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  • Malaysia's leader said on Saturday communications aboard a missing jet were switched off and its course deliberately changed by someone on board before the aircraft disappeared a week ago, but stopped short of saying it had been hijacked.

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  • Finally, the TRS chief K Chandrashekhara Rao has broken his silence over possibility of an alliance with the Congress in Telangana. After saying a firm 'no' to merger with the Congress, KCR has now ruled out any alliance with the Congress in both Assembly and Lok Sabha elections to be held on April 30.

  • The Bharatiya Janata Party's much anticipated list of Lok Sabha candidates is expected shortly which will end the the suspense over who will contest from Varanasi - its prime ministerial candidate Narendra Modi or party veteran Murli Manohar Joshi.

  • The Delhi High Court has confirmed death penalty to all four convicts of the December 16 Delhi gangrape and murder case. The four were convicted in September 2013 for raping and murdering a 23-year-old paramedical student.

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    Home >> Biology >> The Fundamental Unit Of Life

    The Fundamental Unit Of Life

    Cell theory

    The cell theory stated that all plants and animals are composed of cell and that cell is the basic unit of life and that all cells arise from pre-existing cells.

    Who discovered cell and how?

    Robert Hooke discovered cell. He looked on to a piece of cork through his self-designed microscope. He saw small boxes in the shape of a honeycomb and thus he named them cell that means a little room.

    Unicellular Organism

    The organisms that have only one cell but that cell perform all the life functions like respiration or reproduction etc.

     

    Multicellular Organism

    The organisms which are made up of many cells. These cells perform specific functions and make tissues then organs and organ system and perform all the functions of life.

    Diffusion

    Movement of particles from a region of high concentration to a region of low concentration is diffusion.

    Osmosis

    It is the movement of water from a region of high concentration through a semi-permeable membrane to a region of low water concentration. 

    Hypotonic solution

    Solution outside the cell is dilute. The cell will gain water as the solution has more water than the cell.

    Isotonic solution

    If the solution has exactly the same amount of water as the cell there will be no movement of water.

    Hypertonic solution

    If the solution has less concentration of water than the cell, the cell will loose water by osmosis.

     

     

    Plasmolysis

    The phenomenon of shrinkage of protoplast from the cell wall due to exosmosis in a plant cell when placed in a hypertonic solution is called plasmolysis.

     How do substances like co2 and water move out of the cell?

    These substances move out by the process of diffusion and osmosis.

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