. Botany for agricultural students . Botany. 466 SPERMATOPHYTES (SEED PLANTS) connection with double fertilization it should be noted that the endosperm nucleus contains the contents of three nuclei, since it is a product of a triple fusion, involving a sperm and the two polar nuclei. Embryo. — The first cells produced by the division of the fer- tilized egg form a filament which pushes down into the embryo sac. This filament is called the proembryo. The terminal cell of the proembryo develops the embryo, while the remainder of the filament remains as a stalk called suspensor. After the termi-

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. Botany for agricultural students . Botany. 466 SPERMATOPHYTES (SEED PLANTS) connection with double fertilization it should be noted that the endosperm nucleus contains the contents of three nuclei, since it is a product of a triple fusion, involving a sperm and the two polar nuclei. Embryo. — The first cells produced by the division of the fer- tilized egg form a filament which pushes down into the embryo sac. This filament is called the proembryo. The terminal cell of the proembryo develops the embryo, while the remainder of the filament remains as a stalk called suspensor. After the termi-

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Image ID: PG3RTT

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