1986
209
Sexual Reproduction in Flowering Plants
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Solution:
In free nuclear endosperm, the primary endosperm nucleus divides repeatedly without wall formation to produce a large number of free nuclei, e.g., maize, sunflower, Capsella, etc. In cellular endosperm every division of the primary endosperm nucleus is followed by cytokinesis. Therefore, endosperm becomes cellular from the very beginning, e.g., Balsam, Datura, Petunia. Helobial endosperm occurs in order Helobiales of monocots. The endosperm is of intermediate type between cellular and nuclear types e.g., Asphodelus.
