(D) Polyembryony is the occurrence of more than one embryo in a seed. It is a common phenomenon in many species of the genus $Citrus$ (e.g.,lemon,oran

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(D) Polyembryony is the occurrence of more than one embryo in a seed. It is a common phenomenon in many species of the genus $Citrus$ (e.g.,lemon,orange) and $Mangifera$ (mango). In these plants,some of the nucellar cells surrounding the embryo sac start dividing,protrude into the embryo sac,and develop into embryos. Therefore,the correct option is $D$.