9th Class Science The Fundamental Unit of Life Question Bank 9th CBSE Science The Fundamental Unit of Life

  • question_answer
      Why is plasma membrane called a selectively permeable membrane? How do the substances like  and water move in and out of cell?

    Answer:

                      The plasma membrane permits the entry and exit of some material in and out of cell. It also prevent the movement of cell content outside the cell. Hence, it is called selectively permeable membrane.                                    (1) Substance like  move in and out of cell by the process of diffusion and water moves in and out of the cell by the process of osmosis.                  (1)


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