FBISE, NCP & NBF-aligned resources for Classes 9–12
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Biology Chapter 5 : Topic 1
Cell Cycle
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A cell has just completed division and starts growing while performing its normal functions. Which stage of the cell cycle is it most likely in?
Reasoning: Interphase is the longest stage of the cell cycle during which the cell grows, performs normal metabolic activities, and prepares for division.
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Which event indicates that a cell is preparing for future cell division rather than carrying out its routine activities?
Reasoning: DNA replication occurs during interphase as preparation for cell division, ensuring each daughter cell receives genetic material.
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The main purpose of the cell cycle is to:
Reasoning: The cell cycle enables growth, repair, replacement, and reproduction by producing new cells.
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If DNA fails to replicate before cell division, the most likely consequence would be:
Reasoning: DNA replication ensures equal genetic material is passed to daughter cells. Without replication, genetic information would be incomplete.
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Which sequence correctly represents the major stages of the cell cycle?
Reasoning: Cells first undergo interphase, then mitosis (nuclear division), followed by cytokinesis (cytoplasmic division).
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During which part of the cell cycle does the chromosome number remain constant while DNA amount doubles?
Reasoning: DNA replicates during interphase, doubling DNA content without changing chromosome number.
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A tissue injury heals because nearby cells repeatedly undergo:
Reasoning: New cells produced through the cell cycle replace damaged cells and repair tissues.
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Which process directly follows mitosis in the cell cycle?
Reasoning: After nuclear division (mitosis), the cytoplasm divides through cytokinesis.
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Why is interphase often called the "preparatory stage" of the cell cycle?
Reasoning: Interphase involves growth, synthesis of proteins, and DNA replication needed for division.
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A scientist observes a cell with duplicated DNA but an intact nucleus. The cell is most likely in:
Reasoning: DNA replication occurs during interphase while the nuclear membrane remains intact.
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Which statement best explains why the cell cycle is essential for multicellular organisms?
Reasoning: Growth and repair in multicellular organisms depend on continuous production of new cells.
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Which stage occupies the greatest portion of a cell's life?
Reasoning: Interphase is the longest stage, where cells spend most of their lifespan.
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What would happen if cytokinesis occurred without mitosis?
Reasoning: Without mitosis, the nucleus would not divide properly before the cytoplasm splits.
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Which event occurs only once during a complete cell cycle?
Reasoning: DNA replication occurs once before each cell division cycle.
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A rapidly growing child requires frequent cell divisions. Which phase would be especially important before each division?
Reasoning: Interphase prepares the cell through growth and DNA duplication before division.
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A dividing cell has no visible nuclear envelope, spindle fibres have attached to condensed chromosomes, and the chromosomes are moving toward—but are not yet fully aligned at—the equator. Which phase is shown?
Reasoning: The nuclear envelope has disappeared, spindle fibers have attached to the chromosomes, and the chromosomes are moving toward the cell's equator but are not yet fully aligned.
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