The cluster of cells in the ovule of a fertilized flowering plant that has not yet formed into an embryo is called a proembryo.
<h3>What is a proembryo? </h3>
It is a structure that is developed after the egg is segmented and the formation of the true embryo is yet to take place.
After the egg and the sperm nuclei are fertilized, the apical and basal cells are formed after cell division. The cell division is asymmetrical in the case of monocot and transverse in the case of divots.
Apical cells turn into the proembryo and eventually the embryo. This development is supported by the suspensor cells from the basal cells.
Therefore, the cluster of cells in the ovule of a fertilized flowering plant that has not yet formed into an embryo is called a proembryo.
Read more about double fertilization in plants, here
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