What is Protista ?
What is Eubacteria ?
Answers
Answer:
Protista: Protists are simple eukaryotic organisms that are neither plants nor animals or fungi.
Eubacteria: Eubacteria are prokaryotic microorganism that consists of a single cell lacking a nucleus and containing DNA as a single circular chromosome.
Explanation:
protista: Protists are unicellular in nature but they can also be present as a cluster of cells. Most protists live in water, damp terrestrial environments or even as parasites and few are multicellular protists such as kelp which are almost exceeds over 100 feet in height.
Eubacteria: Eubacteria can be either gram-negative or gram-positive, they have high importance under the field of economic, agricultural, and medical. They include E. coli, Lactobacilli, and Azospirillum.
Answer:
A)Protista- Kingdom Protista includes Chrysophytes, Dinoflagellates, Eugleoids, slime mould and Protozoans.
1. It includes all unicellular and colonial eukaryotes.
2. Most of them are aquatic forming plankton.
3. Mode of nutrition may be photosynthetic, saprophytic, parasitic or holozoic.
4. Flagella if present are 11 stranded with 9+2 arrangement of microtubules composed of
tubulin.
5. Genetic material consists of 2 or more DNA molecules.
B)Eubacteria – They are called as true bacteria. They contain rigid cell wall, if motile contain flagellum.
Eubacteria are broadly classified into two types:
1) Autotrophs: the bacteria which can produce their own food.
a) photosynthetic: Cyanobacteria or blue-green algae are gram
positive photosynthetic bacteria. They
contain chlorophyll a and carotenoids. They
may be unicellular, colonial or filamentous,
fresh water, marine or terrestrial. Some of
them have specialized heterocyst cells to
perform nitrogen fixation.
b) Chemosynthetic:Chemosynthetic bacteria oxidize inorganic
substances like nitrate, nitrite, ammonia etc.
to produce energy and help in recycling of
nitrogen, phosphorous, sulphur.
2) Heterotrophs:Heterotrophic bacteria are most abundant and act as decomposer. They are helpful in production of curd, antibiotic and fixing nitrogen in leguminous plants.