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Cell Cycle and Cell Division Test - 66

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Cell Cycle and Cell Division Test - 66
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  • Question 1
    1 / -0
    During which phase can nucleolus be observed clearly?
    Solution
    The nucleolus can be observed clearly in the early prophase because in the end of prophase the chromatin material is condensed and becomes more compact thus making nucleolus disappear.
    So, the correct option is B.
  • Question 2
    1 / -0
     In meiosis-I at equator, which following is found? 
    Solution
    In meiosis 1, there are bivalents seen at the equator because crossing over of chromosomes takes place in meiosis which leads to the formation of bivalents.
    So, the correct answer is 'Bivalents'.
  • Question 3
    1 / -0
    Species-specific chromosome number is maintained generation after generation by 
    Solution
    Species-specific chromosome number is maintained generation after generation by meiosis. The meiosis is a kind of reductive division. When gametes are formed by meiosis, the number of chromosomes is halved. Hence each gamete will have only one pair of chromosome. Later the haploid gamete will fuse with the complementary haploid gamete and form a diploid zygote (2n). Hence the number of chromosomes are maintained.
    So, the correct answer is 'Meiosis'.
  • Question 4
    1 / -0
    Name the process where cytoplasmic material is divided into daughter cells.
    Solution
    Correct option: B

    Explanation:
    • Cell division is the process by which a parent cell divides into two or more daughter cells.
    • Cytokinesis is the part of the cell division process during which the cytoplasm of a single eukaryotic cell divides into two daughter cells.
    • Karyokinesis is the process by which nucleus of the parent cell divides into two daughter nuclei.
    • Therefore, the process where cytoplasmic material is divided into daughter cells is called Cytokinesis. Option B is correct.

  • Question 5
    1 / -0
    Given above is the representation of a certain event at a particular stage of a type of cell division. Which is the stage?

    Solution
    The given image represents crossing over. Crossing over is the process of exchange of genetic material or chromatid segments between two homologous chromosome. The crossing over takes place in the pachytene phase of prophase I during meiosis I division.
    So, the correct answer is option C.
  • Question 6
    1 / -0
    Mention the DNA content of the cell at the S-phase, prophase I, prophase II of a meiocyte.
    Solution
    Meiosis is the special type of cell division that occurs in two stages meiosis I called reductional division and meiosis II called equational division but in both of the process DNA contain is same as in reductional division it reduces to 2C and in meiosis II, it remains 2C because the only cell divides.
    In S or Synthesize phase before cell division cell prepares to make the DNA content double i.e. if the cell has 2C DNA it will become 4C.
    So the correct option is "4C,2C,2C"
  • Question 7
    1 / -0
    Choose the number of diploid structure in the list below
    Solution
    A normal human cell has 46  chromosomes which are said as 23 pairs.  46 chromosomes are haploid and 23 pairs are diploids that means each pair containing 2 chromosomes are diploid structure.
    So, the correct option is 'Two'.
  • Question 8
    1 / -0
    Fill the blanks correctly.
    Chromosomes duplicate during    A      and an increase in the number of chromosomes is observed first during      B     .
    Solution
    • During mitosis, a eukaryotic cell undergoes a carefully coordinated nuclear division that results in the formation of two genetically identical daughter cells.
    • Before the cells can enter the active phases of mitosis, however, it must go through a period known as interphase, during which it grows and produces the various proteins necessary for the division.
    • Prophase is the first phase of mitosis. During the phase, the chromosomes inside the cell's nucleus condense and become visible for the first time during the cell cycle.  But, the number of chromosomes can be observed clearly and distinguishably firstly during the anaphase.

    So the correct option is 'A -Interphase B- Anaphase'.
  • Question 9
    1 / -0
    Meiotic divison in plant and animals cell occur respectively in
    Solution

    Formation of four unidentical daughter cells from a parent cell is called Meiosis or reductional division. In plants, it occurs in diploid spore mother cells and in animal cells, it occurs in diploid germinal cells.

    So, the correct option is ‘diploid cell in both’.
  • Question 10
    1 / -0
    Which of the following statement is/are correct for the cell cycle?
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