Read the passage carefully and answer the questions based on the passage:

Passage: Pollen pistil interaction involves all events from the landing of pollen grains on the stigma until the pollen tube enters the embryo sac (when the pollen is compatible). When a pollen tube grows through the style and enters into the ovules, it finally discharges two male gametes in one of the synergids.

Syngamy and triple fusion are two fusion events that occur in angiosperms. Thus, angiosperms exhibit double fertilization. The products of these fusions are the diploid zygote and triploid primary endosperm nucleus. Zygote develops into embryo and primary endosperm cell forms the endosperm tissue. The developing embryo passes through different stages before maturation.

Which of the following is not a stage of growing embryo in dicotyledon plants?

The correct option is Epiblast.

Detailed Explanation:
Embryogeny (embryo development) in dicotyledonous plants follows a specific sequence of morphological stages as the zygote develops into a mature embryo:
1. Proembryo stage: The initial stage formed after the first few cell divisions of the zygote.
2. Globular stage: The stage where the cell mass divides to form a spherical structure.
3. Heart-shaped stage: The stage where localized cell division at the apex of the globular embryo gives rise to two cotyledons, resembling a heart shape.
4. Mature stage: The final stage before seed dormancy, containing fully formed cotyledons, a plumule, and a radicle.

In contrast, the epiblast is not a developmental stage. It is a structural feature—specifically, a small, leaf-like rudimentary structure representing a second cotyledon—found in the mature embryos of monocotyledonous plants (such as grasses). Therefore, it is not a stage of a growing embryo in dicotyledon plants.