Which of the following are classified as woody plants?

Study for the Iowa Right-of-Way Herbicide Category 6 Exam. Discover flashcards and multiple choice questions, each accompanied by helpful hints and explanations. Prepare effectively for your certification!

Woody plants are characterized by a hard, woody stem that persists over multiple growing seasons. This definition encompasses a variety of plants that can grow into significant sizes and often have a branching structure. Buckthorn and multiflora rose fall under this classification as they have the features typical of woody plants: a durable stem and the ability to grow substantial heights, often forming thickets.

In contrast, the other options include plants that are generally classified as herbaceous or non-woody. Cocklebur and teasel, for example, are typically annual or biennial plants, characterized by softer, green stems that die back at the end of the growing season. Similarly, puncture vine and tall thistle do not develop the woody structure required to be classified as trees or shrubs. Wild carrot and bluebell also do not possess the characteristics of woody plants, as they have softer and easily pliable stems. This illustrates why the answer highlighting buckthorn and multiflora rose as woody plants is distinctly correct in this classification context.

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