Question

i)Why is the cell called the structural and functional unit of life?

ii)Why is the plasma membrane called a selectively permeable

membrane?

iii)Name the factor which decides the movement of water​

Answer 1

ANS I) Cell is called structural unit because body of all the organisms is made up of cells. It is functional unit of life because all the functions of body (physiological, biochemical. genetic and other functions) are carried out by cells.

ANS II) The plasma membrane is called as selectively permeable membrane because it regulates the movement of substances in and out of the cell. It means that the plasma membrane allows some material to pass through it while at the same time it blocks other material from entering through it.

ANS III) Osmosis is a factor decides the movement of water.

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Answer 2

i). • Cell is called the structural unit of life because every body is made up of cells.

• Cell is called the functional unit of life because even a single cell can perform all the functions that occur in the most developed body

ii). Because it allows only certain materials to pass (in and out) through it.

III). --> concentration of solution

--> Osmosis

--> Diffusion