48. Which step is NOT the event can be observed in the double fertilization of angiosperm?
(A) 1 sperm fertilizes egg to become a diploid (2n) embryo
(B) The fertilized endosperm is triploid (3n)
(C) 2 sperm nuclei in the pollen grain
(D) an elongated pollen tube contains at least 2 nuclei

1. 題目解析這道題目考察的是雙重受精...