Question

Q12. state reason for the following:-



a)Cell is called as the structural and functional unit of life.

b)Plastids are able to make their own protein

c) Plant cells shrink when kept in hypertonic solution.

Answer 1

Answer:

• A cell is called as the fundamental structural and functional unit of life because they form the building blocks (bricks) of the main organs of organisms. The cells are the basic parts of all organs. These cells in group forms tissues that have specialized function and these tissues together form the organs. It is functional unit of life because the cells carry out all the functions of body (physiological, biochemical. genetic and other functions)
• Nucleus, mitochondria, and plastids have DNA; hence they are able to make their own structural proteins.
• When a cell is kept in hypertonic solution for a long time it shrinks. The water inside the cell moves out as the concentration outside the cell is higher. As a result, the cell shrinks. This is also known as plasmolysis.