How the tapetal cells, which form the innermost wall layer of microsporongium, could become binucleate?

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By undergoing meiosis

Through polyteny

By endomitosis

Restitution nuclei formation

answer is C.

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Detailed Solution

By endomitosis, DNA replication and chromosome splitting takes place. The cell becomes bi-nucleate as there is no cytokinesis.
Polyteny increases the amount of DNA.
Restitution nuclei formation changes the ploidy level.
Meiosis is reduction division.

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