Tag: botany

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Questions Related to botany

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

Plasmids are found in

  1. Bacteria

  2. viruses

  3. Algae

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

A plasmid is a small, circular piece of DNA that is different than the chromosomal DNA, which is all the genetic material found in an organism's chromosomes. It replicates independently of chromosomal DNA. Plasmids are mainly found in bacteria.

So, the correct option is 'Bacteria'.

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

What is true for Archaebacteria?

  1. All are halophiles

  2. All are photosynthetic

  3. All are fossils

  4. Oldest living organisms
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The archaebacteria are the primitive, single-celled, prokaryotic organisms. These are the ancient and oldest living organisms. These were the first organism which evolved on the Earth. These organisms have evolved to survive in the extreme conditions like the halophiles, thermophiles, acidophiles, methanogens, etc. 

Thus, the correct answer is option D. 

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

Archaebacteria which are seen at extremely high temperature and acidic pH are

  1. Methanogens

  2. Thermoacidophiles

  3. Halophiles

  4. Ruminant symbionts
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
A thermoacidophile are the organisms which are adapted to survive at high temperatures and acidic pH. Thermoacidophiles generally prefer the temperature range of about 70 - 80 $^o$ C and pH between 2 and 3. They are found in the hot springs and thermal vents. 
Thus, the correct answer is option B. 
Multiple choice botany the living world archaebacteria the three domains of life classification of microbes

A few organisms are known to grow and multiply at temperatures of 100 ` $105^{0}$C. They belong to


  1. Thermophilic sub aerial fungi

  2. Marine archaebaderia

  3. Thermophilic sulphur bacteria

  4. Hot spring blue-green algae
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Thermophilic sulphur bacteria are found in hot springs and multiply at temperatutures 100-105$^0$C

So, the correct answer is 'Thermophilic sulphur bacteria

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

Which of the following represents obligate anaerobes.

  1. Spirogyra

  2. Pisum sativum

  3. Onion

  4. Methane bacteria
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The term Obligate anaerobes represent such microorganisms which can survive only in the absence of oxygen, i.e. presence of oxygen in their surrounding environment acts as a poison for them. Methane bacteria also called as methanogens are methane-producing bacteria which are obligate anaerobes as their metabolic processes do not require oxygen. Spirogyra are the green algae which produces oxygen. Pisum Sativum is commonly known as Green pea, which is a vegetable. Onion is also a vegetable.

 

The correct answer is D. 

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

Biogas is produced by

  1. Eubacteria

  2. Archaebacteria

  3. Mycoplasma

  4. Cyanobacteria
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Methanogens are responsible for methane gas production in biogas. Methanogen belongs to Archaebacteria class. Archeae are prokaryotic bacteria. They have no cell nucleus. They were initially classified as bacteria and hence called as Archaebacteria. 

Thus, the correct answer is 'Archaebacteria.'

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

Prokaryotes which can trap solar energy for ATP synthesis, but not for photosynthesis are

  1. Methanogens

  2. Thermoacidophiles

  3. Halophiles

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

  • Halophiles are the prokaryotes that can be aerobic or anaerobic. 
  • The phototropic anaerobic halophiles can trap solar energy for the synthesis of ATP i.e Adenosine Triphosphate with the help of ATP synthase enzyme. ATP is also known as the energy currency of a cell.
  • The correct answer is C.

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

For production of methane, methanogens

  1. Oxidise carbon dioxide

  2. Reduce carbon dioxide

  3. Reduce alcohol

  4. Oxidise alcohol
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Methanogens are microorganisms that produce methane in absence of oxygen by the process called as methanogenesis. They belong to the kingdom Monera and the domain archaea. They use inorganic material as the source of energy such as hydrogen sulfide, elemental sulfur, ferrous iron, ammonia. They reduce carbon dioxide to methane and use hydrogen gas as an electron-donating reductant.

Thus, the correct answer is 'Reduce carbon dioxide.'

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

Food poisoning and gas forming rod-shaped bacterium is

  1. Shigella

  2. Salmonella

  3. Clostridium

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

Clostridium bacteria is one of the most cause of food poisoning. It is a rod-shaped Gram-positive bacteria. It is a causative agent of botulism disease. It is a gas forming bacteria. It causes causative agent of botulism Gas gangrene by producing gas in tissues in gangrene.

Thus, the correct answer is 'Clostridium.'

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

An obligate anaerobe is

  1. Ulothrix

  2. Spirogyra

  3. Methane bacteria

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

Obligate anaerobes are organisms which grow in absence of oxygen. In presence of oxygen, they cannot survive. The example includes methane producing bacteria or methanogens.  They obtain their energy without consumption of oxygen. Other examples include Clostridium species.

Thus, the correct answer is 'Methane bacteria.'