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The Fundamental Unit of Life — Science STD 9 — Question

CBSE BoardEnglish MediumSTD 9ScienceThe Fundamental Unit of Life1 Mark
MCQ
Which among the following is correctly represented?
  • A
    Cell → tissue → organ → organ system → organism.
  • B
    Organism → organ → organ system → tissue → cell.
  • C
    Cell → tissue → organ system → organism → organ.
  • D
    None of the above.
✓

Answer

  1. Cell → tissue → organ → organ system → organism.

Explanation:

Cells are called as 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. A group of cells, which are structurally similar and or work together to perform a particular function are called as tissue. The collection of such tissues, which are joined in a structural unit to perform a certain function is called as an organ. An organ system is a group of organs that work together to perform one or more functions, e.g., heart, blood and blood vessels work together as a circulatory system. Organ systems work together and carry out normal functions of life, which forms an organism.

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