Tag: cell and cellular organization

Questions Related to cell and cellular organization

The scientist who stated that plants and animal's body is consisted of cells was

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

  1. Leeuwenhoek

  2. Brown

  3. Schwann

  4. None of these

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Correct Option: C
Explanation:

In the beginning of the 19th century, Theodor Schwann (1839) established cell theory and postulated that cell is the basic unit of life. 

_______ discovered cells.

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

  1. Robert Hooke

  2. Robert Brown

  3. Leeuwenhoek

  4. Zacharias Jansen

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Correct Option: A
Explanation:

The cell was first discovered by Robert Hooke in 1665. He gave 60 'observations' in detail of various objects under a coarse, compound microscope. One observation was from very thin slices of bottle cork. Hooke discovered a multitude of tiny pores that he named "cells". He described a honeycomb like network of cellulae (latin for storage rooms) in cork slices.

The resolving power of a compound microscope will increase with

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

  1. Decrease in wave length of light and increase in numerical aperture.

  2. Increase in wave length of light and decrease in numerical aperture.

  3. Increase in both wave length of light and numerical aperture.

  4. Decrease in both wave length of light and numerical aperture.

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Correct Option: A
Explanation:

Resolving power is the ability to distinguish two close objects as distinct. It is calculated by the formula 0.61 wavelength/ numerical aperture, where  numerical aperture is the light collecting ability of lens. It is clear that resolving power will be more if wavelength is less and numerical aperture is more. Thus, the correct answer is option A.

If the  magnification of ocular lens is 10x and objective lenses with the magnification of 10x, 20x, 30x, and 43x of microscope . Which of the following can not be achieved with this microscope?

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

  1. 10x

  2. 100x

  3. 200x

  4. 300x

  5. 430x

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Correct Option: A

The magnification power of Leeuwenhoek's microscope was

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

  1. 100 times

  2. 200 times

  3. 300 times

  4. 10 times

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Correct Option: C

Which of the following organism can be observed in the smear of pond water?

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

  1. Fungi

  2. Bacteria

  3. Protozoa

  4. Virus

  5. Both B and C

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Correct Option: E

Antony Leeuwenhoek is known for

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

  1. Improvement of microscope

  2. Improvement of telescope

  3. Discovery of cell

  4. Both A and C

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Correct Option: A
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.

Hence, A is the correct option. 

Bacterial slides can be seen under

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

  1. 25X

  2. 45X

  3. 10X

  4. 100X

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Correct Option: D

Which of the following microscope used an electron beam to magnify the image of the object?

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

  1. Simple microscope

  2. SEM

  3. TEM

  4. Both B and C

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Correct Option: D

Study of structure, physiology, biochemistry, development, evolution, genetics of a cell is called

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

  1. Cytology.

  2. Histology.

  3. Cell Biology.

  4. Molecular Biology.

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Correct Option: C
Explanation:
  • Cell biology is the branch of biology that studies the structure and function of the cell, which is the basic unit of the life. 
  • Cell biology is also concerned with the physiological properties, metabolic processes, signalling pathways, life cycle, chemical composition and interaction of the cell with their environment. Hence, the study of structure, physiology, biochemistry, development, evolution, genetics of a cell is called cell biology.
  • So, the correct answer is 'cell biology'.