Volvox is called coenobium.
What is the vegetative structure of Spirogyra?
The vegetative structure of Spirogyra is an unbranched filamentous thallus The thallus is multicellular with each cylindrical cell joined end to end They are 10-100 µm in width and may grow several centimetres in length They are present as a slimy mass due to the presence of mucilage sheath around the filament
What is the range of thallus structure of Chlorophyceae?
The range of thallus structure of Chlorophyceae is as follows: (i) Unicellular motile forms—e.g., Chlamydomonas. (ii) Unicellular non-motile forms—e.g., Chlorella. (iii) Colonial motile form—e.g., Volvox, Eudorina, Pandorina.
Why is Spirogyra classified under Chlorophyta?
When there is enough sunlight and warmth they produce large amounts of oxygen, which get stored as bubbles between the tangled filaments. Spirogyra is classified under Chlorophyta due to the presence of chlorophyll. The genus contains around 400 species. The vegetative structure of Spirogyra shows as unbranched filamentous thallus.
What is the organization of thallus?
Thus, a clear advancement in the organization of the thallus is seen in the sequence gradually from unicellular motile types to aggregates in a colony with a regular pattern, where the cells are inter-connected and behave as a single unit (multicellular organism).