The first cell of the endosperm tissue is:

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(D) In angiosperms,the process of double fertilization involves the fusion of one male gamete with two polar nuclei to form the Primary Endosperm Nucl

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Primary Endosperm Cell $(PEC)$

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(D) In angiosperms,the process of double fertilization involves the fusion of one male gamete with two polar nuclei to form the Primary Endosperm Nucleus $(PEN)$. This fusion occurs within the central cell of the embryo sac. Following this,the central cell containing the $PEN$ is referred to as the Primary Endosperm Cell $(PEC)$. The $PEC$ undergoes repeated divisions to form the endosperm tissue,which provides nutrition to the developing embryo. Therefore,the Primary Endosperm Cell $(PEC)$ is the first cell of the endosperm tissue.

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