THE FUNDAMENTAL UNIT OF LIFE

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  • THE FUNDAMENTAL UNIT OF LIFE Assignments 1

    Draw a neat diagram of plant cell and label any three parts which
    differentiate it from animal cell.

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  • THE FUNDAMENTAL UNIT OF LIFE Assignments 2

    In brief state what happens when
    (a) dry apricots are left for sometime in pure water and later transferred to
    sugar solution?
    (b) a Red Blood Cell is kept in concentrated saline solution?
    (c) the Plasma-membrane of a cell breaks down?
    (d) rheo leaves are boiled in water first and then a drop of sugar syrup is
    put on it?
    (e) golgi apparatus is removed from the cell?

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  • THE FUNDAMENTAL UNIT OF LIFE Assignments 3

    Differentiate between rough and smooth endoplasmic reticulum. How is
    endoplasmic reticulum important for membrane biogenesis?

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  • THE FUNDAMENTAL UNIT OF LIFE Assignments 4

    Draw a well labelled diagram of an eukaryotic nucleus. How is it different
    from nucleoid?

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  • THE FUNDAMENTAL UNIT OF LIFE Assignments 5

    Draw a neat labelled diagram of an animal cell.

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  • THE FUNDAMENTAL UNIT OF LIFE Assignments 6

    Illustrate only a plant cell as seen under electron microscope. How is it
    different from animal cell?

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  • THE FUNDAMENTAL UNIT OF LIFE Assignments 7

    Draw a plant cell and label the parts which
    (a) determines the function and development of the cell
    (b) packages materials coming from the endoplasmic reticulum
    (c) provides resistance to microbes to withstand hypotonic external media
    without bursting
    (d) is site for many biochemical reactions necessary to sustain life.
    (e) is a fluid contained inside the nucleus

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  • THE FUNDAMENTAL UNIT OF LIFE Assignments 8

    What are the consequences of the following conditions?
    (a) A cell containing higher water concentration than the surrounding
    medium
    (b) A cell having low water concentration than the surrounding medium.
    (c) A cell having equal water concentration to its surrounding medium.

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  • THE FUNDAMENTAL UNIT OF LIFE Assignments 9

    How are chromatin, chromatid and chromosomes related to each other?

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  • THE FUNDAMENTAL UNIT OF LIFE Assignments 10

    Why do plant cells possess large sized vacuole?

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  • THE FUNDAMENTAL UNIT OF LIFE Assignments 11

    Which kind of plastid is more common in
    (a) roots of the plant
    (b) leaves of the plant
    (c) flowers and fruits

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  • THE FUNDAMENTAL UNIT OF LIFE Assignments 12

    Which cell organelle controls most of the activities of the cell?

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  • THE FUNDAMENTAL UNIT OF LIFE Assignments 13

    Why are lysosomes also known as “scavengers of the cells”?

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  • THE FUNDAMENTAL UNIT OF LIFE Assignments 14

    Name the two organelles in a plant cell that contain their own genetic
    material and ribosomes.

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  • THE FUNDAMENTAL UNIT OF LIFE Assignments 15

    How does amoeba obtain its food?

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  • THE FUNDAMENTAL UNIT OF LIFE Assignments 16

    How is a bacterial cell different from an onion peel cell?

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  • THE FUNDAMENTAL UNIT OF LIFE Assignments 17

    Name the organelles which show the analogy written as under
    (a) Transporting channels of the cell——
    (b) Power house of the cell——
    (c) Packaging and dispatching unit of the cell——
    (d) Digestive bag of the cell——
    (e) Storage sacs of the cell——
    (f) Kitchen of the cell——
    (g) Control room of the cell——

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  • THE FUNDAMENTAL UNIT OF LIFE Assignments 18

    Write the name of different plant parts in which chromoplast, chloroplast
    and leucoplast are present.

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  • THE FUNDAMENTAL UNIT OF LIFE Assignments 19

    Match the following A and B
    (A)                                                                        (B)
    (a) Smooth endoplasmic reticulum                            (i) Amoeba
    (b) Lysosome                                                          (ii) Nucleus
    (c) Nucleoid                                                            (iii) Bacteria
    (d) Food vacuoles                                                    (iv) Detoxification
    (e) Chromatin material and nucleolus                       (v) Suicidal bag

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  • THE FUNDAMENTAL UNIT OF LIFE Assignments 20

    Bacteria do not have chloroplast but some bacteria are photoautorophic
    in nature and perform photosynthesis. Which part of bacterial cell performs
    this?

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  • THE FUNDAMENTAL UNIT OF LIFE Assignments 21

    Bacteria do not have chloroplast but some bacteria are photoautorophic
    in nature and perform photosynthesis. Which part of bacterial cell performs
    this?

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  • THE FUNDAMENTAL UNIT OF LIFE Assignments 22

    Bacteria do not have chloroplast but some bacteria are photoautorophic
    in nature and perform photosynthesis. Which part of bacterial cell performs
    this?

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  • THE FUNDAMENTAL UNIT OF LIFE Assignments 23

    If cells of onion peel and RBC are separately kept in hypotonic solution,
    what among the following will take place? Explain the reason for your
    answer.
    (a) Both the cells will swell.
    (b) RBC will burst easily while cells of onion peel will resist the bursting to
    some extent.
    (c) a and b both are correct.
    (d) RBC and onion peel cells will behave similarly.

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  • THE FUNDAMENTAL UNIT OF LIFE Assignments 24

    If you are provided with some vegetables to cook. You generally add salt
    into the vegetables during cooking process. After adding salt, vegetables
    release water. What mechanism is responsible for this?

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  • THE FUNDAMENTAL UNIT OF LIFE Assignments 25

    We eat food composed of all the nutrients like carbohydrates, proteins,
    fats, vitamins, minerals and water. After digestion, these are absorbed in
    the form of glucose, aminoacids, fatty acids, glycerol etc.
    What mechanisms are involved in absorption of digested food and water?

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  • THE FUNDAMENTAL UNIT OF LIFE Assignments 26

    Name any cell organelle which is non membranous.

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  • THE FUNDAMENTAL UNIT OF LIFE Assignments 27

    A person takes concentrated solution of salt, after sometime, he starts
    vomiting. What is the phenomenon responsible for such situation? Explain.

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  • THE FUNDAMENTAL UNIT OF LIFE Assignments 28

    Why is endocytosis found in animals only?

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  • THE FUNDAMENTAL UNIT OF LIFE Assignments 29

    Why does the skin of your finger shrink when you wash clothes for a long
    time?

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  • THE FUNDAMENTAL UNIT OF LIFE Assignments 30

    Do you agree that “A cell is a building unit of an organism”. If yes, explain
    why?

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  • THE FUNDAMENTAL UNIT OF LIFE Assignments 31

    Why are lysosomes known as ‘suicide-bags’ of a cell?

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  • THE FUNDAMENTAL UNIT OF LIFE Assignments 32

    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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  • THE FUNDAMENTAL UNIT OF LIFE Assignments 33

     

    What is osmosis?

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  • THE FUNDAMENTAL UNIT OF LIFE Assignments 34

     How does an Amoeba obtains its food?

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  • THE FUNDAMENTAL UNIT OF LIFE Assignments 35

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

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  • THE FUNDAMENTAL UNIT OF LIFE Assignments 36

     

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

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  • THE FUNDAMENTAL UNIT OF LIFE Assignments 37

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

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  • THE FUNDAMENTAL UNIT OF LIFE Assignments 38

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

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  • THE FUNDAMENTAL UNIT OF LIFE Assignments 39

    How is a prokaryotic cell different from a eukaryotic cell?

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  • THE FUNDAMENTAL UNIT OF LIFE Assignments 40

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

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  • THE FUNDAMENTAL UNIT OF LIFE Assignments 41

    Where are proteins synthesized inside the cell?

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  • THE FUNDAMENTAL UNIT OF LIFE Assignments 42

    Why are lysosomes known as suicide bags?

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  • THE FUNDAMENTAL UNIT OF LIFE Assignments 43

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

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  • THE FUNDAMENTAL UNIT OF LIFE Assignments 44

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

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  • THE FUNDAMENTAL UNIT OF LIFE Assignments 45

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

     

    Prokaryotic cell

    		  

    Eukaryotic cell

    1.

    Size: generally small ( 1-10 µm) 1 µm== 10-6 m

    1.

    Size: generally large (5-100 µm)

    2.

    Nuclear region: _____________________________ and is known as ________.

    2.

    Nuclear region: well-defined and surrounded by a nuclear membrane

    3.

    Chromosome: single

    3.

    More than one chromosome

    4.

    Membrane-bound cell organelles are absent

    4.

    ________________________________________________________________________________________________

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  • THE FUNDAMENTAL UNIT OF LIFE Assignments 46

    Why is the plasma membrane called a selectively permeable membrane?

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  • THE FUNDAMENTAL UNIT OF LIFE Assignments 47

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

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  • THE FUNDAMENTAL UNIT OF LIFE Assignments 48

     

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

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  • THE FUNDAMENTAL UNIT OF LIFE Assignments 49

     

    Who discovered cells and how?

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