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Quiz 3
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Q.1
Phase of shortest duration is ... ....
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a) Prophase
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b) Metaphase
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c) Anaphase
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d) S -phase
Explanation
Answer : (c)
Q.2
Significance of mitosis is in .... ... [ Har PMT 1993 ]
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a) Increasing cellular mass
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b) Swift division
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c) Occurrence in every tissue of body
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d) Producing cells generically similar to parent cell
Explanation
Answer : (d)
Q.3
The stage in which chiasmata can be seen is ... .. [ HPPMT 2007 ]
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a) Leptotene
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b) Zygotene
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c) Pachytene
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d) diplotene
Explanation
The chiasmata become visible during the diplotene stage of prophase I of meiosis, but the actual "crossing-overs" of genetic material are thought to occur during the previous pachytene stage Answer : (d)
Q.4
Pachytene belongs to ... ... { AMU 1998 ]
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a) Mitosis
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b) Meiosis
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c) Growth of cell
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d) Development of endosperm
Explanation
Answer : (b)
Q.5
Mitosis takes place in ... ...
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a) All types of cells except those involved in gamete formation
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b) Gonads
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c) Axillary buds situated near the apical bud
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d) Cells of mature leaf
Explanation
Answer : (a)
Q.6
During metaphase I, the centromeres ... ... [ AMU 1998 ]
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a) Undergo division
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b) Do not divide
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c) Divide but do not separate
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d) Are not identical
Explanation
Answer : (b)
Q.7
DNA synthesis occurs during ... ... [ DPMT 2001 ]
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a) Interphase
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b) Prophase
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c) Metaphase
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d) Anaphase
Explanation
Answer : (a)
Q.8
Disjunction is ... ....
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a) Chromosome separation during mitosis
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b) Chromosome separation during prophase I
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c) Chromosome separation in anaphase I
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d) Chromosome separation during metaphase I
Explanation
Answer : (c)
Q.9
Select the correct matches A) S-phase - DNA replication B) Zygotene - Synapsis C) Diplotene - Crossing over D) Meiosis - Both haploid and diploid cells E) Gap 2 phase - Quiescent stage... .... [ kerala 2011 ]
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a) A and B
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b) C and D
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c) C and E
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d) A, C and E
Explanation
Answer : (a)
Q.10
Phragmoplast is precursor of ... .. [ JIPMER 2002 ]
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a) Leucoplast
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b) Chloroplast
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c) Chromoplast
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d) Cell plate
Explanation
Answer : (d)
Q.11
What occurs in germinal cells during gamete formation ... ... [ kerala 2000 ]
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a) One reduction division and one equational division
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b) Two successive equational divisions
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c) Two successive reduction division
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d) Short prophase in division I
Explanation
Answer : (a)
Q.12
In telophase of mitosis ... ... [ RPMT 1998 ]
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a) Chromosomes get arranged in middle of cell
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b) Chromosome fibers become clear
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c) Chromosomes aggregate at opposite poles to form daughter nuclei
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d) Nuclear envelop disappears
Explanation
Answer : (c)
Q.13
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 .... ... [ Kerala 2004 ]
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a) 30 minutes
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b) 48 minutes
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c) 50 minutes
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d) 59 minutes
Explanation
Since one cell produce two cells in one minute Or volume gets doubled of initial volume in one minute There fore if at 59 min volume is 50 ml Then in next minute it will produce 100 ml Or 60 min = 100 ml Answer : (d)
Q.14
recombination involves .. ... [ DPMT 2009 ]
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a) Cross over
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b) Chromosome duplication
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c) Spindle formation
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d) Cytokinesis
Explanation
Answer : (a)
Q.15
During cell cycle, two molecules of DNA are present in chromosome during ... ... [ AIIMS 2001 ]
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a) G1 phase
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b) Beginning of S-phase
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c) G2 phase
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d) End of M-phase
Explanation
Answer : (c)
Q.16
Reorganisation of genetic material or genetic recombination occurs during ... ... [ Odisha 2007 ]
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a) Metamorphosis
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b) Organogenesis
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c) Mitosis
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d) Meiosis
Explanation
Answer : (d)
Q.17
Spindle fibers are attached to chromosomes in the region of ... ... [ Bih PMT 2011 ]
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a) Centrosome
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b) Chromosmere
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c) Chromonema
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d) Kinetochore
Explanation
Answer : (d)
Q.18
Zygotic meiosis occurs in .... ... [ AFMC 1994 ]
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a) Pinus
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b) Marchantia
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c) Chlamydomonas
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d) Dryopteris
Explanation
Answer : (c)
Q.19
Synapsis occurs between ... ... [ CBSE 2009 ]
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a) Spindle fibers and centromeres
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b) mRNA and ribosomes
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c) A male and female gamete
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d) Two homologous chromosomes
Explanation
Answer : (d)
Q.20
DNA duplication occurs during ... ... [ AMU 2003 ]
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a) Early prophase
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b) Late prophase
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c) Telophase
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d) None of the above
Explanation
Answer : (d)
Q.21
In which stage synaptinemal complex dissolved, chromatids become clear and bivalents are called tetrads ... ... [ CET Chd 2006 ] Explanation is provided, please clcik on
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a) Zygotene
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b) Pachytene
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c) Diplotene
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d) Diakinesis
Explanation
Prophase I is subdivided into five phases, viz. Leptotene, Zygotene, Pachytene, Diplotene and Diakinesis The dissolution of synaptonemal complex occur at deplotene phase of pro-phase 1 in meiosis Pachytene Bivalent chromosomes clearly appear as tetrads. Recombination nodules appear. These nodules are the sites at which crossing over takes place between non-sister chromatids of the homologous chromosomes. Exchange of genetic materials between two homologous chromosomes takes place during crossing over. This leads to recombination of genetic materials on the two chromosomes Answer : (c)
Q.22
Chromosomes separate during ... .. [ DPMT 2003 ]
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a) Early prophase
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b) Early metaphase
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c) Early anaphase
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d) Early telophase
Explanation
Answer : (c)
Q.23
Centromere is required for ... ... [ CBSE 2005 ]
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a) Crossing over
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b) Transcription
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c) Cytoplasmic cleavage
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d) Movement of chromosomes towards poles
Explanation
Answer : (d)
Q.24
Best stage to observe shape, size and number of chromosomes is ... ... [ JKCMEE 1999]
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a) Interphase
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b) Metaphase
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c) Prophase
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d) Telophase
Explanation
Answer : (b)
Q.25
Genetic recombination occurs during ... ... [ Odisha 2003 ]
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a) Zygotene
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b) Diplotene
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c) Pachytene
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d) Metaphase - I
Explanation
Answer : (c)
Q.26
G1, S and G2 are stages of ... ... [ AFMC 2009 ]
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a) Interphase
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b) Prophase
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c) Metaphase
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d) Anaphase
Explanation
Answer : (a)
Q.27
Meiosis occurs in Tomato in ... ... [ har. PMT 1994 ]
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a) Pollen sac and ovule
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b) Microspore and megaspore mother cells
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c) Both A and B
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d) Zygote
Explanation
Answer : (c)
Q.28
Choose the correctly matched pairs and correct option A) Leptotene - Chromosomes become invisible B) Zygotene - Pairing of homologous chromosomes C) Pachytene - Dissolution of synaptonemal complex takes place D) Diplotene - Bivalent chromosomes appears as tetrads E) Terminalisation of chiasmata takes place ... ... [ kerala 2012 ]
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a) A and B correct
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b) B and D correct
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c) B and E correct
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d) B and C correct
Explanation
Answer : (c)
Q.29
Arrange the following events of meiosis in correct sequence? 1) Terminalisation 2) Crossing over 3) Synapsis 4) Disjunction
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a) 4, 3, 2, 1
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b) 3, 2, 1, 4
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c) 2, 1, 4, 3
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d) 1, 4, 3, 2
Explanation
Answer : (b)
Q.30
Meiosis was discovered by ... ... [ Bih PMT 1994 ]
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a) Walther Flemming
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b) Hofmeister
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c) Oscar Hertwig
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d) Amici
Explanation
Meiosis was discovered by German biologist Oscar Hertwig while German physician Walther Flemming is credited with the discovery of mitosis Answer : (c)
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