AP BIOLOGY

Detailed explanation-1: -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-2: -Xylem and phloem tissues are found in groups called vascular bundles . The position of these bundles varies in different parts of the plant. In a leaf, the phloem is usually found closer to the lower surface.

Detailed explanation-3: -organized into discrete strands or vascular bundles, each containing both xylem and phloem. The cells between the vascular bundles are thin-walled and often store starch.

Detailed explanation-4: -Hence, the correct answer is ‘Bicollateral’.

Detailed explanation-5: -Vascular plants (tracheophytes) differ from the nonvascular bryophytes in that they possess specialized supporting and water-conducting tissue, called xylem, and food-conducting tissue, called phloem.