What is Siphonaceous thallus give two examples?
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 is Siphonaceous?
Definition of siphonaceous 1 : resembling a siphon especially in forming a continuous protoplasmic column or tube lower fungi with siphonaceous mycelia. 2 : having a siphon or group of siphons siphonaceous mollusks.
Do all algae have thallus?
The plant body in algae is always a thallus. It is not differentiated in root, stem and leaves. Algae range in size from minute unicellular plants (less than 1 µ in diameter in some planktons) to very large highly differentiated multicellular forms e.g., some sea-weeds.
What is the function of thallus in algae?
The thallus of filamentous fungi typically consists of microscopic filaments which branch out in all directions, thus colonizing the substrate that serves as food. They can grow over or into the substrate.
What is Heterotrichous form in chlorophyceae?
‘Hetero’ means different and ‘trichous’ denotes trichome or filament. In some algae, the plant body is very much evolved and consists of more than one type of filaments and thus, represents the heterotrichous habit. It is one of the characteristic feature of Chaetophorales of Chlorophyceae.
Why is the thallus of Vaucheria called Siphonaceous?
Why is the Thallus of Vaucheria Called Siphonaceous? The filaments do not have a septate, the protoplasm of vaucheria contains many nuclei which are continuous along with the entire length of the thallus. Thus the coenocytic Vaucheria thallus makes a siphonaceous structure.
What are the forms of algae?
Different forms of algae:
- Green algae (Chlorophyta)
- Euglenophyta (Euglenoids)
- Golden-brown algae and Diatoms (Chrysophyta)
- Fire algae (Pyrrophyta)
- Red algae (Rhodophyta)
- Yellow-green algae (Xanthophyta)
- Brown algae (Paeophyta)
How thallus is formed?
Flattened or foliaceous: The thalli develop as the primary filament cells divide in all directions and the essential filamentous structure is lost, eg, Porphyra, Ulva, and Enteromorpha (Fig. 3.1). Complex: Flat foliose or tubular thalli are formed by the division of cells in two or more planes.
What is Heterotrichous?
Definition of heterotrichous : having the thallus differentiated into a prostrate portion and an upright or projecting system many algae are heterotrichous.
What is Synzoospore in Vaucheria?
In Vaucheria, the multiflagellate compound zoospores also known as synzoospores or coenozoospores are developed in these genus usually in aquatic forms. A single compound zoospore develops in a single zoosporangium. Any distal branch of the thallus may convert into a zoosporangium.
What type of thallus Vaucheria have?
The thallus of Vaucheria is branched, non-septate and multinucleate structure which appears like single large cell but Vaucheria cannot be considered as single cell. As in multicellular forms mitotic divisions take place increasing the number of nuclei. The apical growth takes place.
What is Heterotrichous form in Chlorophyceae?
Which algae has Parenchymatous thallus?
In the case of parenchymatous algae, cells of the primary filament divide in all directions and any essential filamentous structure is lost. This tissue organization is found in Ulva (Chlorophyta) and many of the brown algae.
What is thallus structure in algae?
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 is Holocarpic and Eucarpic fungi?
In case of holocarpic, the thallus gets converted into reproductive structure sporangium on maturation. The fungus in which the thallus is differentiated into vegetative structures and reproductive structures is called eucarpic. The entire thallus is converted into a reproductive cell.
What is Heterotrichous habit in algae?
In green algae, a heterotrichous habit is the most highly developed type of habit. Complete Answer: Heterotrichy means plants, namely prostrate branches and erect branches that produce two types of branches. The erect filament system arises in the plant body from the prostate filament system.
Which algae produces Synzoospore?
Note: The formation of synzoospore occurs only in the vaucheria. Vaucheria is a member of class Xanthophyceae (yellow-green) algae. The body of Vaucheria consists of an aseptate, tubular, irregularly branched, coenocytic filament.
What is the difference between brown algae and siphonaceous algae?
The siphonaceous algae have coenocytic body (multinucleate, without septa) which may be simple or complex and elaborate. The brown algae which are exclusively marine and always multicellular, often have large complex thalli.
What are the characteristics of siphonaceous alga?
The typical siphónaceous alga has a large central vacuole surrounded by a layer of protoplasm, containing nuclei and chloroplasts, which lines the cell wall. Pick a style below, and copy the text for your bibliography. MICHAEL ALLABY ” siphonaceous . ” A Dictionary of Plant Sciences. .
What are the flagellated unicellular forms of algae?
The flagellated unicellular forms are seen in various classes of algae. The flagellated unicelled structures are distinctive of certain classes e.g., Euglenineae, Cryptophyceae, Chrysophyceae and Dinophyceae. Flagellated vegetative cells are absent in Cyanophyceae, Phaeophyceae, Rhodophyceae, Bacillariophyceae.
What are the morphological characteristics of algae?
Morphological Characteristics of Algae: Algae exhibit a very wide range of morphological diversity. The simplest forms are unicellular, microscopic, motile or non-motile eukaryotic cells. They may be spherical (Protococcus, Chlorella), or pyriform (Chlamydomonas).