Tag: botany

Questions Related to botany

Which statement is true about domain archaea?

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

  1. They differ from both prokaryotes and eukaryotes

  2. They completely differ from prokaryotes

  3. They resemble eukarya in all aspects

  4. They have some novel features absent in other prokaryotes and eukaryotes

Show answer
Correct Option: D
Explanation:

Domains Archaea contains single-celled microorganisms. These are prokaryotes. They do not have a true nucleus or membrane-bound organelles. They lack peptidoglycan in the cell wall. However, they have some novel features absent in other prokaryotes and eukaryotes. Instead of ester bonds like in prokaryotes and eukaryotes, they have ether bonds connecting fatty acids to molecules of glycerol. 

Thus, the correct answer is 'They have some novel features absent in other prokaryotes and eukaryotes.'

Thermococcus, Methanococcus and Methanobacterium exemplify

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

  1. Bacteria whose DNA is relaxed or positively supercoiled but which has a cytoskeleton as well as mitochondria

  2. Bacteria that contain a cytoskeleton and ribosome

  3. Archaebacteria that contain proteins homologous to eukaryotic core histones

  4. Archaebacteria that lack any histones resembling those found in eukaryotes but whose DNA is negatively supercoiled

Show answer
Correct Option: C

Archaea differ from eubacteria in one of the following features

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

  1. They have a rigid wall

  2. Their cell wall lacks peptidoglycan component

  3. They have $16$ sRNA

  4. They are very ancient

Show answer
Correct Option: B

Organisms called methanogens are most abundant in

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

  1. Polluted stream

  2. Cattle yard

  3. Sulphur rock

  4. Hot spring

Show answer
Correct Option: B
Explanation:

Methanogen belongs to Archaebacteria group. They are capable of producing methane gas or marshy gas or biogas. They produces methane gas in marshy areas. They are most abundant in marshy areas and cattle yard where cow sheds are present. The methange gas produces a peculiar odour in these areas.

Thus, the correct answer is 'Cattle yard.'

Archaebacteria live in harsh habitat like

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

  1. Extreme salty area

  2. Hot springs

  3. Marshy areas

  4. All of the above

Show answer
Correct Option: D
Explanation:

Archaebacteria are prokaryotes without true nucleus. They are of mainly 3 types, halophiles, thermophiles and methanogesn. They live in harsh habitat. Halophiles archaebacteria are found in extreme salty areas. Thermophiles are found in hot springs where temperature is extremely high. Methanogens are found in marshy areas and produce methange gas.

Thus, the correct answer is 'All of the above.'

Some hyperthermophilic organisms that grow in highly acidic $(pH _2)$ habitats belong to two groups

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

  1. Cyanobacteria and diatoms

  2. Protists and mosses

  3. Liverworts and yeasts

  4. Eubacteria and archaea

Show answer
Correct Option: D
Explanation:
  • Many thermophiles are archaea, while thermophilic eubacteria are suggested to have been among the earliest bacteria.
  •  Many of these require elemental sulfur for growth. Some are anaerobes, that use the sulfur as an electron acceptor during cellular respiration. 
  • Some are lithotrophs, that oxidize sulfur to sulfuric acid, thus requiring the microorganism to be adapted to very low pH as well. These organisms are inhabitants of hot, sulfur-rich environments such as hot springs and geysers etc. Option D is correct.

A peculiar odour found in marshy areas and cow sheds is of gas produced by

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

  1. Archaebacteria

  2. Cyanobacteria

  3. Slime Moulds

  4. Mycoplasma

Show answer
Correct Option: A
Explanation:

Methanogen belongs to Archaebacteria group. They are capable of producing methane gas or marshy gas or biogas. They produces methane gas in marshy areas and cow sheds. This produces a peculiar odour.

Thus, the correct answer is 'Archaebacteria.'

The primitive prokaryotes responsible for the production of biogas from the drug of ruminant animals include

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

  1. Eubacteria

  2. Halophiles

  3. Thermoacidophiles

  4. Methanogens

Show answer
Correct Option: D
Explanation:

Methanogens belongs to Archaebacteria. They are primitive prokaryotes. They produce methane gas or biogas. They produce biogas or marshy gas from the drug of ruminant animals. They are found in marshy areas and digestive tract of ruminants.

Thus, the correct answer is 'Methanogens.'

Archaebacteria common in marshes and rice fields are

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

  1. Methanogens

  2. Halophiles

  3. Thermoacidophiles

  4. All of the above

Show answer
Correct Option: A
Explanation:

Methanogens belongs to Archaebacteria. The other members of Archaebacteria includes halophiles and thermophiles. These are primitive prokaryotes. Methanogens produce methane gas or biogas. They produce biogas or marshy gas in marshy areas, rice fields and digestive tract of ruminants.

Thus, the correct answer is 'Methanogens.'

Which one among the following is likely to be present in the harsh conditions of the deep sea water?

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

  1. Saprophytic fungi

  2. Archaebacteria

  3. Eubacteria

  4. Blue-green algae

Show answer
Correct Option: B
Explanation:
Archeabacteria are also known as extremophiles because of the ability to survive in extreme environmental conditions. The deep sea environment is characterized by increased pressure, low visibility, low in nutrition etc. 
So, the correct answer is Archaebacteria.