Answer:
In angiosperms, the endospermis a special tissue which is formed as a result of triple fusion or fusion of a male gamete with diploid secondary nucleus of the central cell. \[\underset{(n)}{\mathop{Male\text{ }gamete}}\,\text{ }+\text{ }\underset{(2n)}{\mathop{Secondary\text{ }nucleus~}}\,\to \underset{3n}{\mathop{Endosperm}}\,\] Hence, endospermin angiosperms is a triploid structure.
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