Discussion
Assertion (A): Bacteria divide much more rapidly than eukaryotic cells.
Reason (R): Binary fission requires no spindle assembly and no nuclear envelope breakdown.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the cause. Binary fission needs no spindle, no nuclear envelope to dismantle and rebuild, and no condensation of chromosomes, so much of what occupies a eukaryotic cell for hours is simply absent. A bacterium can divide in twenty minutes against a typical eukaryotic cycle of a day, and it can even begin the next round of replication before the current division is complete.
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