AP BIOLOGY

Detailed explanation-1: -Water moves through the plant by means of capillary action. Capillary action occurs when the forces binding a liquid together (cohesion and surface tension) and the forces attracting that bound liquid to another surface (adhesion) are greater than the force of gravity.

Detailed explanation-2: -Water sticks to the celery molecules because of adhesion. Water molecules follow and stick to other water molecules because of cohesion. The process of moving liquids by adhesion and cohesion is called capillary action. The dark green liquid made it to the leaves and changed their color.

Detailed explanation-3: -Water is able to move up the xylem through a process called capillary action. Capillary action occurs when the forces of cohesion and adhesion combine in such a way that they overcome the downward force of gravity, and cause water to move upward through the thin tubes.

Detailed explanation-4: -Water then evaporates from the leaves, helping to draw up more water from the roots. This process is called capillary action. Celery is handy for demonstrating capillary action because it has a lot of xylem tubes in the stalk, making for fast water uptake.

Detailed explanation-5: -The tension created by transpiration “pulls” water in the plant xylem, drawing the water upward in much the same way that you draw water upward when you suck on a straw.