Explanation

Helobial. There are three types of endosperm development (i) Nuclear Type The primary endosperm nucleus divides repeatedly without wall formation to produce a large number of free nuclei. $e.g$., Maize, coconut and wheat (ii) Cellular Type Endosperm Every division of the primary endosperm nucleus is followed by cytokinesis $e.g.,$ Balsam, Datura, Petunia (iii) Helobial Endosperm The first division of primary endosperm nucleus is followed by transverse cytokinesis to form two cells. Further development in both the cells occurs like that of nuclear endosperm