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Biology · Textbook solutions

Cell Division

Every solved example, exercise, and miscellaneous question, in the order the textbook teaches them. · 26 questions

Exercise

26 q

Q1. Choose correct option

Practice · 9
  1. Choose correct option
    Ex Q1(A)
    The connecting link between Meiosis-I and Meiosis-II is ...............

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  2. Ex Q1(B)
    Synapsis is pairing of .............

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  3. Ex Q1(C)
    Spindle apparatus is formed during which stage of mitosis?

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  4. Ex Q1(D)
    Chromosome number of a cell is almost doubled up during ...............

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  5. Ex Q1(E)
    How many meiotic divisions are necessary for formation of 80 sperms?

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  6. Ex Q1(F)
    How many chromatids are present in anaphase-I of meiosis-I of a diploid cell having 20 chromosomes?

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  7. Ex Q1(G)
    In which of the following phase of mitosis chromosomes are arranged at equatorial plane?

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  8. Ex Q1(H)
    Find incorrect statement -

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  9. Ex Q1(I)
    Histone proteins are synthesized during ......

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Q2. Answer the following questions

Practice · 9
  1. Answer the following questions
    Ex Q2(A)
    While observing a slide, student observed many cells with nuclei. But some of the nuclei were bigger as compared to others but their nuclear membrane was not so clear. Teacher inferred it as one of the phase in the cell division. Which phase may be inferred by teacher?
  2. Ex Q2(B)
    Students prepared a slide of onion root tip. There were many cells seen under microscope. There was a cell with two groups of chromosomes at opposite ends of the cell. This cell is in which phase of mitosis?
  3. Ex Q2(C)
    Students were shown some slides of cancerous cells. Teacher made a comment as if there would have been a control at one of its cell cycle phase, there wouldn’t have been a condition like this. Which phase the teacher was referring to?
  4. Ex Q2(D)
    Some Mendelian hybridization experimental results were shown to the students. Teacher informed that there are two genes located on the same chromosome. He enquired if they will be ever separated from each other?
  5. Ex Q2(E)
    Students were observing a film on Paramoecium. It underwent a process of reproduction. Teacher said it is due to cell division. But students objected and said that there was no disappearnce of nuclear membrane and no spindle formation, how can it be cell division? Can you clarify?
  6. Ex Q2(F)
    Is the meiosis responsible for evolution? Justify your answer.
  7. Ex Q2(G)
    Why mitosis and meiosis-II are called as homotypic division?
  8. Ex Q2(H)
    Write the significance of mitosis.
  9. Ex Q2(I)
    Enlist the different stages of prophase-I.

Q3. Draw labelled digrams and write explanation -

Practice · 3
  1. Draw labelled digrams and write explanation -
    Ex Q3(A)
    With the help of suitable diagram, describe the cell cycle.
  2. Ex Q3(B)
    Distinguish between mitosis and meiosis.
  3. Ex Q3(C)
    Draw the diagram of metaphase.

Q4. Match the following column-A with column-B and rewrite

Practice · 1
  1. Ex Q4
    Match the following column-A with column-B and rewrite.
    Column-A (phases)Column-B (Their events)
    a. Leptotene1. Crossing over
    b. Zygotene2. Desynapsis
    c. Pachytene3. Synapsis
    d. Diplotene4. Bouquet stage

Q5. Is a given figure correct?

Practice · 1
  1. Ex Q5
    Is a given figure correct? why?

Q6. If an onion has 16 chromosomes in its leaf cell, how...

Practice · 1
  1. Ex Q6
    If an onion has 16 chromosomes in its leaf cell, how many chromosomes will be there in its root cell and pollen grain.

Q7. Identify the following phases of mitosis and label the...

Practice · 2
  1. Identify the following phases of mitosis and label the 'A' and 'B' given in diagrams
    Ex Q7(A)
    First diagram (spindle fibres labelled; a pointer marked 'A'): identify the phase of mitosis and label 'A'.
  2. Ex Q7(B)
    Second diagram (two pointers marked 'B'): identify the phase of mitosis and label 'B'.