Micro Organisms Questions and Answers

Q: Deliberately injecting weak microbes into a healthy body and producing antibodies to fight against strong microbes is called _______

Correct answer: VaccinationVaccination introduces a weakened or killed organism, or a part of one, so that the body mounts a response and retains memory cells. A later encounter with the real pathogen is then met at once. Antibiotics treat an infection already present; a vaccine prevents one.

Q: Which one of the following is not a beneficial effect of fungi?

Correct answer: They are used to make yoghurt.Yoghurt is made with bacteria - Lactobacillus and Streptococcus - not with fungi. The other three are genuine benefits: fungi produce antibiotics such as penicillin, they act as decomposers, and they are essential to cheese making.

Q: Living organisms which are invisible to the naked eye are called _________ .

Correct answer: MicroorganismsOrganisms too small to be seen without a microscope are microorganisms - bacteria, protozoa, many algae and fungi, and viruses. The category is defined by size alone, so it contains organisms of quite unrelated kinds.

Q: The scientist who discovered fermentation is

Correct answer: Louis PasteurLouis Pasteur showed in the 1850s that fermentation is caused by living microorganisms, not by a purely chemical process as had been supposed. The same work led to pasteurisation and to the germ theory of disease.

Q: The shape of a coccus bacterium is generally

Correct answer: SphericalA coccus is spherical. The other basic shapes are the rod (bacillus), the comma (vibrio) and the helix (spirillum or spirochaete).

Q: Organisms that take in nutrients from dead and decaying matter are called

Correct answer: SaprotrophsSaprotrophs feed on dead and decaying matter, secreting enzymes onto it and absorbing the products - the fungi and many bacteria. They are the decomposers, without which nutrients would stay locked in dead material and the cycles of matter would stop.

Q: Which of these microorganisms contains chlorophyll?

Correct answer: AlgaeAlgae contain chlorophyll and photosynthesise. Fungi have none - they absorb organic nutrients - and viruses are not cells at all.

Q: Rhizobium, the organism found in the root nodules of legumes, is a -

Correct answer: BacteriaRhizobium is a soil bacterium. It invades the roots of legumes, forms nodules, and fixes atmospheric nitrogen into ammonia the plant can use, taking sugars in return.

Q: Which one of the following microorganisms is not a virus?

Correct answer: SalmonellaSalmonella is a bacterium, the cause of typhoid and of much food poisoning. Ebola, rhinovirus (the common cold) and influenza are all viruses.

Q: Which one of the microorganisms below reproduces inside living cells and eventually kills the cell?

Correct answer: VirusA virus takes over the host cell’s machinery to make copies of itself, and the cell is commonly destroyed as the new particles are released. That is what makes viruses so hard to treat: attacking the virus means attacking a process the cell itself is carrying out.

21.

Deliberately injecting weak microbes into a healthy body and producing antibodies to fight against strong microbes is called _______

A.Medication
B.Antibiotics
C.Vaccination
D.All of the above

Answer: C

Correct answer: Vaccination

Vaccination introduces a weakened or killed organism, or a part of one, so that the body mounts a response and retains memory cells. A later encounter with the real pathogen is then met at once. Antibiotics treat an infection already present; a vaccine prevents one.

Discuss in Forum

22.

Which one of the following is not a beneficial effect of fungi?

A.They are used in making antibiotics.
B.They can act as decomposers.
C.They are used to make yoghurt.
D.They are used in the manufacture of cheese.

Answer: C

Correct answer: They are used to make yoghurt.

Yoghurt is made with bacteria - Lactobacillus and Streptococcus - not with fungi. The other three are genuine benefits: fungi produce antibiotics such as penicillin, they act as decomposers, and they are essential to cheese making.

Discuss in Forum

23.

Living organisms which are invisible to the naked eye are called _________ .

A.Particles
B.Molecules
C.Microorganisms
D.Macroorganisms

Answer: C

Correct answer: Microorganisms

Organisms too small to be seen without a microscope are microorganisms - bacteria, protozoa, many algae and fungi, and viruses. The category is defined by size alone, so it contains organisms of quite unrelated kinds.

Discuss in Forum

24.

The scientist who discovered fermentation is

A.Alexander Fleming
B.Louis Pasteur
C.Gregor Mendel
D.Edward Jenner

Answer: B

Correct answer: Louis Pasteur

Louis Pasteur showed in the 1850s that fermentation is caused by living microorganisms, not by a purely chemical process as had been supposed. The same work led to pasteurisation and to the germ theory of disease.

Discuss in Forum

25.

The shape of a coccus bacterium is generally

A.Spherical
B.Rod like
C.Comma shaped
D.Spiral

Answer: A

Correct answer: Spherical

A coccus is spherical. The other basic shapes are the rod (bacillus), the comma (vibrio) and the helix (spirillum or spirochaete).

Discuss in Forum

26.

Organisms that take in nutrients from dead and decaying matter are called

A.Autotrophs
B.Heterotrophs
C.Saprotrophs
D.Autoheterotrophs

Answer: C

Correct answer: Saprotrophs

Saprotrophs feed on dead and decaying matter, secreting enzymes onto it and absorbing the products - the fungi and many bacteria. They are the decomposers, without which nutrients would stay locked in dead material and the cycles of matter would stop.

Discuss in Forum

27.

Which of these microorganisms contains chlorophyll?

A.Virus
B.Fungus
C.Algae
D.All

Answer: C

Correct answer: Algae

Algae contain chlorophyll and photosynthesise. Fungi have none - they absorb organic nutrients - and viruses are not cells at all.

Discuss in Forum

28.

Rhizobium, the organism found in the root nodules of legumes, is a -

A.Bacteria
B.Fungi
C.Lichen
D.Algae

Answer: A

Correct answer: Bacteria

Rhizobium is a soil bacterium. It invades the roots of legumes, forms nodules, and fixes atmospheric nitrogen into ammonia the plant can use, taking sugars in return.

Discuss in Forum

29.

Which one of the following microorganisms is not a virus?

A.Ebola
B.Rhinovirus
C.Salmonella
D.Influenza

Answer: C

Correct answer: Salmonella

Salmonella is a bacterium, the cause of typhoid and of much food poisoning. Ebola, rhinovirus (the common cold) and influenza are all viruses.

Discuss in Forum

30.

Which one of the microorganisms below reproduces inside living cells and eventually kills the cell?

A.Virus
B.Bacteria
C.Penicillin
D.Fungus

Answer: A

Correct answer: Virus

A virus takes over the host cell’s machinery to make copies of itself, and the cell is commonly destroyed as the new particles are released. That is what makes viruses so hard to treat: attacking the virus means attacking a process the cell itself is carrying out.

Discuss in Forum

Loading…

Topics

Subject Categories

Tags: Micro Organisms Questions and Answers || Micro Organisms MCQ Questions and Answers || Micro Organisms GK Questions and Answers || Micro Organisms GK MCQ Questions || Micro Organisms Multiple Choice Questions and Answers || Micro Organisms GK || GK on Micro Organisms || Microbiology Questions and Answers || Microbiology MCQ Questions and Answers || Microbiology GK Questions and Answers || GK on Microbiology

Micro Organisms Questions and Answers

Topics

Subject Categories

About Us

Stay informed about all important Dates & Notifications