AP BIOLOGY

Detailed explanation-1: -The stem supports the plant above ground, and carries the water and minerals to the leaves.

Detailed explanation-2: -Stems carry water and nutrients taken up by the roots to the leaves. Then the food produced by the leaves moves to other parts of the plant. The cells that do this work are called the xylem cells. They move water.

Detailed explanation-3: -Stems possess specialized tissues called vascular bundles that conduct food and water to all parts of the plant. Xylem and phloem are conducting tissues that together form the vascular bundles. Phloem carries food from the leaf to the different parts of the plant.

Detailed explanation-4: -Vascular bundles consist of phloem tissue, xylem tissue, and a layer called the cambium between them. Each vascular bundle is supported by a tough section of parenchyma and sclerenchyma tissue called the pericycle. Pith is the spongy storage tissue in the center of stems, also made up of parenchyma cells.

Detailed explanation-5: -The structure of plant roots, stems, and leaves facilitates the transport of water, nutrients, and photosynthates throughout the plant. The phloem and xylem are the main tissues responsible for this movement.