Question:
How many nuclei migrate from each pole to the centre of developing female gametophyte to form secondary nucleus?
How many nuclei migrate from each pole to the centre of developing female gametophyte to form secondary nucleus?
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Embryo sac rule: 8 nuclei → 2 polar nuclei (1 from each pole) → fuse to form secondary nucleus.
Updated On: May 4, 2026
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The Correct Option is A
Solution and Explanation
Concept:
During development of female gametophyte (embryo sac), nuclei undergo mitotic divisions forming 8 nuclei.
Step 1: Understand embryo sac formation.
• 8 nuclei are formed (4 at each pole)
• One nucleus from each pole migrates towards the centre
Step 2: Formation of secondary nucleus. The two polar nuclei (one from each pole) fuse in the centre to form the secondary nucleus. \[ 1 \text{ nucleus from each pole} \rightarrow \text{Secondary nucleus} \]
Step 3: Conclusion. \[ \text{Number of nuclei from each pole = One} \]
During development of female gametophyte (embryo sac), nuclei undergo mitotic divisions forming 8 nuclei.
Step 1: Understand embryo sac formation.
• 8 nuclei are formed (4 at each pole)
• One nucleus from each pole migrates towards the centre
Step 2: Formation of secondary nucleus. The two polar nuclei (one from each pole) fuse in the centre to form the secondary nucleus. \[ 1 \text{ nucleus from each pole} \rightarrow \text{Secondary nucleus} \]
Step 3: Conclusion. \[ \text{Number of nuclei from each pole = One} \]
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