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Question 
What is meant by PEN ?
 Question Submitted By :: BioMaster
I also faced this Question!!     Rank Answer Posted By  
 
  Re: What is meant by PEN ?
Answer
# 1		 
PEN means primary endosperm nucleus.this is formed during 
triple fusion and double fertilisation process.second male 
gamete fuses with two polar nuclei and forms the primary 
endosperm nucleus which is triploid in condition.
 
Is This Answer Correct ?    0 Yes 0 No
Abhilash
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