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Ncert Solutions For Class 9 Science Chapter 5 the Fundamental Unit of Life

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Download NCERT Solutions for Class 9 Science

Chapter 5 The Fundamental Unit of Life

(Link of Pdf File is given below at the end of the Questions List)

In this pdf file you can see answers of following Questions


NCERT Solutions Question Page no. 59


Question 1. Who discovered cells, and how?


Question 2. Why is the cell called the structural and functional unit of life?


NCERT Solutions Question Page no.61


Question 1. How do substances like CO2 and water move in and out of the cell? Discuss.


Question 2. Why is the plasma membrane called a selectively permeable membrane?


NCERT Solutions Question Page no. 63


Question 1. Fill in the gaps in the following table illustrating differences between prokaryotic and eukaryotic cells.


NCERT Solutions Question Page no. 65


Question 1. Can you name the two organelles we have studied that contain their own genetic material?


Question 2. If the organisation of a cell is destroyed due to some physical or chemical influence, what will happen?


Question 3. Why are lysosomes known as suicide bags?


Question 4. Where are proteins synthesised inside the cell?


NCERT Solutions Exercises Questions


Question 1. Make a comparison and write down ways in which plant cells are different from animal cells.


Question 2. How is a prokaryotic cell different from a eukaryotic cell?


Question 3. What would happen if the plasma membrane ruptures or breaks down?


Question 4. What would happen to the life of a cell if there was no Golgi apparatus?


Question 5. Which organelle is known as the powerhouse of the cell? Why?


Question 6. Where do the lipids and proteins constituting the cell membrane get synthesised?


Question 7. How does an Amoeba obtain its food?


Question 8. What is osmosis?


Question 9. Carry out the following osmosis experiment: Take four peeled potato halves and scoos 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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