51.
The significance of Meiosis is that it
A
Produce four cells having chromosomal number equal to mother cell
B
Occurs in all types of cells
C
Maintains the constant Chromosomes number to a particular species
D
Growth of animal body organs
Answer :
Maintains the constant Chromosomes number to a particular species
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52.
Tetrad formation in meiosis occurs in
A
Leptotene
B
Zygotene
C
Pachytene
D
Diplotene
Answer :
Pachytene
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53.
Salivary gland chromosome were discovered by Balbiani (1881) from salivary glands of larva of
A
Chironomous
B
Drosophila
C
Silk worm
D
Lac worm
Answer :
Chironomous
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54.
Chromosome exhibit high level of coilling at which phase of karyokinesis
A
Prophase
B
Metaphase
C
Telophase
D
Interphase
Answer :
Metaphase
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55.
In cell cycle , changes of which stage are not visible under microscope
A
Interphase
B
Prophase
C
Metaphase
D
Anaphase
Answer :
Interphase
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56.
Which of the following options gives the correct sequence of events during mitosis?
A
Condensation → nuclear membrane disassembly → arrangement at equator → centromere division → segregation → telophase
B
Condensation → crossing over → nuclear membrane disassembly → segregation → telophase
C
Condensation → arrangement at equator → centromere division → segregation → telophase
D
Condensation → nuclear membrane disassembly → crossing over → segregation → telophase
Answer :
Condensation → nuclear membrane disassembly → arrangement at equator → centromere division → segregation → telophase
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57.
How much part of cycle formed by interphase
A
50%
B
70%
C
10%
D
90%
Answer :
90%
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58.
Cellular recognition is fasciliated by components of plasmamembrane. These components are generally
A
Protein molecules alone
B
Lipid molecules alone
C
Both lipid and protein molecules
D
Gylcolipids and glycoprotiens
Answer :
Gylcolipids and glycoprotiens
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59.
The diagammatic representation of chromosomes in known as
A
Idiogram
B
karyotype
C
Holotype
D
Nomotype
Answer :
Idiogram
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60.
The cromosome showing L-shaped structure by the presence of centromere is termed as
A
Acentric
B
Metacentric
C
Sub-metacentric
D
Telocentric
Answer :
Sub-metacentric
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