Tag: the living world

Questions Related to the living world

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?

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

  1. Amoebic dysentery

  2. Down syndrome

  3. Syphilis

  4. African sleeping sickness and chagas disease

Show answer
Correct Option: D
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'.

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

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

  1. True

  2. False

Show answer
Correct Option: A
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'.

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

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

  1. Acidophiles

  2. Thermophiles

  3. Methanogens

  4. Thermoacidophiles

Show answer
Correct Option: C
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'.

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

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

  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

Show answer
Correct Option: C
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'.

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

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

  1. True

  2. False

Show answer
Correct Option: B
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'.