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Q.

Consider the following statements and select the option that correctly fills the blank:
(I) The interphase nucleus has a loose and indistinct network of nucleoprotein fibres called _A_ 
(II) Primary constrictions of chromosomes are also called _B_.
(III) A part of chromosome beyond non- staining secondary constriction  is called _C_ 
(IV) Kinetochores are _D_ structure.

 ABCD
1.chromatinprimary constrictioncentromeredisc shaped
2.chromosomeskinetochoresprimary constrictionfibrillar
3.chromatincentromeresatellitedisc shaped
4.chromosomesprimary constrictionsatellitespindle shaped

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a

1

b

2

c

3

d

4

answer is C.

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Detailed Solution

The interphase nucleus has a loose and indistinct network of nucleoprotein fibres called chromatin.
Every chromosome essentially has a primary constriction or the centromere on the sides of which disc shaped structures called kinetochores are present. 
Few chromosomes have non-staining secondary constrictions at a constant location. This gives the appearance of a small fragment called the satellite.

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Consider the following statements and select the option that correctly fills the blank:(I) The interphase nucleus has a loose and indistinct network of nucleoprotein fibres called _A_ (II) Primary constrictions of chromosomes are also called _B_.(III) A part of chromosome beyond non- staining secondary constriction  is called _C_ (IV) Kinetochores are _D_ structure. ABCD1.chromatinprimary constrictioncentromeredisc shaped2.chromosomeskinetochoresprimary constrictionfibrillar3.chromatincentromeresatellitedisc shaped4.chromosomesprimary constrictionsatellitespindle shaped