Tag: classification of microbes

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Multiple choice botany the living world archaebacteria the three domains of life classification of microbes

Choose the correct answers from the alternatives given.
Which of the following domains contains the most primitive bacteria that live in extreme environments?

  1. Archaea

  2. Plantae

  3. Fungi

  4. Eukarya
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Archaebacteria differ from other bacteria in having a different cell wall structure and this feature is responsible for their survival in extreme conditions.

Hence, the correct answer is 'Archaea'.

Multiple choice botany the living world archaebacteria the three domains of life classification of microbes

Methanogens belong to

  1. Slime moulds

  2. Eubacteria

  3. Archaebacteria

  4. Dinoflagellates.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Methanogens belong to archaebacteria. They are strict anaerobes. They are autotrophs which obtain both energy and carbon from decomposition products. They occur in marshy areas where they convert formic acid and carbon dioxide into methane with the help of hydrogen. This capability is commercially exploited in the production of methane and fuel gas inside gobar gas plants, e.g., Methanobacterium, Methanococcus. Some of the methanogens live as symbionts inside rumen of herbivorous animals that chew their cud. These archaebacteria are helpful to the ruminants in fermentation of celullose.

Multiple choice botany the living world archaebacteria the three domains of life classification of microbes

Choose the correct answers from the alternatives given.
Parasitic, flagellated protozoans of tropical regions known as trypanosomes are associated with which one of the following diseases?

  1. Amoebic dysentery

  2. Down syndrome

  3. Syphilis

  4. African sleeping sickness and chagas disease
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Trypanosoma parasites cause sleeping sickness or African trypanosomiasis or Chagas disease which is found in sub-Saharan Africa.

So, the correct option is 'African sleeping sickness and Chagas disease'.

Multiple choice botany the living world archaebacteria the three domains of life classification of microbes

State whether the following statements are true or false.
Azotobacter is a heterotrophic nitrogen fixing bacterium.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Nitrogen fixing is seen in heterotrophic bacteria live in the soil and fix significant levels of nitrogen, species like Clostridium, Bacillus, Azotobacter are called nitrogen-fixing bacteria.

So, the correct option is 'True'.

Multiple choice botany the living world archaebacteria the three domains of life classification of microbes

Bacteria which are found in marshy areas and among the flora of cattle rumen are called

  1. Acidophiles

  2. Thermophiles

  3. Methanogens

  4. Thermoacidophiles
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Methanogens are microorganisms that produce methane as a metabolic byproduct in hypoxic conditions. They are prokaryotic and belong to the domain of archaea. They are common in wetlands, where they are responsible for marsh gas, and in the digestive tracts of animals such as ruminants and humans, where they are responsible for the methane content of belching in ruminants and flatulence in humans. In marine sediments the biological production of methane, also termed methanogenesis, is generally confined to where sulfates are depleted, below the top layers. Moreover, the methanogenic archaea populations play an indispensable role in anaerobic wastewater treatments. Others are extremophiles, found in environments such as hot springs and submarine hydrothermal vents as well as in the "solid" rock of the Earth's crust, kilometers below the surface.

So the correct option is 'methanogens'.

Multiple choice botany the living world archaebacteria the three domains of life classification of microbes

Choose the correct answers from the alternatives given.
Facultative anaerobes:

  1. require a constant supply of oxygen

  2. are killed in an oxygenated environment

  3. do not always need oxygen

  4. are photosynthetic but do not give off oxygen
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A facultative anaerobe is an organism that makes ATP by aerobic respiration if oxygen is present, but is capable of switching to respiration if oxygen is absent.

So, the correct option is 'do not always need oxygen'.

Multiple choice botany the living world archaebacteria the three domains of life classification of microbes

State whether the following statements are true or false.
Methanogens are among the most recently evolved monerans.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Monera is the unicellular organism's having a prokaryotic cellular structure, these are microorganisms that evolve methane gas are prokaryotic and belong to the domain of archaea, methanogenic archaea are found in the digestive tracts of human beings along with ruminants, termites, and humans.

So, the correct option is 'false'.