If the cells of a plant did not have cell walls, the most likely outcome would be:
A) The plant would be unable to maintain its structure and integrity, leading to collapse and inability to grow upright.
Without cell walls, plant cells would lose their rigidity and shape, making it difficult for the plant to stand upright and properly transport nutrients and water. Additionally, the lack of a cell wall would make the plant more vulnerable to environmental stresses and pathogens.