AP BIOLOGY

Detailed explanation-1: -The cohesion-tension hypothesis is the most widely-accepted model for movement of water in vascular plants. Cohesion-tension essentially combines the process of capillary action with transpiration, or the evaporation of water from the plant stomata.

Detailed explanation-2: -The cohesion-tension theory explains how water moves up through the xylem. Inside the leaf at the cellular level, water on the surface of mesophyll cells saturates the cellulose microfibrils of the primary cell wall.

Detailed explanation-3: -According to the cohesion-tension theory, transpiration is the main driver of water movement in the xylem. It creates negative pressure (tension) equivalent to –2 MPa at the leaf surface. Water from the roots is ultimately pulled up by this tension.

Detailed explanation-4: -Cohesion-When two similar substances or molecules experience the force of attraction then this force is known as the cohesion force. Adhesion-When two dissimilar substances or molecules experience the force of attraction then this force is known as the adhesion force.

Detailed explanation-5: -Xylem plays a significant role in the transportation of water absorbed from the soil to different parts of the plant. Overall, xylem can be defined as the complex tissue present in plants, and it holds the responsibility of transporting water in the plants.