During stage 1, what are the relationships of sugar levels, water flow, and the tissue providing water?

• A. low; high; xylem.
• B. high; low; phloem.
• C. moderate; moderate; cambium.
• D. none; none; mesophyll.

Answer: (D)

The key idea here is identifying what is happening at stage 1 with regard to sugar, water movement, and which tissue is described as supplying water. In stage 1, there is no described sugar transport into the tissue, and there is no described active water flow involved. The tissue referred to as providing water is the mesophyll, the leaf tissue where hydration status is managed and from which water is readily available to the photosynthetic cells. So the statement that stage 1 has none for sugar levels, none for water flow, and mesophyll as the water-providing tissue fits the described scenario.