Science - Class 9

Q70. Draw a neat labelled diagram of a plant cell.

 

Q71. Draw a neat labelled diagram of an animal cell.

 

Q72. If cells of onion peel and RBC are separately kept in hypotonic solution, what among the following will take place? Explain the reason for your answer.

(a) Both the cells will swell.

(b) RBC will burst easily while cells of onion peel will resist the bursting to some extent.

(c) Both ‘a’ and ‘b’ are correct.

(d) RBC and onion peel cells will behave similarly.

 

Q73. Match the following:

A		B
(a)	Smooth endoplasmic reticulum	(i)	Amoeba
(b)	Lysosome	(ii)	Nucleus
(c)	Nucleoid	(iii)	Bacteria
(d)	Food vacuoles	(iv)	Detoxification
(e)	Chromatin material and nucleolus	(v)	Suicidal bag

 

Q74. What would happen to the life of a cell if there was no Golgi apparatus? 

 

Q75. Differentiate between rough and smooth endoplasmic reticulum. How is endoplasmic reticulum important for membrane biogenesis?

 

Q76. Carry out the following osmosis experiment:

Take four peeled potato halves and scoop each one out to make potato cups. One of these potato cups should be made from a boiled potato. Put each potato cup in a trough containing water.

Now,

(a) Keep cup A empty

(b) Put one teaspoon sugar in cup B

(c) Put one teaspoon salt in cup C

(d) Put one teaspoon sugar in the boiled potato cup D.

Keep these for two hours. Then observe the four potato cups and answer the following:

(i) Explain why water gathers in the hollowed portion of B and C.

(ii) Why is potato A necessary for this experiment?

(iii) Explain why water does not gather in the hollowed out portions of A and D. 

 

Q77. In brief state what happens when

(a) Dry apricots are left for some time in pure water and later transferred to sugar solution.

(b) A red blood cell is kept in concentrated saline solution.

(c) The plasma membrane of a cell breaks down.

(d) Rheo leaves are boiled in water first and then a drop of sugar syrup is put on it.

(e) Golgi apparatus is removed from the cell.