Why did the plants exposed to no light look less healthy than those exposed to light? The sickly pale color seen in plants 4, 5, and 6 is most likely attributed to the fact that, without sunlight, plants are not able to create sugars to nourish itself. Sugar is vital for the healthy …show more content…
The three main theories as to how xylem transports water and minerals are root pressure, capillary action, and cohesion-tension/transport pull. The root pressure theory works by the water being pumped into xylem tissue. Then, the minerals and ions absorbed with the water then get pumped up the root. The water then follows the ions and minerals up the xylem, and throughout the plant. Capillary action works by relying on the adhesive properties of water. Because the polarity of the capillary walls attracts water molecules, water sticks to the sides of the tube, therefore, causing the water to move up the tube. Cohesion-tension or transpiration pull works by the water from the leaves being evaporated caused by the heat of the sun. This then causes a change in pressure which moves the water up from the