In the following question, select the odd word from the given alternatives.

Herb, Tree, and Shrub are all types of plants, representing whole-plant growth forms. Herb refers to a soft-stemmed plant, Tree to a large woody plant with a single stem, and Shrub to a woody plant with multiple stems. Flower, on the other hand, is a reproductive structure and a part of a plant, not a whole-plant growth form.

• Types of plants: Herb (soft-stemmed plant), Tree (large woody plant), Shrub (multi-stemmed woody plant).

• Plant part: Flower (the reproductive structure of a plant).