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PEN stands for ?

Option: 1

Primary Endosperm Nucleus

Option: 2

Primary Epicotyl Nucleus

Option: 3

Primary Endosperm Nucleolus

Option: 4

Primary Epicotyl Nucleolus

Answers (1)


The syngamy is completed when one of the male gametes approaches the egg cell and unites with its nucleus. As a result, the zygote, a diploid cell, is created. A triploid primary endosperm nucleus (PEN) is created when the second male gamete merges with the two polar nuclei that are present in the central cell. Triple fusion is the term used for this process because three haploid nuclei are fused together.

Option 1 is the correct answer. 


Posted by

Pankaj Sanodiya

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