CBSE Questions for Class 11 Medical Biology Cell Cycle And Cell Division Quiz 16 - MCQExams.com

A cell divides every minute. It will fill a 100 ml beaker in one hour. How much time would it take to fill 50 ml beaker 
  • 30 minutes
  • 48 minutes
  • 50 minutes
  • 59 minutes
Best stage to observe shape, size and number of chromosomes is
  • Interphase
  • Metaphase
  • Prophase
  • Telophase
Which of these is connected with cell division? 
  • ER
  • Peroxisomes
  • Ribosomes
  • Microtubules
Shape of chromosome can be best observed during
  • Prophase
  • Metaphase
  • Anaphase
  • Telophase
 Nuclear spindle has .......... types of fibres 
  • One
  • Two
  • Three
  • Four
Identify the correct combination regarding anaphase, anaphase I and anaphase II.
  • Anaphase - centromere splits, Anaphase I - homologous chromosomes separate, Anaphase II - centromere splits
  • Anaphase - chromatids move to opposite poles, Anaphase I - homologous chromosomes separate, Anaphase II - centromere splits
  • Anaphase - chromosomes cluster at opposite poles, Anaphase homologous chromosomes separate, Anaphase II - centromere splits
  • Anaphase - chromosomes move to one pole, Anaphase I - homdlogous chromosomes separate, Anaphase II - centromere splits.
Genes do not occur in pairs in
  • Zygote
  • Somatic cell
  • Endosperm cells
  • Gametes
Syncytium formation takes place if
  • Cytokinesis is not followed by karyokinesis
  • Karyokinesis does not occur
  • Karyokinesis is not followed by cytokinesis
  • Both karyokinesis and cytokinesis are prevented
What are spindle fibers that connect the centromere to respective poles called?
  • Astral rays
  • Interphase fibers
  • Chromosomal fibers
  • Interchromosomal fibers
 Beads on string of A are seen in B which condense to form chromosomes in C stage of cell division.
  • A- Chromonema B- Chromatin C- Metaphase
  • A-Chromatin B- Metaphase C- Metaphase
  • A- Chromonema B- Chromosome C- Anaphase
  • A- Chromonema B- Chromatid C- Anaphase
Identify the stage of mitosis with its characteristics 

661096_458aa198e624401497f48a7d06f68117.PNG
  • Metaphase - chromosomes moved to spindle equator, chromosomes made up of two chromatids
  • Anaphase - Centromeres split, chromatids separate and start moving away
  • Late Prophase - chromosomes move to spindle equator
  • Metaphase - Spindle fibers attached to kinetochores, centromeres split and chromatids separate.
Which is not characteristic of telophase
Chromatin condenses to form chromosomes.
Nucleolus, Golgi complex and ER reform. 
Nuclear envelopes assemble around chromosome clusters. 
Centromeres split, and chromatids separate.
Chromosome clusters and their identity is lost.
  • 1, 2 and 4 
  • 1 and 4 
  • 2 and 3 
  • 3, 4 and 5 
U-proteins and R-proteins are needed in
  • Leptotene
  • Zygotene
  • Pachytene
  • Diplotene
Segregation of genes takes place during which phase of the meiosis?
  • Metaphase
  • Anaphase
  • Prophase
  • Embryo formation
Choose the incorrect match w.r.t mitosis.
  • Metaphase - Study of morphology of chromosome
  • Anaphase - Poleward movement of chromatids
  • Prophase - Shortest phase
  • Telophase - Final stage of mitotic karyokinesis
A diploid cell in human, where cell division does not occur:
(a) Heart cell
(b) Muscle cell
(c) Nerve cell
  • Only c
  • b and c
  • a and c
  • a, b and c
Which one of the following precedes reformation of nuclear envelope during M-phase of cell cycle?
  • decondensation of chromosomes and reassembly.
  • Transcription from chromosomes and reassembly of nuclear lamina.
  • formation of the contractile ring and formation of phragmoplast.
  • formation of the contractile ring and transcription from chromosomes.
Name the cell structure which is responsible for the sepration of chromosome.
  • Spindle fibres
  • Golgi aparatus
  • Satelite chromosome
  • Ribosomes
Starting with microspore mother cells, what is the least number of meiotic and mitotic divisions needed for the formation of $$500$$ male gametes in an angiosperm?
  • $$65$$ and $$500$$
  • $$63$$ and $$252$$
  • $$63$$ and $$500$$
  • $$63$$ and $$504$$
Haploid number of chromosomes are found in _____________.
  • Zygote
  • Amoeba
  • Queen honeybee
  • Ovum
Refer to the following statements describing Prophase I of meiosis and answer the question.
(i) Thin thread like chromosomes with a beaded appearance
(ii) Appearence of recombination nodules
(iii) Formation of bivalents/tetrads
(iv) Terminalisation of chiasmata
(v) Appearance of chiasmata
Arrange the given statements in the correct sequence of their occurrence during prophase I. 
  • (i), (iii), (ii), (v), (iv)
  • (i), (ii), (iii), (iv), (v)
  • (i), (iv), (v), (ii), (iii)
  • (i), (iii), (ii), (iv), (v)
In a butterfly has chromosomes number $$360$$ in its meiocyte $$(2n)$$. What will be the chromosome number in its gametes?
  • $$380$$
  • $$180$$
  • $$95$$
  • $$760$$
Match the following columns.
Column IColumn II
A.Phragmoplast1.Meiosis - II
B.Equational division2.Meiosis - I
C.Reductional division3.Zygotene - I
D.Synaptonemal complex4.Persistent spindle
  • $$A-4, B- 1, C- 2, D- 3$$
  • $$A-3, B- 1, C- 4, D- 2$$
  • $$A-3, B- 2, C- 4, D- 1$$
  • $$A-1, B- 3, C- 2, D- 4$$
Match the following columns.
Column - IColumn - II
A.Initiation of spindle fibres formation1.Anaphase - I
B.Synthesis of protein for replication2.Zygotene
C.Action of endonuclease3.S - phase
D.Movement of chromatids towards opposite poles
4.Pachytene


5.Anaphase
  • $$A- 2, B- 3, C- 4, D- 5$$
  • $$A- 3, B- 2, C- 1, D- 5$$
  • $$A- 1, B- 3, C- 5, D- 4$$
  • $$A- 5, B- 3, C- 1, D- 2$$
After incubation of two bacteria cultures for 132, minutes, the number of bacteria present is 20,What is the generation time?
  • 2 minutes
  • 5 minutes
  • 10 minutes
  • 30 minutes
Select the correct option:
What does (i) and (ii) represent in the given flowchart?

885473_ab5c638c358b4469b8ba806451192daa.png
  • (i) = 2n
    (ii) = n
  • (i) = n
    (ii) = n
  • (i) = n
    (ii) = 2n
  • (i) = 2n
    (ii) = 2n
Chromosomes arrange at equatorial plate of division spindle in
  • Prophase
  • Metaphase
  • Anaphase
  • Telophase
The paradox of meiosis is 
  • conservation of specific chromosome number from generation to generation
  • Produces four haploid cells after meiosis II
  • It is a double division
  • Does not involve DNA replication
What will be the amount of DNA in meiosis I products if a meiocyte contains 20 pg DNA in $$G_1$$ phase ?
  • 10 pg
  • 20 pg
  • 40 pg
  • 80 pg

Number of DNA molecules in a metaphase chromosome is            
  • Many
  • Three
  • One
  • Two
Find out the wrong statement.
  • Each metaphasic plate in heterotypic division of meiosis contains half the number of diploid set of chromosomes.
  • Interkinesis is generally short lived.
  • Synaptonemal complex and nuclear membrane completely disappear in diplotene.
  • Homologous chromosomes move to respective poles in anaphase -l
Which of the following statements are incorrect about meiosis ?
(a) It yields four genetically identical cells
(b) It involves two successive divisions without any DNA replication occurring between them.
(c) Intrameiotic interphase involves replication of DNA and centrioles.
(d) Meiosis -I results in the formation of two daughter cells each with haploids number of chromosomes and $$1C$$ DNA content 
  • (a),(b) and (c)
  • (a) and (b)
  • (a),(c) and (d)
  • (c) and (d)
Fill the blanks correctly.
Chromosomes duplicate during    A      and an increase in the number of chromosomes is observed first during      B     .
  • A - Interphase, B - Prophase
  • A - S-phase, B - Telophase
  • A - Synthetic phase, B - Gap 2 phase
  • A - Interphase. B - Anaphase
In the beginning of the meiosis,a meiocyte has 16pg of DNA. The amount in a gamete will be
  • 16 pg
  • 8pg
  • 4pg
  • 32pg
The number of tetrads present in pachytene and Metaphase-I of Allium cepa respectively
  • $$16$$ and $$8$$
  • $$16$$ and $$16$$
  • $$8$$ and $$8$$
  • $$16$$ and $$32$$
A cell has 10 picogram of DNA which undergone meiosis. What will be the amount of DNA in the product of meiosis I and meiosis II? 
  • 10 pg and 10 pg respectively
  • 10 pg and 5 pg respectively
  • 5 pg and 5 pg respectively
  • 5 pg and 10 pg respectively
In a cell cycle, crossing over occurs at:
  • Single strand stage
  • Two strand stage
  • Four strand stage
  • Eight strand stage
Leptotene chromosomes have?
  • Two chromatids
  • One chromatid
  • Four chromatid
  • No chromatid
Prophase-I is subdivided into five phases based on?
  • Chromosomal movement
  • Chromosomal alignment
  • Chromosomal behaviour
  • Chromosomal structure
Premitosis with spindle fibre is called as 
  • C-mitosis
  • Eumitosis
  • Polyteny
  • Karyochorisis
The structures that line up the chromosomes on the equatorial plate during metaphase are called?
  • Asters
  • Polar and kinetochore microtubules
  • Centrosomes
  • Centrioles
Which statement is not correct with respect to the diagram given below?
1472997_73e086a174514d2f9691534630263268.PNG
  • There are two chromatids in each chromosome at this stage
  • It may represent anaphase-II
  • Some chromatids have already undergone crossing over
  • All of the above.
Which stage of cell division provided visual evidence of mendel's law of independent assortement?
  • Mitotic anaphase
  • Meiotic anaphase-I
  • Mitotic Metaphase
  • Meiotic anaphase-II
All are essential stages that take places during meiosis, except  
  • 82 successive divisions without any DNA replication to occurring between them
  • Formation of chiasmata & Crossing over
  • Segregation of homologous chromosomes
  • No. of chromosomes in daughter cells after meiosis
Study the given diagram and select correct option.
1410112_00929d7877764bfaa89a5fbe9d7de855.PNG
  • Prophase - I
  • Metaphase - I
  • Metaphase
  • Transition to metaphase
The drawing given shows a cell whose diploid chromosome number is four. This cell is in?
1391021_4d0e15fc56b043919dfe0db2cd586e02.PNG
  • Metaphase of mitosis
  • Anaphase of mitosis
  • First anaphase of meiosis
  • Second anaphase of meiosis
In anaphase of the mitosis.
  • Nuclear membranes breaks down
  • Centromeres split, separating chromatids
  • Chromatids pulled towards pole
  • Nucleus divides into two
How many mitotic divisions occur in a cell of root to form 256 cells?
  • 128
  • 255
  • 10
  • All Wrong
At which of the given stages of mitosis, chromosomes appear in V, L, J and I shapes.
  • Anaphase
  • Metaphase
  • Prophase
  • Telophase
How do cells at the completion of meiosis compare with cells that have replicated their DNA and are just about to begin meiosis?
  • They have twice the amount of cytoplasm and half the amount of DNA.
  • They have half the number of chromosomes and half the amount DNA.
  • They have the half number of chromosomes and same amount of DNA.
  • They have half the number of chromosomes and one-fourth the amount of DNA.
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