Tag: cell and its discovery

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

The name 'cell' was coined by 

  1. Leeuwenhoek

  2. Robert Brown

  3. Robert Hook

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

Robert Hook, an English scientist, discovered a honey-comb like structure in a cork slice using a primitive compound microscope. Since a piece of cork slice is dead tissue so he could only see hollow compartment as the protoplasm was not present in these dead compartments. These compartments were called as 'cell' by him.

So, the correct answer is 'Robert hook'.

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

Observe the table and answer a, b.


S. No. Scientist Invention
1 Robert Hooke a
2 b Nucleus
3 Schleiden, Schwann  Cell theory

  1. a- Cell b- Robert Brown

  2. a- Cell wall b- Robert Brown

  3. a- Cell wall b- Schleiden

  4. a- Cell membrane b- Robert Brown
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • Robert Hooke had discovered plant cells more precisely, he saw the cell walls in cork tissue. In fact, it was Hooke who coined the term "cell" and also discovered cell wall.
  • Robert Brown had discovered the plant cell nucleus.
Multiple choice botany cell and cellular organization cell theory microscope cell and its discovery

In 1665, Robert Hooke first observed cells in 

  1. Leaf

  2. Cork

  3. Intestin

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

The first cell was observed and named by Robert Hooke in 1665. He described that it looked like cellula, small rooms which are inhabited by monks hence derived the name 'cell'. The cell he actually saw was the dead cell walls of the plant (cork) under a microscope. Hooke described the characteristics of a cell he observed in his book 'Micrographia'. 

So, the correct answer is 'Cork'

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

Unstained living cells can be best studied by

  1. Phase contrast microscope

  2. Electron microscope

  3. Fluorescent microscope

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

Phase contrast microscopy is a type of microscopic technique which converts phase shifts in light passing through a transparent specimen to brightness changes in the image. This technique made possible to study living cells without staining.

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

Robert Hook's observations were published in __________________.

  1. Zerographia

  2. Micrographia

  3. Bioraphia

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Living beings or organisms are made up of one or more cells. Cell is a basic unit of structure and function of organisms. It was discovered by Robert Hooke in 1665 when he saw empty box-like compartments in a very thin slice of cork under his microscope. He wrote the book "Micrographia" and coined the term cellula which was later changed into the cell. Robert Hooke thought-cells to be passages for conducting fluids.
So, the correct answer is 'Micrographia'.
Multiple choice botany cell and cellular organization cell theory microscope cell and its discovery

The distribution of two or more specific molecules within a cell can be studied by using

  1. Dark field microscope

  2. Fluorescent microscope

  3. Phase contrast microscope

  4. Interference contrast microscope
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The fluorescence microscope can localize and quantify specific molecules in the cells. It is the most versatile and powerful technique for localizing proteins within a cell by light microscopy, is fluorescent staining of cells and the observation in the fluorescence microscope.

Thus, the correct answer is option B.

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

The cell, as a basic unit of structure of living things, was discovered by 

  1. Aristotle

  2. Robert Hooke

  3. Schleiden and Schwann

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

Robert Hooke discovered cell in the year 1665. He observed cork cell in the bark of Spanish oak tree under a simple microscope and was able to see the empty structures surrounded by walls and named it a cell. He elucidated his observation in a book called "Micrographia".

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

Which one of the following can be visualized under fluorescent microscope?

  1. Chloroplast

  2. Actin filaments

  3. Nucleus

  4. Both A and B
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Fluorescent microscope is a modification of ultraviolet microscope, which was made by Coons in 1945. The instrument uses long wave ultraviolet rays for illumination. It has complementary filters, which allow the viewer to observe directly with the eyes. The microscope is useful in detecting those components which show autofluorescence, e.g., chlorophylls, collagen fibrils, actin filaments, vitamin A, etc. Others can be made fluorescent by coating with fluorochrome dyes like acridine orange and coriphosphine and minerals, eg., proteins, lipids, starch, glycogen, cellulose, etc. The light emitted by them is red, orange, yellow, or green against dark field. It is called as secondary fluorescence. The technique is also useful in diagnosis of viruses, bacteria and protozoans. Immunofluorescent antibody labelling techniques is used in diagnosis of specific molecules like antigens and antibodies. it involves conjugating specific fluorochromes with specific antibodies.

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

Very high wavelength rays are used in one of the following microscope.

  1. Fluorescent

  2. Polarising

  3. Ultraviolet

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

Fluorescent microscope is a modification of ultraviolet microscope which was made by Coons in 1945. The instrument uses long wave ultraviolet rays for illumination. It has complementary filters which allow the viewer to observe directly with the eyes. The microscope is useful in detecting those components which show autofluorescence, e.g., chlorophylls, collagen fibrils, vitamin A, etc. Others can be made fluorescent by coating with fluorochrome dyes like acridine orange and coriphosphine and minerals, eg., proteins, lipids, starch, glycogen, cellulose etc. The light emitted by them is red, orange, yellow, or green against dark field, it is called as secondary fluorescence. The technique is also useful in diagnosis of viruses, bacteria and protozoans. Immunofluorescent antibody labelling techniques is used in diagnosis of specific molecules like antigens and antibodies, it involves conjugating specific fluorochromes with specific antibodies.

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

Fluorescent microscope is used

  1. To localize cell structure as chlorophyll stained with fluorochromes.

  2. To study living cells.

  3. To study smallest organelle.

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

Fluorescent microscope is a modification of ultraviolet microscope which was made by Coons in 1945. The instrument uses long wave ultraviolet rays for illumination. It has complementary filters which allow the viewer to observe directly with the eyes. The microscope is useful in detecting those components which show autofluorescence eg. Chlorophylls, collagen fibrils, vitamin A etc.

So, the correct answer is 'To localize cell structure as chlorophyll stained with fluorochromes'.