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Cell Structure and Functions Test - 17

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Cell Structure and Functions Test - 17
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  • Question 1
    1 / -0
    The unit of measurement used for expressing dimension (size) of cells is
    Solution
    The majority of cells are small. Normal animal cell size varies from 10 to 30 micrometer, while plant cell stretches from 10 to 100 micron. 
  • Question 2
    1 / -0
    Cells are the .......... structural units of living organism.
    Solution
    • Cells are called the smallest structural and functional unit of life because all the living organisms are made up of cells and also all the functions taking place inside the body of organisms are performed by cells. 

    So, the correct answer is option B.
  • Question 3
    1 / -0
    The majority of the cells cannot be seen directly with our naked eyes because
    Solution
    The majority of the cells cannot be seen directly with our naked eyes because cells are extremely small. Microscopes are composed of the combination of lenses which forms a magnified image.
    So, the correct answer is option B.
  • Question 4
    1 / -0
    The eukaryotic cells differ from prokaryotic cells in having:
    Solution
    • Prokaryotic cells do not have membrane-bound organelles such as the nucleus, mitochondria, Golgi, and endoplasmic reticulum, etc. 
    • While in eukaryotic cells, membrane-bound organelles and non-membrane-bound organelles (ribosomes and centriole) both are present.
    • The cell wall is present in prokaryotic cells (bacteria) as well as in some eukaryotic cells, like fungal and plant cells.
    • Hence, the eukaryotic cells differ from prokaryotic cells in having a well-organised nucleus and mitochondria.

    So, the correct answer is option D.
  • Question 5
    1 / -0
    Which of the following is not a cell?
    Solution
    The virus is an acellular microscopic infection-causing agent. It has only a protein cover and a nucleic acid (either DNA or RNA). These are intracellular parasites that depend upon the host for nutrition.
    So, the correct answer is option D.
  • Question 6
    1 / -0
    What is the structural and functional unit of living organisms?
    Solution
    Cells are called the structural and functional unit of life because all the living organisms are made up of cells and also all the functions taking place inside the body of organisms are performed by cells. Cells provide specific conditions, for the occurrence of the metabolic reactions. These have specialized enzymes, which catalyze the biochemical reaction and regulates the functions of the body.
  • Question 7
    1 / -0
    The control centre of cell is:
    Solution
    The nucleus is an important cell organelle. It contains the genetic material and also controls all the activities of a cell.
    Hence, the correct option is 'A.'
  • Question 8
    1 / -0
    Which of the following controls permeability?
    Solution
    In plants, the cell wall is dead at maturity and, hence, is fully permeable. The cell membrane is, however, living and is biochemically semi-permeable. The cell membrane allows the solvent to pass through but only selective solutes are allowed to come in or move out. The plasma membrane is, thus, a selectively permeable or semi-permeable membrane.
    Hence, the correct option is A.
  • Question 9
    1 / -0
    A cell is the .......... and functional unit of an organism.
    Solution
    • Cells are called the smallest structural and functional units of life because all the living organisms are made up of cells and also all the functions taking place inside the body of organisms are performed by cells. 
    • So, the correct answer is option B. 
  • Question 10
    1 / -0
    Bricks in a building and cells in the living organisms are 
    Solution
    • Cells are called the structural and functional unit of life because all the living organisms are made up of cells and also all the functions taking place inside the body of organisms are performed by cells. Cells provide specific conditions, for the occurrence of the metabolic reactions. These have specialized enzymes, which catalyze the biochemical reaction and regulates the functions of the body.
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