A. Bacteria which can complete their life cycle without oxygen

B. Bacteria which require oxygen for survival

C. Bacteria which can survive only in extreme heat

D. Bacteria which live exclusively in water

How severe can coronavirus infections be in humans?

A. Only mild, like a common cold

D. Only moderate, never life-threatening

Everyday Science · Cell Biology & Microorganisms · page 12 of 22

Bacteria MCQs with Answers

Includes 22 past paper MCQs (marked).

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Bacteria, Viruses & Microorganisms MCQs (111–120)

10 MCQs with answers and a short one-liner. Hide answers to test yourself.

Past paper MCQs in this chapter · See all past papers

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111.
Which of the following is not a component of the extracellular matrix in bacteria?
Correct Answer: C. Cell membrane
One-liner
The cell membrane is not a component of the extracellular matrix in bacteria; it is an intracellular structure that encloses the cytoplasm.
112.
Past Paper MCQ
What type of microorganism causes cholera?
Correct Answer: D. Bacteria
One-liner
Cholera is caused by the bacterium Vibrio cholerae.
113.
Past Paper MCQ
Which bacteria is responsible for causing pneumonia?
Correct Answer: B. Bacillus
One-liner
The bacterium responsible for causing pneumonia is Bacillus (specifically, *Streptococcus pneumoniae* and *Bacillus* species such as *Bacillus anthracis* can cause pneumonia).
114.
Anaerobic are?
Correct Answer: A. Bacteria which can complete their life cycle without oxygen
One-liner
Anaerobic are bacteria which can complete their life cycle without oxygen.
115.
How severe can coronavirus infections be in humans?
Correct Answer: B. Mild to lethal
One-liner
Coronavirus infections in humans can range from mild to lethal, depending on the strain and the individual's health condition.
116.
Which of the following is the major constituent of the planktic life?
Correct Answer: A. Diatoms
One-liner
The major constituent of planktic (planktonic) life is Diatoms, which are microscopic, unicellular algae with silica-based cell walls.
117.
According to scientific estimates, the life in the cosmos came into being as early as ?
Correct Answer: D. 3.5 billion years ago
One-liner
According to scientific estimates, life in the cosmos came into being as early as 3.5 billion years ago.
118.
The pre-erythrocytic cycle in Plasmodium occurs in _?
Correct Answer: D. Liver
One-liner
The pre-erythrocytic cycle in Plasmodium occurs in the liver.
119.
In which year did Robert Whittaker classify all organisms into five kingdoms?
Correct Answer: D. 1969
One-liner
Robert Whittaker proposed the five-kingdom classification system in 1969.
120.
What is another name for the Protista kingdom?
Correct Answer: A. Protoctista
One-liner
The Protista kingdom is also known as Protoctista.

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Bacteria MCQs with Answers

Bacteria, Viruses & Microorganisms MCQs (111–120)

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