Which activity would best illustrate how plants absorb water, as shown by a colored solution moving through a plant's stem?

Which activity would best illustrate how plants absorb water, as shown by a colored solution moving through a plant's stem?

• A. The dyed water rising in a carnation stem demonstrates plant water absorption
• B. Watching a plant grow taller in sunlight
• C. Measuring leaf area with a ruler
• D. Cooling a plant to slow transpiration

Answer: (A)

Water moves through a plant mainly via the xylem, rising from roots up toward the leaves as water is lost from the leaves (transpiration). The dyed water rising in a carnation stem gives a clear visual of this process: the colored solution travels from the cut base up through the stem, showing water uptake and internal transport through the plant’s vascular system. This directly illustrates how water is absorbed and moves to the different tissues, which is exactly what's being demonstrated. Other options don’t show this movement: growth in sunlight shows overall growth, measuring leaf area assesses size, and cooling slows transpiration without illustrating the transport pathway itself.

Water moves through a plant mainly via the xylem, rising from roots up toward the leaves as water is lost from the leaves (transpiration). The dyed water rising in a carnation stem gives a clear visual of this process: the colored solution travels from the cut base up through the stem, showing water uptake and internal transport through the plant’s vascular system. This directly illustrates how water is absorbed and moves to the different tissues, which is exactly what's being demonstrated. Other options don’t show this movement: growth in sunlight shows overall growth, measuring leaf area assesses size, and cooling slows transpiration without illustrating the transport pathway itself.