Spindle fibres attach on to:
Answer: (B) Kinetochore of the chromosome. Answer: (B) Kinetochore of the chromosome Solution: Every chromosome has a primary constriction (centromere) on whose sides lie disc-shaped structures called kinetochores.
- A.Telomere of the chromosome
- B.Kinetochore of the chromosome✓
- C.Centromere of the chromosome
- D.Kinetosome of the chromosome
Correct Answer
(B) Kinetochore of the chromosome
Solution & Explanation
Answer: (B) Kinetochore of the chromosome Solution: Every chromosome has a primary constriction (centromere) on whose sides lie disc-shaped structures called kinetochores. The spindle fibres (microtubules from the spindle apparatus) attach to these kinetochores, not directly to the centromere body, which is why kinetochore is the precise answer. Option 3 (centromere) is a common distractor, but NCERT specifies the kinetochore as the disc-shaped attachment plate. NCERT Reference: Ch 8, p.101, lines 17-20: "Every chromosome (visible only in dividing cells) essentially has a primary constriction or the centromere on the sides of which disc shaped structures called kinetochores are present"