AP BIOLOGY

Detailed explanation-1: -Sieve tubes, which are columns of sieve tube cells having perforated sievelike areas in their lateral or end walls, provide the main channels in which food substances travel throughout a vascular plant.

Detailed explanation-2: -phloem: The part of a plant that carries sugars and other products of photosynthesis from where they are made in the leaves to where they are needed.

Detailed explanation-3: -The phloem carries food downward from the leaves to the roots. Xylem cells constitute the major part of a mature woody stem or root. They are stacked end to end in the center of the plant, forming a vertical column that conducts water and minerals absorbed by the roots upward through the stem to the leaves.

Detailed explanation-4: -Phloem moves sugar that the plant has produced by photosynthesis to where it is needed for processes such as: growing parts of the plant for immediate use. storage organs such as bulbs and tubers.

Detailed explanation-5: -Phloem is one of the two tissues that make up the plant’s long-distance transport system, the other being xylem. Phloem translocates water and products of photosynthesis from source tissues to the sink regions where they are utilized or stored.