Tag: cell theory

Questions Related to cell theory

Who had a great contribution in the field of microbiology?

botany cell and cellular organization cell theory microscope cell and its discovery

  1. Leeuwenhoek

  2. Pasteur

  3. Spallanzani

  4. All of the above

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Correct Option: D

Leeuwenhoek was the first who observed .......... under the microscope.

botany cell and cellular organization cell theory microscope cell and its discovery

  1. Fungi

  2. Virus

  3. Bacteria

  4. Plant cell wall

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Correct Option: C
Explanation:

Antony Von Leeuwenhoek was the first person to discover bacteria in 1670.It happened because he was trying to look at pond water with his magnifying lens and was able to see many large bacteria. He used a compound microscope.He described cells in a drop of pond water using a microscope made by him. He was the first person to observe bacteria and protozoa. By observing the movement of bacteria or protozoa he named them animalcules. Therefore, the correct answer is option C.

9X was the maximum magnification of .......... microscope.

botany cell and cellular organization cell theory microscope cell and its discovery

  1. First

  2. Second

  3. Advanced

  4. None of the above

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Correct Option: A
Explanation:

A- A microscope helps in magnifying small objects. Zacharias Jansen and his father Hans created the first microscope in 1595. This microscope was made up of a long brass tube with two lenses. 9X was the maximum magnification of this microscope. Magnification helps in viewing an object by making it larger.

Single lens microscope was built by

botany cell and cellular organization cell theory microscope cell and its discovery

  1. Robert Hook

  2. Robert Koch

  3. Leeuwenhoek

  4. Janssen

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Correct Option: C
Explanation:

Antonie van Leeuwenhoek used single-lens microscopes, which he made, to make the first observations of bacteria and protozoa. His extensive research on the growth of small animals such as fleas, mussels, and eels helped disprove the theory of spontaneous generation of life.

Microscope used by Robert Hooke had a magnification of 

botany cell and cellular organization cell theory microscope cell and its discovery

  1. $10-20$x

  2. $14-42$x

  3. $8-16$x

  4. $16-64$x

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Correct Option: B

The term cytology was coined by

botany cell and cellular organization cell theory microscope cell and its discovery

  1. Hertwig.

  2. Robert Hooke.

  3. Dutrochet.

  4. Corti.

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Correct Option: A
Explanation:

Oscar Hertwig is a German zoologist and a professor who coined the term cytology. The cytology means the branch of biology which deals with the study of structure and functioning of plant and animal cell.

So, the correct answer is 'Hertwig'.

An optical instrument used to observe small organism is called as_____________.

botany cell and cellular organization cell theory microscope cell and its discovery

  1. Microscope

  2. Telescope

  3. Magnifying lens

  4. Both A and B

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Correct Option: A
Explanation:

A- Microscope is a device which is used to view objects that are very small for the naked eye. Light microscopes also known as optical microscopes are the most common type of microscopes. Optical microscopes utilize light and lenses to magnify images. 

The cell arises from pre-existing cell was stated by

botany cell and cellular organization cell theory microscope cell and its discovery

  1. Haeckel

  2. Virchow

  3. Hooke

  4. Schleiden

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Correct Option: B
Explanation:
Cell theory was postulated by Theodor Schwann and Matthias Schleiden in 1838. It includes the following points-
  • All living organisms are composed of one or more cells.
  • The cell is the most basic unit of life. The third was added by Rudolf Virchow in 1855, which stated: "Omnis cellula e cellula" which means all cells arise only from pre-existing cells.

The term microscope was coined by

botany cell and cellular organization cell theory microscope cell and its discovery

  1. Janssens

  2. Faber

  3. Hooke

  4. Leeuwenhoek

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Correct Option: B
Explanation:
The term microscope was coined by Faber. It was mainly used for the compound microscope. It was termed as little eye by Galileo. It has magnifying lens which helps to accentuate the size of the microscopic objects. It has two sets of lens objective and eye piece which helps in magnification. The number of times it magnifies is known as magnification power.
So, the correct answer is option B.

The scientist who saw the living cell for the first time was

botany cell and cellular organization cell theory microscope cell and its discovery

  1. Leeuwenhoek

  2. M. J. Schleiden

  3. Kolliker

  4. Pallade

Show answer
Correct Option: A
Explanation:
  • Antonie van Leeuwenhoek was the first to notice living cells under his microscope which he called animalcules through his preliminary microscope.
  • M.J. Schleiden co-founded cell theory.
  • Kolliker has made major contributions to viewing zoological and histological samples.
  • Pallade was awarded the noble for discovering the ribosomes and rough endoplasmic reticulum. Thus, the correct answer is option A.