Yes, all living organisms on planet earth require a cell because the cell is a basic structural and functional unit of life.

They are STRUCTURAL UNIT as they form the structure of the organism.

They are building blocks of life like bricks of building. Bricks combine to form walls, walls combine to form rooms which further combine to form one floor and floors combine to form building.
In similar way, cells combine to form tissues, tissues combine to form organs which further combine to form organic systems and organ system combine to form organism.

They are FUNCTIONAL UNIT as all the functions carried out by us are the functions carried out by cells.

The human body is composed of trillions of cells. Some cells take in nutrients from food, convert those nutrients into energy, and carry out specialized functions. Some cells also contain the body’s hereditary material, so make copies of themselves.

In unicellular organism single cell performs all of its life functions. In complex organisms, like plants and animals, millions of cells combine to form organs and perform different jobs….

2 comments to “IS CELL NECESSARY FOR LIFE ?”

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  1. Subodh - October 29, 2018 Reply

    what are the common characteristics of life?

    • Questions House - February 13, 2019 Reply

      Common caracteristics of life:

      1. Living things are composed of cells. As cells are the basic structural and functional unit of life. All the functions we perform are basically performed by cells as cells make required proteins or necessary elements for the function. Living things are organised at different levels of organisation. Thus, cells are structural unit of life also.

      2. Living things have heredity. Heredity is passing of traits from parents to offspring. Traits are passed when they reproduce and reproduction is the characteristic of living things. DNA is the unit of heredity

      3. Living things have metabolism which means they take in energy for making food and growth as they perform chemical reactions of life.

      4. Living things have homeostasis such as we shiver to keep our body warm. Thus, it is the process by which an organism maintain stability for its survival.

      5. Growth is main characteristic of living things. Can table grow in size? Plants, humans etc. can grow to a certain size and then divide.

      6. Living things can reproduce which is necessary for survival of species. Living things can reproduce by asexual repoduction or sexual reproduction.

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