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KENDRIYA VIDYALAYA, NAD, VISAKHAPATNAM–9

ASSIGNMENT ON CHAPTER THE FUNDAMENTAL UNIT OF LIFE (CELL)

Std.:–IX Subject: Science (Biology) GENERAL INSTRUCTIONS:

(i) All questions are compulsory. (ii) Write the answer numbers as given in the question paper. (iii) Wherever necessary, the diagrams drawn should be neat and properly labelled.

1) Which structure do the cork cells resemble as observed by Robert Hooke? 1 2) State the function of chromosome in a cell. 1 3) What is the importance of osmosis in?

(a) Unicellular organisms (b) plants? 2 4) (a) Why is plasma membrane called selectively permeable membrane?

(b) How is flexible nature of plasma membrane useful for Amoeba? Name this process. 3

5) Name the processes by which CO2 and H2O move into and out of the cell? 1 6) What will happen if: (a) ribosomes are removed from the cell, (b) golgi apparatus is

removed from the cell, (c) plasma membrane ruptures? 3 7) Describe the role played by the Lysosomes. Why these are termed as suicidal bags?

How do they perform their function? 3 8) Explain your observation in the following with reason involved in the process. 3

(a) Salt is applied to raw mango pieces (b) Dried raisins are kept in water for a few hours.

9) (a) What is DNA? Mention its function? Where is it found? (b) Name the functional segment of DNA. 2

10) (a) Name the two types of endoplasmic reticulum (b) What crucial role does it play in the liver cells of vertebrates? (c) Mention it’s any other function. 2

11) How would (i) a plant cell (ii) an animal cell behave when placed in a hypotonic solution of sodium chloride? Explain giving reasons. (Present your answer in a tabular form) 3

12) (a) What would happen to the life of a cell if there was no Golgi apparatus? (Any two)

(b) Which two cell organelles of a cell contain their own genetic material? (c) What happen if the organisation of a cell is destroyed due to some physical or

chemical influence? (1+1+1) =3 13) (a) In the diagram given below identify the part marked B and C.

(d) What are the substances that organelle A stores? (Any two) (e) Mention one function of organelle B and C. 3

SECTION–A (HOTS) & PREVIOUS YEARS QUESTION ANSWERS

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14) Name the cell organelle which is known as ‘Suicidal bags’? Give the reason. 1 15) There is a change of colour from green to reddish during the ripening

of Tomato and Chilly. Explain in context with Cell Biology? 1 16) Enlist any three differences between cell wall and cell membrane. 3 17) If you are provided with some vegetables to cook, we generally add salt to the

vegetables during cooking process. After adding salt, vegetables release water. What mechanism is responsible for this? Explain. 2

18) If cell of onion peel and RBC are separately placed in hypotonic solution, what among the following will take place? Explain the reason. 2 (a) Both the cells will swell (b) RBC will burst early while cells of onion peel will resist bursting to some

extent (c) Both a and b are correct (d) RBC and onion peel cells will behave similarly

19) Mention any three similarities and three differences between mitochondria and plastids/chloroplast. 3

20) Draw neat and labelled (large) diagrams of all the cell organelles found in plant cell

and animal cell. 21) Draw a full page neat and labelled diagram of a plant cell. 22) Draw a full page neat and labelled diagram of an animal cell. 23) Draw a full page neat and labelled diagram of a prokaryotic cell (e.g. bacteria).

Do Well and Excel

Wish You All the Best

SECTION–B ACQUIRING EXTRA KNOWLEDGE