Class 9 Science
The Fundamental Unit of Life
Q.1
Make a comparison to write down ways in which plant cells are different from animal cells.
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Q.2
How is a prokaryotic cell different from a eukaryotic cell?
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Q.3
What would happen if the plasma membrane ruptures or breaks down?
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Q.4
What would happen to the life of a cell if there is no Golgi apparatus?
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Q.5
Which organelle is known as the powerhouse of the cell? Why?
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Q.6
Where do the lipids and proteins constituting the cell membrane get synthesised?
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Q.7
How does Amoeba obtain its food?
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Q.8
What is osmosis?
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Q.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 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.
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Q.10
Which type of cell division is required for growth and repair of body and which type is involved in formation of gametes?
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