AP BIOLOGY

Detailed explanation-1: -Xylem and Phloem are two different types of vascular tissues, which are mainly involved in the transportation process. These tissues form a vascular bundle and these work together as a unit. The movement of xylem is unidirectional, while the movement of phloem is bidirectional.

Detailed explanation-2: -A vascular bundle is a part of the transport system in vascular plants. The transport itself happens in the stem, which exists in two forms: xylem and phloem. Both these tissues are present in a vascular bundle, which in addition will include supporting and protective tissues.

Detailed explanation-3: -The vascular bundles comprise both xylem and phloem. The bundling of the vascular tissues ensures the connection between the remaining plant parts. This bundling ensures efficient transportation of substances.

Detailed explanation-4: -It is a component of the transport system in vascular plants. It comprises two tissues, i.e. phloem and xylem. Xylem comprises vessel elements, tracheids, xylem sclerenchyma, xylem parenchyma, and xylem fibers.

Detailed explanation-5: -Like the stem, the leaf contains vascular bundles composed of xylem and phloem (Figure 12.2.