Q7 of 18 Page 66

How does an Amoeba obtain its food?

Amoeba obtain its food through the process of endocytosis. The plasma membrane of Amoeba is flexible which help to engulf its food particles and other material from its external environment.


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5

Which organelle is known as the powerhouse of the cell? Why?

 6

Where do the lipids and proteins constitution the cell membrane get synthesized?

 8

What is osmosis?

 9

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 into 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 2 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 porato A necessary for this experiment?


(iii) Explain why water does not gather in the hollow out portion of A and D?