CBSE Questions for Class 11 Medical Biology Cell Cycle And Cell Division Quiz 1 - MCQExams.com

Dyad is a pair of 
  • sister chromatide
  • non-sister chromatids
  • homologous chromosomes
  • non-homologous chromosomes
Which of the following protein forms spindle fibres?
  • Tubulin
  • Myosin
  • Actomyosin
  • Myoglobin
The condensation of chromosomes takes place during 
  • Interphase
  • Prophase
  • Metaphase
  • Anaphase
  • Telophase
Which cell division is found during cleavage?
  • Amitosis
  • Mitosis
  • Closed mitosis
  • Meiosis
The best stage to count the number of chromosomes during mitosis is
 OR
Structure of chromosomes can be best seen at
  • Prophase
  • Metaphase
  • Anaphase
  • Telophase
The position of centromere during mitotic metaphase is
  • Towards the equator
  • Anywhere in the spindle
  • Variable from plant to plant
  • Towards the pole
The number of chromosomes after phase I of meiotic division:
  • Remain unchanged
  • Become doubled
  • Become halved
  • Exhibit polyploidy
Spindle fibres attach on to
  • Telomere of the chromosome
  • Kinetochore of the chromosome
  • Centromere of the chromosome
  • Kinetosome of the chromosome
A stage in cell division is shown in the figure. Select the answer which gives correct identification of the stage with its characteristics.
A. Telophase
Nuclear envelope reforms, Golgi complex reforms
B. Late anaphaseChromosome moves away from poles, Golgi complex not present
C. CytokinesisNuclear envelope disappears and mitochondria distributed between two daughter cells
D. ProphaseEndoplasmic reticulum and nucleolus is not reformed

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  • A-1
  • B-2
  • C-3 
  • D-4
Arrange the following events of meiosis in the correct sequence.
A. Crossing over
B. Synapsis
C. Terminalisation of chiasmata
D. Disappearance of nucleolus
  • B, C, D, A
  • B, A, D, C
  • B, A, C, D
  • A, B, C, D
Meiosis takes place in ............
  • Meiocyte
  • Conidia
  • Gemmule
  • Megaspore
Which of the following constituent protein are present in mitotic spindle?
  • Tubulin
  • Myosin
  • Tropomyocin
  • Dynein
Where can we study mitosis?
  • Legs
  • Brain
  • Nail base
  • Kidneys
Match the following with respect to meiosis
(a)Zygotene(i)Terminalization
(b)Pachytene(ii)Chiasmata
(c)Diplotene(iii)Crossing over
(d)Diakinesis(iv)Synapsis
Select the correct option from the following
  • (a) - (iv), (b) - (iii), (c) - (ii), (d) - (i)
  • (a) - (i), (b) - (ii), (c) - (iv), (d) - (iii)
  • (a) - (ii), (b) - (iv), (c) - (iii), (d) - (i)
  • (a) - (iii), (b) - (iv), (c) - (i), (d) - (ii)
At metaphase, chromosomes are attached to the spindle fibres by their
  • Satellites
  • Secondary constrictions
  • Kinetochores
  • Centromere
Primary source of allelic variation is
  • Independent assortment
  • Recombination
  • Mutation
  • Polyploidy
In which of the following stages, chromosomes are attached on equatorial plane?
  • Metaphase
  • Anaphase
  • Telophase
  • None of the above.
Crossing over is advantageous because it brings about
  • Variation
  • Linkage
  • Inbreeding
  • Stability
Diploid cells have
  • Two chromosomes
  • One set of chromosomes
  • Two pairs of chromosomes
  • Two sets of chromosomes
The process of mitosis is divided into 4 phases. Identify the correct order in which these phases appear in mitosis.
  • Anaphase $$\rightarrow$$ Metaphase $$\rightarrow$$ Telophase $$\rightarrow$$ Prophase
  • Telophase $$\rightarrow$$ Anaphase $$\rightarrow$$ Metaphase $$\rightarrow$$ Prophase
  • Metaphase $$\rightarrow$$ Prophase $$\rightarrow$$ Anaphase $$\rightarrow$$ Telophase
  • Prophase $$\rightarrow$$ Metaphase $$\rightarrow$$ Anaphase $$\rightarrow$$ Telophase
Chiasmata formation takes place during
  • Prophase I
  • Metaphase I
  • Anaphase II
  • Telophase I
Between mitosis, a cell is said to be in the
  • Resting stage
  • Sleeping stage
  • Active stage
  • None of the above
Meiosis is found in which of the following option?
  • Shoot apex
  • Reproductive part
  • Leaves bud
  • Vegetative parts
The process by which the chromosomes are separated in the sex cells and their number reduced from the diploid to haploid condition is known as
  • Division
  • Mitosis
  • Conjugation
  • Meiosis
The prophase of reduction division is divided into number of stages. The correct chronological sequence is
  • Leptotene - pachytene - zygotene - diplotene - diakinesis
  • Leptotene - diplotene - pachytene - zygotene - diakinesis
  • Leptotene - zygotene - diplotene - pachytene - diakinesis
  • Leptotene - zygotene - pachytene - diplotene - diakinesis
Which of the following characters is not related to telophase?
  • Formation of nuclear membrane
  • Formation of nucleolus
  • Increase in the number of chromosome
  • Formation of two daughter nuclei
During mitosis, chromosomes go to their poles in a stage called as
  • Prophase
  • Metaphase
  • Anaphase
  • Telophase
During the meiotic division, the
  • Homologous chromosomes are separated.
  • The linkage is disturbed.
  • The homologous chromosomes do not segregate.
  • All of the above.
Significance of mitosis is in
  • Occurrence in every tissue of body
  • Increasing cellular mass
  • Swift division
  • Producing cells genetically similar to parent cell
The complex formed by a pair of synapsed chromosomes is called as
  • Kinetochore
  • Bivalent
  • Axoneme
  • Equatorial plate
A selection that acts to eliminate one extreme from an aray of phenotypes is
  • Disruptive
  • Directional
  • Stabilizing
  • Coevolution
In meiosis I, a bivalent is an association of
  • Four chromatids and four centromeres.
  • Two chromatids and two centromeres.
  • Two chromatids and one centromere.
  • Two chromatids and four centromeres
  • Four chromatids and two centromeres.
Which one ensures maintainance of chromosome number from generation to generation?
  • Mitosis
  • Meiosis
  • Splicing
  • Metamorphosis
Which of the following occurs only in meiosis?
  • Pairing of homologous chromosomes.
  • Separation of duplicated strand.
  • Cytokinesis.
  • Disappearance of nucleolus.
The stage at which cytokinesis begins in plant cells is 
  • G$$_0$$ phase
  • Interphase
  • Anaphase
  • Telophase
The process by which the cytoplasm of a cell divides to form two daughter cells.
  • Cytokinesis
  • Prophase
  • Metaphase
  • Anaphase
  • Telophase
Meiosis is also known as
  • Mitosis
  • Mulitplicational division
  • Reductional division
  • Both A and C
The difference between mitosis and meiosis is that in meiosis
I. Two cell divisions take place.
II. DNA replicates during interphase.
III. Haploid cells are produced from diploid cells.
  • I only
  • II only
  • III only
  • I and III only
  • I, II, and III
The meiosis is involved in
  • Asexual reproduction
  • Sexual reproduction
  • Both
  • None of these
Meiosis is not observed in
  • Angiosperm
  • Somatic cells
  • Cycas
  • Fish
Division of the nucleus of the cell is called as 
  • Karyokinesis
  • Cytokinesis
  • Osmosis
  • Plasmolysis
Meiosis occurs in which of the following?
  • Diploid cells
  • Haploid cells
  • Mostly haploid cells but occasionally diploid cells
  • Mostly diploid cells but occasionally haploid cells
.................. is/are best suited for studying mitosis in classroom.
  • Anthers
  • Root tips
  • Pieces of bark
  • Shoot apex
The plant material suited for studying mitosis is 
  • Anther
  • Shoot apex
  • Root apex
  • Cork/leaf tip
During which of the following phases does cytokinesis take place?
  • Interphase
  • Prophase
  • Metaphase
  • Anaphase
  • Telophase
Mitotic stages are not observed in
  • Cosmarium
  • E. coli
  • Saccharomyces
  • Chlorella
The longest stage of meiosis is
  • Prophase I
  • Metaphase I
  • Anaphase I
  • Prophase II
  • Metaphase II
The term eumitosis is used for 
  • Mitosis is higher plants
  • Mitosis in animals
  • Mitosis where spindle is extranuclear
  • Mitosis with intranuclear spindle
Promitosis is 
  • Amitosis
  • $$G_1$$
  • $$G_2$$
  • Intranuclear mitosis
Chromosomes separating at the centromere and moving to opposite sides of the cell is an event that occurs during which phase of mitosis?
  • Interphase
  • Prophase
  • Metaphase
  • Anaphase
  • Telophase
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