Eubacteria (True Bacteria): Features and Examples for NEET
Biology · Biological Classification · NEET
Eubacteria means "true bacteria." NCERT gives them two simple features: they have a rigid cell wall, and if they can move, they use a flagellum. Examples inside eubacteria include the photosynthetic cyanobacteria (blue-green algae), chemosynthetic bacteria, and heterotrophic bacteria. Memory hook: "TRUE bacteria = TRUE wall + flagellum for the mover."
A eubacterium: prokaryotic (no true nucleus), a rigid peptidoglycan cell wall, and a flagellum shown only because motile bacteria use it to move. These are the exact two features NCERT lists for eubacteria.
Your doubts, answered
Are eubacteria true bacteria or false bacteria?
Eubacteria are TRUE bacteria. The word 'eu' means true. NCERT says 'thousands of different eubacteria or true bacteria.' The phrase 'false bacteria' is a trap word that NEET 2016 used in a wrong-statement question, so remember eubacteria = true bacteria, never false.
What is the difference between eubacteria and archaebacteria?
Both are bacteria in Kingdom Monera, but archaebacteria live in extreme harsh places (salty, hot springs, marshy) and have a DIFFERENT cell wall structure that helps them survive there. Eubacteria are the ordinary 'true bacteria' with a normal rigid cell wall. So the key exam line is: archaebacteria = special cell wall + extreme habitat; eubacteria = rigid cell wall + everywhere.
Do all eubacteria have a flagellum?
No. NCERT says 'a rigid cell wall, AND IF MOTILE, a flagellum.' That means a flagellum is present only in bacteria that can move. Non-motile eubacteria have no flagellum. NEET tests this by pretending pili or fimbriae cause movement, but only the flagellum does.
Is cyanobacteria (blue-green algae) a eubacteria?
Yes. NCERT places cyanobacteria (blue-green algae) inside the eubacteria section. They have chlorophyll a like green plants and are photosynthetic autotrophs. They are prokaryotic, so they sit in Kingdom Monera, not with real plants. This makes 'Cyanobacteria are autotrophic organisms under Kingdom Monera' a CORRECT statement in NEET.
What type of cell wall do eubacteria have?
Eubacteria have a rigid, non-cellulosic cell wall made of peptidoglycan (polysaccharide + amino acids). It is NOT cellulose like plants and NOT chitin like fungi. Note: Mycoplasma completely lack a cell wall, so they are the exception you must remember.
What gives the bacterial cell its sticky character?
The glycocalyx (a slime layer or capsule) outside the cell wall gives bacteria their sticky character. The rigid cell wall gives shape and support, but stickiness comes from glycocalyx. NEET 2017 asked exactly this.
⚠️ The NEET trap ✗ Eubacteria are also called false bacteria. ✓ Eubacteria are called TRUE bacteria (eu = true). They have a rigid cell wall and, if motile, a flagellum. 🧠 See 'eu' = TRUE. NEET 2016 hid the wrong answer as 'false bacteria' - eubacteria are never false.
Real NEET questions
2016
Which one of the following statements is wrong?
A · Cyanobacteria are also called blue-green algae
B · Golden algae are also called desmids
C · Eubacteria are also called false bacteria ✓
D · Phycomycetes are also called algal fungi
Solution: Eubacteria are called 'true bacteria' (eu = true), not false bacteria, so option C is the wrong statement. The other three are correct per NCERT: cyanobacteria are blue-green algae, golden algae are desmids, and phycomycetes are algal fungi. This is the classic NEET word-trap on eubacteria.
2016
Select the wrong statement.
A · Bacterial cell wall is made up of peptidoglycan
B · Pili and fimbriae are mainly involved in motility of bacterial cells ✓
C · Cyanobacteria lack flagellated cells
D · Mycoplasma is a wall-less microorganism
Solution: Pili and fimbriae are NOT motility structures; bacterial motility is by the flagellum only. So option B is the wrong statement. The bacterial wall is peptidoglycan (A correct), cyanobacteria lack flagellated cells (C correct), and Mycoplasma has no cell wall (D correct). Remember: 'if motile, a flagellum.'
2019
Which of the following is a correct statement?
A · Cyanobacteria are a group of autotrophic organisms classified under Kingdom Monera. ✓
B · Bacteria are exclusively heterotrophic organisms
C · Slime moulds are saprophytic organisms classified under Kingdom Monera.
D · Mycoplasma have DNA, Ribosome and cell wall
Solution: Cyanobacteria are prokaryotic photosynthetic autotrophs placed in Kingdom Monera, so A is correct. B is wrong (bacteria may be autotrophic or heterotrophic). C is wrong (slime moulds are protists, not Monera). D is wrong (Mycoplasma lack a cell wall).
Solved Biological Classification NEET PYQs
Try the real previous-year questions from this chapter — each with the answer and a full solution.
'Eu' means true. So eubacteria literally means true bacteria. This is the opposite of the NEET trap word 'false bacteria.'
What are the two main features of eubacteria in NCERT?
One, a rigid cell wall. Two, a flagellum if the bacterium is motile (able to move). Only these two features are stated in the NCERT eubacteria line, so learn them word for word.
Give examples of eubacteria for NEET.
Cyanobacteria such as Nostoc and Anabaena (photosynthetic), chemosynthetic bacteria that oxidise nitrates/nitrites/ammonia, and heterotrophic bacteria that make curd, antibiotics and fix nitrogen in legumes.
Why is Mycoplasma special among bacteria?
Mycoplasma completely lacks a cell wall and is the smallest living cell. Because eubacteria are defined by a rigid cell wall, Mycoplasma is the exception NEET loves to test.
Are cyanobacteria plants or bacteria?
They are bacteria. Even though they photosynthesise like plants, they are prokaryotic, so they belong to Kingdom Monera as eubacteria, not to Kingdom Plantae.
