Class 9. Students must watch in this about some important questions

Fundamental unit of life :cell

Q.1 Difference between diffusion and osmosis

Ans.1  Diffusion:some substance can across
the plasma membrane through A process called diffusion

Osmosis :it is type of diffusion but in water
                       Diffusion                        osmosis
1.diffusion can occur in    |  1.it occur  only              any medium             in liquid medium
2.the diffusion molecule   |    2.it involves
May be solid, liquid, gas.   |  Movement of 
                                               |solvent molecule
                                               |only
3.semipermeable mem-.     3.semipermeable
brane is not required.           Membrane is 
                                                   required


2Q. Difference between cell wall or plasma membrane

Ans. Cell wall : It occur in plant cells
   Plasma membrane: It's found in both plants and animals cells
 Cell wall: it's non living and quite thick in plant cells
Plasma membrane: It's living and quite thin
Cell wall: It's rigid
Plasma membrane: it's flexible
Cell wall:it is generally permeable
Plasma membrane: It is selectively permeable
Cell wall: it's formed of cellulose, hemicellulose and pectin.
Plasma membrane:it is formed lipids and protein
 Cell wall: to provide protection and strength to the cell.
Plasma membrane: hold cellular content and control passage of material in or out of the cell

Q.3 Inside cell which cell organ  have ribosome 
 Ans. Endoplasmic reticulum, Nucleus. 
Q4. Which organ is called power house of the cell 
Ans: mitochondria

Q5.why are lysosome are called suicide bags?
Ans. During the cell structure, when the cell get damaged, lysosome may brust and enzymes eat up their own cells. Therefore , lysosome are also known as suicide bags of cells
    

Some other important questions of this chapter in next post 

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