CELL-A BASIC UNIT OF LIFE 9

Practice Paper

Subject Biology (2020)

CH-5 Cell- A basic unit of life 

Class IX

I. Very Short answer type questions:

1. What are living organisms made up of?
2. Cells were first discovered by whom?
3. What are the unicellular and multicellular organisms?
4. Who coined the term ‘protoplasm’ for the fluid substance of the cell?
5. Who discovered the nucleus in the cell?
6. Write the name of three features that are present in almost every cell and all activities inside the cell and interactions of the cell with its environment are possible due to these features.
7. What is cell theory?
8. Which organelle have their own DNA and ribosomes so they are able to make some of their own proteins.
9. Write the name of three unicellular organisms.
10. Define osmosis.
11. Define diffusion.
12. What is the full form of DNA?
13. What is the full form of RNA?
14. What is the gene?
15. State the function of chromosomes in a cell.
16. What are cell organelles?
17. What are cellulose and its function?
18. Why is it said that "a cell without nucleus is without any feature"?
19. What do you mean by nucleoid?
20. Write the function of Chromatin material!
21. What role does a nucleus play in cellular reproduction?
22. What is the function of DNA?
23. What is cellulose?
24. What is plasma membrane?
25. What is the plasma membrane made up of?

II. Short answer type questions:

1. Why the cell membrane is called a selectively permeable membrane.
2. What will happen if we put an animal cell or a plant cell into a solution of sugar or salt in water?
3. What is the role of SER?
4. What do you mean by endocytosis? Write the name of an organism that acquires its food through such processes.
5. What is the function of chromosomes?
6. What is stroma?
7. Which organelles of the plant cell are similar to mitochondria?
8. What do you mean by plasmolysis?
9. How are vacuoles in plant cells different from those in animal cells?
10. What is a centrosome and what function does it perform?
11. Describe in short that chief components of a nucleus.
12. Why mitochondria are also referred to as strange organelles?
13. Distinguish between cell wall and cell membrane.
14. What is the cell wall? What is a cell wall made up of?
15. Write the main functions of the cell wall.
16. Give any two functions of plastids.
17. Give any two functions of plasma membrane.
18. Name two nucleic acids present in the cell and their function.
19. Write two similarities and one of the dissimilarities between mitochondria and plastid.
20. Division of labor exists even at the intracellular level. Justify the statement.
21. Define osmosis. In what two ways it is different from diffusion?
22. Draw and label the parts of prokaryotic cell.
23. Name three types of plastids found in plant cells and give one function of each.
24. What is the name given to the thread shaped structures in the nucleus? Why is it important?
25. How does the movement of substances take place into the cell?
26. List any two single-celled organisms.  
27. Name
    (a) The main constituent substance present in the plant cell wall.
    (b) A cell organelle which lacks membrane. Two nucleic acids present in the cell. 

III. Long answer type questions:

1. What will happen if we put an animal cell or a plant cell into a solution of sugar or salt in water?
2. What is the endoplasmic reticulum? Name the two types of the endoplasmic reticulum. Write its main function.
   (a)List any two structural differences and two similarities between a plant cell and an animal cell.
   (b) What would happen if an animal cell is kept in distilled water for 24 hours?
3. Write the structure and functions of ER.
4. Write the differences between hypotonic and isotonic solutions.
   (a)Write two points of difference between the nuclear region of a bacterial cell and a region of an animal cell.
   (b) Which structure present in the nucleus of a living cell bear genes?
5. Draw a diagram of a plant cell and label it's any for parts.
6. Mention any three feature of prokaryotic cells.
7. Write the differences between prokaryotic and eukaryotic cells.
8. Differentiate between rough and smooth endoplasmic reticulum. How is the endoplasmic reticulum important for membrane biogenesis?
9. Write one function each of ribosomes, vacuole, and plasma membrane.
10. Describe the role played by the lysosomes in a Cell.Why these are termed as suicidal bags? How do they perform their function?
11. Distinguish leucoplast from chromoplast based on one feature. Give an example of chromoplast present in plant cell .What is the function of chromoplast in the plant cell?
12. Give two points of difference between diffusion and osmosis. o give their term Golgi apparatus? Name one cell organelles that are formed by the Golgi apparatus. Write any two functions of the Golgi apparatus.
13. Endocytosis is found only in animals. State and explain the process by which an amoeba obtains its food.
14. A cell is the fundamental structural unit of living organisms. It is also the basic functional unit of life. Explain it.
15. Write the functions of the following organelles in a cell:
    chloroplast (ii) nucleus (iii) ribosomes.
16. Two beakers A&B contain plain water and concentrated sugar solution respectively, an equal number of dry raisins are kept in them for a few hours and then taken out. Explain the reason for the difference in the physical appearance of raisins which were taken out of the two beakers on the basis of the above observation category is that two solutions as hypotonic and hypertonic.
17. Which cell organelles would you associate with ATP Productions? How is this organization to make its own protein?
18. A student performed an experiment by placing the de-shelled egg .in a concentrated salt solution for 5 minutes. What changes did he observe in the egg? Give the reason for the same.
19. (a)Why the cell is called the structural and functional unit of life?

    (b)Why the plasma membrane is called a selectively permeable membrane?
    (c)Name the factors which decide the movement of water across the plasma membrane.
20. State reasons for the following: Mentioned the use of deep folding in the inner membrane of mitochondria. Plastids are able to make their own protein. Plant cells shrink when kept in a hypertonic solution.
21. What is membrane biogenesis? Explain what happens when a drop of concentrated sugar solution is placed on a rheo leaf peel mounted on a glass slide? Name this phenomenon. Would the same happen if the rheo leaf was boiled before mounting? Give the reason for your answer.
22. What would happen if the plasma membrane rupture or breaks down? What would happen to the life of a cell if there were no Golgi apparatus?
23. Describe the structure of the plant cell.
24. Write the position, function and structure of different cell organelles.
25. Draw a diagram of the nucleus to show the given parts:
    (a) Nucleolus (b) Nuclear pore (c) Nuclear envelope,
26. Explain the term (a) endocytosis (b) plasmolysis.
27. (a)What will happen if the organization of a cell is damaged due to certain physical or chemical reasons?
    (b) How do substances like CO₂ and water move in and out of the cell?
28. Differentiate between chromatin and chromosomes.
29. Mention the difference between prokaryotes and eukaryotes in terms of nuclear reason present in them. 
30. Name: 
    (a )The process through which amoeba acquires its food from the external environment.
    (b) Name cell organelles that are termed as suicidal bags of the cell and have membrane-bound sac filled with powerful digestive enzymes.
    (c)Two cell organelles that contain their own genetic material.
    (d)Site of energy release inside the cell.
31. Name:
    (a) The kind of plastid is important for photosynthesis in the leaves of the plants.
    (b)The cell organelle that detoxifies poisons and drugs into the liver of vertebrates. 
    (c) Two cell organelles having a double-membrane envelope.
    (d) Two materials stored in leucoplasts.
32. Name
    (a)The organelles are associated with protein synthesis.
    (b) Two components of chromosomes.
    (c) The cell has changed shape.
    (d) The cell has a typical shape. 
33. Name:
    (a) The plastid involved in the conversion of green brinjal to violet.
    (b) The powerhouse of the cell.
    (c) Cell organelle is responsible for intercellular transport.
    (d) The functional unit of the gene. 
34. How does a living cell perform these basic functions?

NCERT QUESTIONS:

1. Who discovered cells, and how?
2. Why the cell is called the structural and functional unit of life?
3. How do substances like CO2 and water move in and out of the cell? Discuss.
4. Why the plasma membrane is called a selectively permeable membrane?
5. Fill in the gaps in the following table illustrating differences between prokaryotic and eukaryotic cells.
   

   Prokaryotic  Cell	Eukaryotic Cell
   1. Size: generally small 2. Nuclear region: and known as ___ 3. Chromosome: single 4. Membrane _____bound cell organelles absent.	1. Size: Generally large 2. Nuclear region: well defined and surrounded by a nuclear membrane. 3. More than one chromosome. 4. ______________________

6.  Can you name the two organelles we have studied that contain their own genetic material?
7. If the organization of a cell is destroyed due to some physical or chemical influence, what will happen?
8. Why are lysosomes known as suicide bags?
9. Where are proteins synthesized inside the cell?
10. Make a comparison and write down ways in which plant cells are different from animal cells. 
11. How is a prokaryotic cell different from a eukaryotic cell? 
12. What would happen if the plasma membrane ruptures or breaks down?
13. What would happen to the life of a cell if there was no Golgi apparatus?
14. Which organelle is known as the powerhouse of the cell? Why? 
15. Where do the lipids and proteins constituting the cell membrane get synthesized?
16. How does an Amoeba obtain its food?
17. What is osmosis?
18. 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.
19. Fill in the blanks:

1. The fundamental organizational unit of life is the ______. 
2. Cells are enclosed by a plasma membrane composed of _______ and ________.
3. The cell membrane is an active part of the cell. It regulates the _________ of materials between the ordered interior of the cell and the outer environment.
4. In plant cells, a cell wall composed mainly of _________ is located outside the cell membrane.
5.  The presence of the cell wall enables the cells of plants, fungi, and bacteria to exist in _______ media without bursting.
6. The nucleus in ________ is separated from the cytoplasm by a double-layered membrane and it directs the _________ of the cell.
7.  The ______functions both as a passageway for intracellular transport and as a manufacturing surface.
8. The _________ consists of stacks of membrane-bound vesicles that function in the storage, modification and packaging of substances manufactured in the cell.
9. Most plant cells have large membranous organelles called plastids, which are of two types – ________and _________.
10.  Chromoplasts that contain chlorophyll are called _______ and they perform_________.
11.  The primary function of leucoplasts is __________.
12. Most mature plant cells have a large central vacuole that helps to maintain the _______of the cell and stores important substances including wastes.
13. _________ cells have no membrane-bound organelles, their chromosomes are composed of only nucleic acid, and they have only very small __________.

CHAPTER 1 - MATTER IN OUR SURROUNDINGS	☛ QUESTION WITH SOLUTIONS
CHAPTER 2 - IS MATTER AROUND US PURE?	☛QUESTION WITH SOLUTIONS
CHAPTER 3 - ATOMS AND MOLECULES	☛ QUESTION WITH SOLUTIONS
CHAPTER 4 - STRUCTURE OF ATOM	☛   QUESTION WITH SOLUTIONS
CHAPTER 5 -  THE FUNDAMENTAL UNIT OF LIFE
CHAPTER 6 -  TISSUE
CHAPTER 7 -   DIVERSITY IN LIVING ORGANISM
CHAPTER 8 -  MOTION	☛ QUESTION WITH SOLUTIONS
CHAPTER 9 -  FORCE AND LAW OF MOTION	☛  QUESTION WITH SOLUTIONS
CHAPTER 10 - GRAVITATION	☛ QUESTION WITH SOLUTIONS
CHAPTER 11 -  WORK AND ENERGY
CHAPTER 12 -  SOUND
CHAPTER 13-  WHY DO WE FALL ILL
CHAPTER 14 - NATURAL RESOURCES
CHAPTER 15 - IMPROVEMENT OF FOOD RESOURCES