What is the ploidy level of endosperm in Oenothera? Share with your friends Share 1 Sonia Arul Baskaran answered this ALMOST ALL THE ENDOSPERM ARE SAID TO BE TRIPLOID. -7 View Full Answer Manpreet Singh answered this It is diploid(2n) because oenothera has 4 celled 4 nucleated embryo sac Triploid(3n) is in case of polygonum type of embryo sac which is 7 celled 8 nucleated. 13 Deexa Gautam answered this its exceptionally diploid (2n) 3