Tag: micro - organisms: a wonderful world

Questions Related to micro - organisms: a wonderful world

The germ theory of diseases was established by

zoology micro - organisms: a wonderful world commercial use of microorganism microbes in household and industry microbial products - food, medicines and industrial products

  1. Louis Pasteur

  2. Robert Koch

  3. Lister

  4. Alexander Fleming

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Correct Option: A
Explanation:

Louis Pasteur proposed the germ theory of disease. This theory explains that the disease is caused by the microorganisms which cannot be seen by naked eyes. These are small and microscopic organisms. These organisms are dependent on the host for activities like growth. He demonstrated that fermentation is the result of the action of microorganism on sugar. 

Thus, the correct answer is 'Louis Pasteur'.

The fermenting agent of dosa and idli is

zoology micro - organisms: a wonderful world commercial use of microorganism microbes in household and industry microbial products - food, medicines and industrial products

  1. Saccharomyces cerevisiae

  2. Leuconostoc mesenteroides

  3. Streptococcus faecalis

  4. Both B and C

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Correct Option: D

Which one is not used in the production of Yoghurt?

zoology micro - organisms: a wonderful world commercial use of microorganism microbes in household and industry microbial products - food, medicines and industrial products

  1. Streptococcus lactis

  2. Streptococcus thermophilus

  3. Lactobacillus bulgaricus

  4. Acetobacter aceti

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Correct Option: D
Explanation:

Yoghurt are produced from cultures of Lactobacillus and Streptococcus.Acetobacter aceti has no role in production of yoghurt.

Correct answer-D

Which group is responsible for formation and flavour of yogurt?

zoology micro - organisms: a wonderful world commercial use of microorganism microbes in household and industry microbial products - food, medicines and industrial products

  1. Bacillus megathermus and Xanthomonas sp.

  2. Bacillus subtilis and E.coli

  3. Rhizobium meliloti and Azotobacter

  4. Lactobacillus casei and Streptococcus thermophilus

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Correct Option: D
Explanation:

Lactobacillus and Streptococcus that are capable of lactic acid fermentation are used in the flavouring of yogurt.

Correct answer-D

Large holes in Swiss cheese are formed due to production of a large amount of ${CO} _{2}$ by

zoology micro - organisms: a wonderful world commercial use of microorganism microbes in household and industry microbial products - food, medicines and industrial products

  1. Propionebacterium

  2. Mycobacterium

  3. Saccharomyces

  4. Penicillium

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Correct Option: A
Explanation:

Propionibacterium Sharmani or P.Sharmani is the bacterium used for the production of a large amount of CO2 for making large holes in cheese.

so, the correct option is 'Propionibacterium'.

The microorganism which is known as pond scum are

biology micro - organisms: a wonderful world diseases caused by protozoa protozoan disease protozoa: benefits and harmful effects

  1. Virus

  2. Algae

  3. Bacteria

  4. None of the above

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Correct Option: B
Explanation:

Pond scum is a massive growth of algae on the surface of the pond or any stagnant water source. 

So, the correct option is 'Algae'.

How does Paramecium look under compound microscope?

biology micro - organisms: a wonderful world diseases caused by protozoa protozoan disease protozoa: benefits and harmful effects

  1. Oval

  2. Irregular

  3. Circular

  4. Long thread like

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Correct Option: A
Explanation:

The Paramecium is a unicellular ciliated protozoan. It looks an oval, slipper-shaped micro-organism when observed under a microscope, rounded at the front/top and pointed at the back/bottom. It can also be seen by naked eyes.

A Paramoecium reproduces by 

biology micro - organisms: a wonderful world diseases caused by protozoa protozoan disease protozoa: benefits and harmful effects

  1. Budding

  2. Laying eggs

  3. Preparing spores

  4. Cell division

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Correct Option: D
Explanation:

In Paramoecium, reproduction takes place by binary fission method. At first, micronucleus divides into 2 nuclei by mitosis. The cytopharynx also divides into 2 parts. The cytoplasm is also divided into 2 parts. Then transverse constriction is made from two sides. New contractile vacuoles are formed. The constriction meet at centre and two daughter paramecia reproduced. Thus, the correct answer is option D.

Lates occurs in

biology micro - organisms: a wonderful world diseases caused by protozoa protozoan disease protozoa: benefits and harmful effects

  1. Sea

  2. Estuary

  3. Fresh water ponds

  4. Muddy waters

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Correct Option: B

The microorganism known as pond scum is autotrophic due to the presence of 

biology micro - organisms: a wonderful world diseases caused by protozoa protozoan disease protozoa: benefits and harmful effects

  1. Carotene

  2. Chlorophyll

  3. Melanin

  4. None of the above

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Correct Option: B
Explanation:

Pond scum is a massive growth of algae on the surface of the pond or any stagnant water source. They are autotrophic in nature due to the green compound present which helps in photosynthesis, these pigments are called chlorophyll.

So, the correct option is 'Chlorophyll'.