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Cell : The Unit of Life

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
Multicellular organisms have division of labour. Explain.

Unlike unicellular cells which have only one cells that perform all the functions, multicellular organisms have many cells. In multicellular organisms the cells perform specific functions. All the cell performing similar function are organized into group to form tissues. This is called division of labour as different functions are performed by different group of cells. For example the nervous tissue conducts signals to all parts of the body while epitheliat tissur forms the covering of the body and provides protection.  


What is the function of contractile vacuole in amoeba?


State one difference between gram positive and gram negative bacteria.

Gram positive bacteria retains the gram stain whereas the Gram negative bacteria does not. 

Who concluded, “Cells are the ultimate units forming the structure of all plant tissues”?

Mathias Schleiden.

Who reported that the cell had an outer layer which is known as plasma membrane today?

Theodore Schwann 

 What are receptor molecules ?

Receptor molecules are specific proteins in the cell's plasma membrane that receive chemical signals from outside the cell. When such chemical signals bind to a receptor, they cause some form of cellular response.