What is the main function of the spindle fiber during mitosis?
Answer: (C) To separate the chromosomes. Answer: To separate the chromosomes Solution: Spindle fibres attach to the kinetochores and, by their shortening, pull the daughter chromatids (now daughter chromosomes) toward opposite poles during anaphase, segregating the chromosomes into the two future daughter nuclei.
- A.To repair damaged DNA
- B.To regulate cell growth
- C.To separate the chromosomes✓
- D.To synthesize new DNA
Correct Answer
(C) To separate the chromosomes
Solution & Explanation
Answer: To separate the chromosomes Solution: Spindle fibres attach to the kinetochores and, by their shortening, pull the daughter chromatids (now daughter chromosomes) toward opposite poles during anaphase, segregating the chromosomes into the two future daughter nuclei. DNA repair and synthesis occur in interphase and are unrelated to spindle fibres, and regulating cell growth is not a spindle function; hence chromosome separation is correct. NCERT Reference: Ch 10, p.124, lines 5-7 — "Centromeres split and chromatids separate"