Botany : Cell Cycle - Important Question Paper

11th Standard

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Biology

Time : 01:00:00 Hrs
Total Marks : 50

    Part A

    Multiple Choice Questions

    10 x 1 = 10
  1. The correct sequence in cell cycle is

    (a)

    S-M-G1-G2

    (b)

    S-G1-G2-M

    (c)

    G1-S-G2-M

    (d)

    M-G-G2-S

  2. If mitotic division is restricted in G1 phase of the cell cycle then the condition is known as

    (a)

    S Phase

    (b)

    G2 Phase

    (c)

    M Phase

    (d)

    Go Phase

  3. Anaphase promoting complex APC is a protein degradation machinery necessary for proper mitosis of animal cells. If APC is defective in human cell, which of the following is expected to occur?

    (a)

    Chromosomes will be fragmented

    (b)

    Chromosomes will not condense

    (c)

    Chromosomes will not segregate

    (d)

    Recombination of Chromosomes will occur

  4. In S phase of the cell cycle

    (a)

    Amount of DNA doubles in each cell

    (b)

    Amount of DNA remains same in each cell

    (c)

    Chromosome number is increased

    (d)

    Amount of DNA is reduced to half in each cell

  5. Centromere is required for

    (a)

    transcription

    (b)

    crossing over

    (c)

    cytoplasmic cleavage

    (d)

    movement of Chromosome towards pole

  6. Synapsis occur between

    (a)

    mRNA and ribosomes

    (b)

    spindle fibres and centromeres

    (c)

    two homologous Chromosomes

    (d)

    a male and a female gamete

  7. In meiosis crossing over is initiated at

    (a)

    Diplotene

    (b)

    Pachytene

    (c)

    Leptotene

    (d)

    Zygotene

  8. Colchicine prevents the mitosis of the cells at which of the following stage

    (a)

    Anaphase

    (b)

    Metaphase

    (c)

    Prophase

    (d)

    interphase

  9. The paring of homologous Chromosomes on meiosis is known as

    (a)

    Bivalent

    (b)

    Synapsis

    (c)

    Disjunction

    (d)

    Synergids

  10. Anastral mitosis is the characteristic feature of

    (a)

    Lower animals

    (b)

    Higher animals

    (c)

    Higher plants

    (d)

    All living organisms

  11. Part B

    Answer  all the Two Mark Questions

    6 x 2 = 12
  12. Write any three significance of mitosis.

  13. Imagine a situation if there was no meiosis. Then what would have happened to the next generation?

  14. Define the term haploid.

  15. Define the term Cytokinesis

  16. Define maturation promoting factor (MPF)

  17. What is the Role of the Nucleus?

  18. Part C

    Answer  all the Three Mark Questions

    6 x 3 = 18
  19. What do you understand by interphase?

  20. Differentiate between S-phase and G2-phase

  21. What are chiasmata? State their significance.

  22. What is Mitogen?

  23. What is Endomitosis?

  24. What is Maturation Promoting Factor?

  25. Part D

    Answer  all the Five  Mark Questions

    2 x 5 = 10
  26. Differentiate cytokinesis in plant cells and animal cells.

  27. Explain the events take place at metaphase and anaphase stages of somatic cell division with diagram.

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