Question

A researcher performed an experiment to determine the function of xylem and phloem. He removed the bark, including the phloem, in a complete ring around the tree. The xylem was left intact. After doing this, the researcher noticed a swelling just above the stripped ring; a sweet fluid leaked from this swollen area. The leaves of the tree remained green for several weeks. Eventually, however, they died; the entire tree died soon after. This experiment may lead you to formulate a question about water transport in plants. What causes the water to rise from the roots to the leaves against the forc

Answer 1

of gravity? The answer is that some other force, greater than the gravitational pull on the water, must pull the water upward. In the tallest sequoias, for example, water must rise about 107 m from roots to top leaves! Quite a pull is needed to get the water up to that height.
The answer lies in transpiration. Transpiration occurs as water evaporates from the stomata in the leaves. Scientists think that it is transpiration that provides the force that pulls the water upward against the force of gravity. As water at the stomata evaporates, the water in the leaf just below the stomata is drawn up to replace the vaporized water. Through this process, water slowly and continuously rises to the leaves.

Answer 2

What could be a hypothesis derived from the above observations?

Answer 3

@Octoknightx

Answer 4

Example: If water in the stomata evaporates, then water in the leaf just below the stomata will be drawn up to replace the vaporized water.

Hope that's good.