Assignment class IX (try to do it yourself if doubt may refer to A key given below)

Q1 What is the definition of cell?

Q2 Name the part of of cell where respiration takes place and what is the form in which energy is generated?

Q3 write which type of Plastids are present in
 (a) fruits
(b) green leaves

Q4 What is gene? what is it made up of?

Q5 what is the type of cell Divison required for growth ?

Q6 What will happen if we place egg immediately from fridge to boiling ?what change would happen if we put some salt in the water where egg is boiling ?

Q7 what is the difference between Rough ER and Smooth ER ?

Q8 what is  the function of Ribosomes?

Q9 What is constitution of cell membrane and that of cell wall?

Q10 What will happen to plant cell when it is placed in (a) hypertonic solution and an animal cell is placed in hypotonic solution for long?
Answer key(clues)

A1 structural and functional unit of life

A2  Mitochondrion and energy is generated in the for of a chemical called ATP (adenosine triphosphate)

A3 (a) Leucoplast
      (b) Chloroplast

A4 Gene is  unit of information located on chromosomes made up of DNA(Deoxyribose nucleic acid)

A5 Mitosis is the type of cell division required for growth as it makes daughter cells which carry all the information present in mother cell.

A6it will burst because of endo-osmosis.If we put salt the solution outside will become hypertonic and egg will lose water and not burst.

A7 A8RER hss ribosomes attached and helps in protein synthesis where as SER doen't  have ribosomes attached to it and it's function is lipid synthesis.

 A8 Ribosomes are involved in protein synthesis.

A9 cell membrane is made up of two layers of lipids and in between are proteins sandwiches .cell wall is made up of cellulose(a complex carbohydrate)

A10 (a) plant cell will lose water and membrane will shrink this is called plasmolysis
       (b) Animal cell will swell due t endo  osmosis and if s continued to be kept  then the animal cell would burst.