The diagram below represents a plan cell Letter X represents a structure in the cell

The diagram below represents a plant cell Letter X represents the structure of the nucleus in the cell. Hence, option A is correct.
A nucleus, as related to genomics, is the membrane-enclosed organelle within a cell that contains the chromosomes.
The nucleus of a plant cell is in the cytoplasm with the centre of the cell often occupied by the vacuole.
A section through a cell may show the nucleus at the side, or it might appear in the centre of the cell if the section was of the "edge" of a cell.
Hence, option A is correct.
Learn more about the nucleus here:
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