Biology · Environmental Studies

Microbiology and Nitrogen Cycle

950 Questions

This hub focuses on microbiology and the nitrogen cycle, covering essential concepts about bacteria and soil microbes. Topics include nitrogen fixation, bacterial structures, and soil microbial processes. These concepts are frequently tested in general science sections of various competitive exams.

Nitrogen fixing bacteriaGram-positive bacteriaBacterial flagellaDenitrifying bacteriaAmmonia conversion processBacterial resting spores

Microbiology and Nitrogen Cycle Questions

Multiple choice botany families of angiosperms family fabaceae eudicots family - fabaceae, sativum and solanaceae study of some important families

Choose the correct answer from the alternatives given.
Plants like clover and beans, that have nitrogen-fixing bacteria in their roots, belong to the family:

  1. Fabaceae

  2. Brassicaceae

  3. Solanaceae

  4. Asteraceae
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
The Fabaceae or Leguminosae, commonly known as the legume, pea, or bean family, are a large and economically important family of flowering plants and clover and beans belong to fabacea.
So, the correct option is 'Fabaceae'
Multiple choice

The process by which bacteria convert atmospheric nitrogen into a form usable by plants is called:

  1. Nitrogen fixation

  2. Nitrification

  3. Denitrification

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

Nitrogen fixation is the process by which bacteria convert atmospheric nitrogen into a form usable by plants, such as nitrates and ammonium.

Multiple choice

The process by which bacteria convert nitrates into nitrogen gas, releasing it into the atmosphere, is known as:

  1. Nitrogen fixation

  2. Nitrification

  3. Denitrification

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

Denitrification is the process by which bacteria convert nitrates into nitrogen gas, releasing it into the atmosphere.

Multiple choice

The process by which bacteria convert ammonium into nitrates is called:

  1. Nitrogen fixation

  2. Nitrification

  3. Denitrification

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

Nitrification is the process by which bacteria convert ammonium into nitrates.

Multiple choice

Which type of extremophile is known for its ability to thrive in extremely hot environments?

  1. Psychrophile

  2. Thermophile

  3. Acidophile

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

Thermophiles are extremophiles that thrive in extremely hot environments, such as hydrothermal vents or hot springs. They have adapted to these conditions and can survive at temperatures that would be lethal to most other organisms.

Multiple choice

Which of the following is NOT a type of extremophile that can survive in extreme environments?

  1. Psychrophile

  2. Thermophile

  3. Acidophile

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

Psychrophile is not a type of extremophile that can survive in extreme environments. Psychrophiles are organisms that thrive in cold environments, such as polar regions or deep sea hydrothermal vents. They are not adapted to survive in extreme heat, acidity, or alkalinity.

Multiple choice

Which of the following is an example of a contact tracing method?

  1. Sentinel surveillance

  2. Active case finding

  3. Interviewing individuals who have been exposed to an infectious disease

  4. Using digital tools to track the movements of individuals
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Interviewing individuals who have been exposed to an infectious disease is an example of a contact tracing method used to identify and notify individuals who may have been exposed to the disease.

Multiple choice

What is the role of microorganisms in composting and anaerobic digestion?

  1. They break down organic matter

  2. They produce heat

  3. They generate biogas

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Microorganisms play a crucial role in both composting and anaerobic digestion. They break down organic matter, produce heat, and generate biogas. These processes are essential for the decomposition of organic waste and the production of valuable end products.

Multiple choice

Which of the following is NOT a type of bioremediation?

  1. Aerobic bioremediation

  2. Anaerobic bioremediation

  3. Phytoremediation

  4. Natural attenuation
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Natural attenuation is a process that removes contaminants from groundwater naturally, not a type of bioremediation.

Multiple choice

What is the role of the flagellum in a bacterial cell?

  1. Movement

  2. Adhesion

  3. Sensing

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

The flagellum is a whip-like structure that allows bacteria to move.

Multiple choice

Which of the following is NOT a type of virus?

  1. DNA virus

  2. RNA virus

  3. Prion

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

Prions are not viruses, but rather infectious proteins.

Multiple choice

Which type of microorganism is responsible for the decomposition of organic matter?

  1. Bacteria

  2. Viruses

  3. Fungi

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

Bacteria play a crucial role in the decomposition of organic matter, breaking it down into simpler compounds.

Multiple choice

Which type of microorganism is responsible for the nitrogen cycle?

  1. Bacteria

  2. Viruses

  3. Fungi

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

Bacteria play a crucial role in the nitrogen cycle, converting nitrogen gas into forms that can be used by plants.

Multiple choice

Which of the following is NOT a type of virus?

  1. DNA virus

  2. RNA virus

  3. Retrovirus

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

Prions are not viruses, but rather infectious proteins that can cause neurodegenerative diseases such as Creutzfeldt-Jakob disease and mad cow disease.