Final answer:
The main feature of metaphase in a plant cell is the alignment of chromosomes along the equator or metaphase plate of the cell, facilitated by spindle fibers attached to the centromeres.
Step-by-step explanation:
Main Feature of Metaphase in a Plant Cell
During metaphase of both mitosis and meiosis II in a plant cell, the main feature is that the chromosomes align along the cell's equator, known as the metaphase plate. This crucial step involves spindle fibers attaching to the centromere of each sister chromatid, ensuring that when the cell divides, each daughter cell will receive an identical set of chromosomes. It is also important to note that the alignment of chromosomes along the cell's equator maximizes the efficiency of separation during the following stage, anaphase.