What type of cell is primarily found in complex tissues like xylem and phloem?

Complex tissues such as xylem and phloem are composed of at least two different types of cells working together to fulfill specific functions in plants. In the case of xylem, the primary cell types include tracheids and vessel elements, which are specialized for the transport of water and minerals. Phloem consists mainly of sieve tube elements and companion cells, which are responsible for the transport of sugars and nutrients. This combination of multiple cell types is essential for the efficient functioning of these vascular tissues, allowing plants to transport water, nutrients, and organic compounds throughout their structure.

Choosing the option that indicates the presence of at least two cell types accurately reflects the complexity and diversity of the cellular makeup of these important plant tissues. In contrast, parenchyma and collenchyma cells, while they do serve vital roles in plant structure and function, are typically classified as simple tissues and are not exclusive to the specialized roles found in vascular systems.