AP BIOLOGY

Detailed explanation-1: -Water and solutes are transported by the xylem from the roots to the leaves, and food is transported from the leaves to the rest of the plant by the phloem.

Detailed explanation-2: -The xylem is a tissue which transports water and minerals from the roots up the plant stem and into the leaves.

Detailed explanation-3: -The cohesion – tension theory of sap ascent explains how how water is pulled up from the roots to the top of the plant. Evaporation from mesophyll cells in the leaves produces a negative water potential gradient that causes water and minerals to move upwards from the roots through the xylem.

Detailed explanation-4: -Cohesion-tension essentially combines the process of capillary action with transpiration, or the evaporation of water from the plant stomata. Transpiration is ultimately the main driver of water movement in xylem.

Detailed explanation-5: -Complete answer: 1. Xylem tracheids-These are dead tubes like hollow cells. They have thick lignified walls and functions in transport of water and minerals.