321.
Rate of cell division increases by application of
A
Cytokinins
B
Auxins
C
Gibberrellins
D
Colchicine
Answer :
Cytokinins
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322.
Duplicaton of chromosomes without the division of nucleus is called
A
Cytokinesis
B
Plasmotomy
C
Endomitosis
D
Dino -mitosis
Answer :
Endomitosis
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323.
During cell division in apical meristem the nuclear membrane appears in
A
metaphase
B
Anaphase
C
telophase
D
cytokinesis
Answer :
telophase
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324.
Coilling of chromonema in prophase of mitosis is
A
Plectonemic
B
Paranemic
C
Helical
D
Irregular
Answer :
Plectonemic
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325.
In meiosis-I the inter zonal fibers appear in which stage
A
Prophase - I
B
Metaphase - I
C
Anaphase - I
D
Telophase - I
Answer :
Metaphase - I
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326.
Syntehsis and storage of ATP molecules required for cell division takes place in
A
Prophase
B
G1 - phase
C
Anaphase
D
G2-pahse
Answer :
G2-pahse
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327.
L-shaped chromosomes are called
A
Sex-chromosome
B
Acrocentric
C
Telocentri
D
Sub metacenric
Answer :
Sub metacenric
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328.
Spindile microtubules composed of
A
Actin filament
B
95% dyinen and 5% DNA
C
95-97% tubulin and 3-5 % RNA
D
Collagen and elastin protein
Answer :
95-97% tubulin and 3-5 % RNA
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329.
Number of chromatids at metaphase is
A
two each in mitosis and meiosis
B
two in mitosis and one in meiosis
C
two in mitosis and four in meiosis
D
one in mitosis and two in meiosis
Answer :
two each in mitosis and meiosis
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330.
Crossing over takes place between which chromatids and in which stage of the cell cycle?
A
Non-sister chromatids of non-homologous chrom-osomes at Pachytene stage of prophase I
B
Non-sister chromatids of non-homologous chrom-osomes at Zygotene stage of prophase I
C
Non-sister chromatids of homologous chromosomes at Pachytene stage of prophase I
D
Non-sister chromatids of homologous chromosomes at Zygotene stage of prophase I
Answer :
Non-sister chromatids of homologous chromosomes at Pachytene stage of prophase I
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