Explain the role of cohesion and tension in the process of transpiration pull.

In an investigation, a student cut a sunflower stem underwater before transferring the cut end into a beaker containing a blue dye solution. Suggest why it is vital to cut the stem underwater.

Suggest how the student could use microscopy to determine whether the blue dye had traveled specifically through the xylem vessels.

A coastal farm was flooded with seawater, making the solute concentration of the soil water much higher than normal. Explain why the crops began to wilt rapidly, even though the soil was completely saturated with water.

A researcher suggested that treating the roots of healthy crops with an inhibitor of aerobic respiration (such as cyanide) would eventually cause a similar wilting effect. Explain whether this suggestion is correct.

Explain why plants exposed to high light intensity require more water than identical plants kept in shaded conditions, even when the ambient temperature and humidity are controlled to be identical.