Certified Professional Horticulturist (CPH) Practice Exam

What is the name of the layer of tissues located between the xylem and the phloem?

1. Cell wall

2. Mucus Membrane

3. Cambium

4. Stamen

The correct answer is: Cambium

The layer of tissues located between the xylem and the phloem is known as the cambium. This is a vital layer of meristematic tissue in vascular plants that enables secondary growth. The cambium is responsible for producing new xylem and phloem cells, allowing the plant to increase in girth as it ages. In stems and roots, the cambium facilitates the development of vascular tissues, which are crucial for nutrient and water transport throughout the plant. The other options do not pertain to the specific tissue layer between xylem and phloem. The cell wall is a protective outer layer of plant cells, the mucus membrane is relevant to animal biology, and the stamen is part of the flower structure involved in reproduction. These options highlight the diverse functions and structures present in plants and animals, further underscoring the significance of the cambium in vascular plant structure and growth.