Which one of the following is a free living obligate anaerobic bacterium ?
A. Clostridium
B. Rhodospirillum
C. Azotobacter
D. Bacillus subtilis
Answer
345k+ views
Hint: Anaerobic bacteria are the bacteria which can survive without oxygen .
Step by step answer:Obligate anaerobes are microorganisms that are killed by the normal atmospheric concentration of oxygen. An anaerobic organism is an organism that does not require oxygen for growth. It may react negatively or even die in the presence of free oxygen.
Clostridium is a free-living, anaerobic obligate bacteria.
Rhodospirillum is an anaerobic and free-living, nitrogen-fixing bacteria.
Azotobacter is a free-living and non-symbiotic, heterotrophic bacteria capable of fixing nitrogen.
Bacillus subtilis and also known as the hay bacillus or grass bacillus is gram positive, catalyst positive bacteria found in the soil, and in the gastrointestinal tract of ruminants and animals.
So the correct answer is (A)
Additional information :
Clostridium is a genus of gram-positive bacteria. There are obligate anaerobes capable of producing endospores. Clostridium contains about 250 species that include common free-living as well as pathogenic bacteria. The normal reproducing cells of clostridium called a vegetative form, are in rod-shaped. Clostridium endospores have a distinct bottle shape. Clostridium species inhabited soils and intestinal tracts of animals including humans. Clostridium is a normal inhabitant of the healthy lower reproductive tract of females.
Note: The endospores of clostridium are as unique than other bacteria as others have ovoid-shaped endospores.
Step by step answer:Obligate anaerobes are microorganisms that are killed by the normal atmospheric concentration of oxygen. An anaerobic organism is an organism that does not require oxygen for growth. It may react negatively or even die in the presence of free oxygen.
Clostridium is a free-living, anaerobic obligate bacteria.
Rhodospirillum is an anaerobic and free-living, nitrogen-fixing bacteria.
Azotobacter is a free-living and non-symbiotic, heterotrophic bacteria capable of fixing nitrogen.
Bacillus subtilis and also known as the hay bacillus or grass bacillus is gram positive, catalyst positive bacteria found in the soil, and in the gastrointestinal tract of ruminants and animals.
So the correct answer is (A)
Additional information :
Clostridium is a genus of gram-positive bacteria. There are obligate anaerobes capable of producing endospores. Clostridium contains about 250 species that include common free-living as well as pathogenic bacteria. The normal reproducing cells of clostridium called a vegetative form, are in rod-shaped. Clostridium endospores have a distinct bottle shape. Clostridium species inhabited soils and intestinal tracts of animals including humans. Clostridium is a normal inhabitant of the healthy lower reproductive tract of females.
Note: The endospores of clostridium are as unique than other bacteria as others have ovoid-shaped endospores.
Recently Updated Pages
Basicity of sulphurous acid and sulphuric acid are

Which of the following would not be a valid reason class 11 biology CBSE

Why should electric field lines never cross each other class 12 physics CBSE

An electrostatic field line is a continuous curve That class 12 physics CBSE

What are the measures one has to take to prevent contracting class 12 biology CBSE

Suggest some methods to assist infertile couples to class 12 biology CBSE

Trending doubts
What is 1 divided by 0 class 8 maths CBSE

Fill the blanks with the suitable prepositions 1 The class 9 english CBSE

Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE

What is pollution? How many types of pollution? Define it

Change the following sentences into negative and interrogative class 10 english CBSE

Why do noble gases have positive electron gain enthalpy class 11 chemistry CBSE

How fast is 60 miles per hour in kilometres per ho class 10 maths CBSE

Write an application to the principal requesting five class 10 english CBSE

Give 10 examples for herbs , shrubs , climbers , creepers
