Tag: cell : the basis of life

Questions Related to cell : the basis of life

Cell hypothesis was proposed by T. Schwann, the cell theory was proposed by 

biology cell biology cell as structural and functional unit introduction to cell biology cell : the basis of life

  1. M.J. Schleiden

  2. T. Schwann

  3. M. J. Schleiden and T. Schwann

  4. C.P. Swanson

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Correct Option: C
Explanation:

Theodor Schwann and Matthias Jakob Schleiden proposed the cell theory which describes the properties of cells. These cells are the basic unit of structure in all organisms and also the basic unit of reproduction.

The statement "All the tissues are made up of individual cells" was given by

biology cell biology cell as structural and functional unit introduction to cell biology cell : the basis of life

  1. Schleiden

  2. Schwann

  3. Virchow

  4. Wallace

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Correct Option: A
Explanation:

Matthias Jakob Schleiden, a German botanist who gave the cell theory, proposes that all plant tissues are composed of cells and that cells are the basic building blocks of all plants and generalized as all the tissue is made up of individual cells.

Who applied cell theory to plants?

biology cell biology cell as structural and functional unit introduction to cell biology cell : the basis of life

  1. Schwann

  2. Schleiden

  3. Jensen

  4. Swanson

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Correct Option: B
Explanation:

Cell theory was applied to plants by Schleiden. Theodor Schwann and Matthias Jakob Schleiden, proposed the cell theory which describes the properties of cells. These cells are the basic unit of structure in all organisms and also the basic unit of reproduction. The work on the plants was done by Matthias Jakob Schleiden.

The statement - All the tissues are made up of individual cells, is given by

biology cell biology cell as structural and functional unit introduction to cell biology cell : the basis of life

  1. Schleiden

  2. Schwann

  3. Virchow

  4. Wallace

Show answer
Correct Option: A
Explanation:

Two German biologists M.J.Schleiden (1838) and Theodore Schwann (1839) proposed the cell theory. According to the theory, all living organisms are composed of cells, which are the smallest entities that can be called as living.

Cells are the functional unit of an organism. Schleiden stated that all the tissues are made up of individual cells.
A German biologist Rudolph Virchow observed that all living cells arise from pre-existing cells (omniscellula e cellula) which was added to the cell theory as a doctrine. Alfred Russel Wallace, a British naturalist, conceived the theory of evolution through natural selection while working on Amazon River basin and then in the Malay Archipelago.
Thus, the correct answer is option A.

Cell theory states that

biology cell biology cell as structural and functional unit introduction to cell biology cell : the basis of life

  1. Cells have nucleus.

  2. Cells are the functional and structural units of plants and animals.

  3. All cells are non-living.

  4. Cells reproduce by mitosis and meiosis.

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Correct Option: B
Explanation:

Cell theory was proposed by a German botanist, Matthias Schleiden and English zoologist, Theodor Schwann in the year 1839. It states that cells are structural and functional unit of plants and animals. The cell theory includes the following points -
1) All living things are made up of cells.
2) The cell is the smallest living thing that can perform all the functions of life.   
3) All cells must come from pre-existing cells.

Who among the following applied the cell theory to plants?

biology cell biology cell as structural and functional unit introduction to cell biology cell : the basis of life

  1. Schwann

  2. Schleiden

  3. Jenseu

  4. Swanson

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Correct Option: B
Explanation:

The cell theory was developed from three German scientist's discoveries. They are Matthias Schleiden, Theodor Schwann, and Rudolph Virchow. In 1838, the German botanist Matthias Schleiden discovered that all plants were composed of cells.

Robert Hooke gave the phrase omnis cellula-e-cellula.

biology cell biology cell as structural and functional unit introduction to cell biology cell : the basis of life

  1. True

  2. False

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Correct Option: B
Explanation:

Cell theory was proposed by a German botanist, Matthias Schleiden and English zoologist, Theodor Schwann in the year 1839. Cell theory was considered as most acceptable theory which, elucidated the functioning of a cell. The cell theory includes the following points -
1) All living things are made up of cells.
2) The cell is the smallest living thing that can perform all the functions of life.   
Later on, in year 1855 Rudolf Virchow added a new point in cell theory that all cells must come from pre-existing cells, which was also known as "Omnis cellula e cellula".
So, the correct answer is option B.

In view of the current status of our knowledge about the cell structure, which of the following statement(s) about cell theory is/are correct?
(i) The cell theory does not hold good since all living organisms are not cellular in organisation.
(ii) The cell theory in its modified form means that all living objects are composed of cells capable of reproduction.
(iii) The cell theory means that all living objects consist of cells, whether reproducing or not.
(iv) The cell theory needed modification due to the discovery of sub-cellular structures such as chloroplasts and mitochondria.

biology cell biology cell as structural and functional unit introduction to cell biology cell : the basis of life

  1. (i) and (ii)

  2. (i), (ii) and (iii)

  3. Only (i)

  4. (ii) and (iii)

Show answer
Correct Option: C
Explanation:

The cell theory is one of the basic principles of biology. Credit for the formulation of this theory is given to German scientists Theodor Schwann, Matthias Schleiden and Rudolph Virchow.
The cell theory states-

1) All living organisms are composed of cells. They may be unicellular or multicellular.
2) Cells arise from pre-existing cells.
3) All living organism like virus are not formed by cells. 

Which of the following statements is related to the cell theory?

biology cell biology cell as structural and functional unit introduction to cell biology cell : the basis of life

  1. All organisms are made up of one or more cells.

  2. All organisms must be able to reproduce.

  3. Cells have organelles to carry on their functions.

  4. Cells evolved from a primordial soup on early Earth.

  5. Cells are able to regulate their external environment.

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Correct Option: A
Explanation:

Cell theory has 3 basic points: All living things are made of one or more cells. The cell is the smallest living thing that can perform all the functions of life. All cells must come from pre-existing cells through cellular division.

Choose the correct statement with respect to cell theory

biology cell biology cell as structural and functional unit introduction to cell biology cell : the basis of life

  1. All organisms are made up of one or more cells.

  2. All organisms must be able to reproduce.

  3. Cells have organelles to carry on their functions.

  4. Cells evolved from a primordial soup on early earth.

  5. Cells are able to regulate their external environment.

Show answer
Correct Option: A
Explanation:

  • The generally accepted parts of the cell theory include: All known living things are made up of one or more cells. 
  • All living cells arise from pre-existing cells by the division and cell is the basic unit of life.

Thus, the correct answer is option A.