During which of the times below is a plant at greatest risk for the formation of air bubbles in the xylem stream?

Question

Quizplus · Accepted Answer

During the afternoon, the temperature is highest and the air in the xylem can expand, forming air bubbles. This is especially a risk in plants that are located in areas with high solar radiation or heat, or when there is high transpiration demand from the leaves. Therefore, a plant is at the greatest risk for the formation of air bubbles in the xylem stream during the afternoon.

During Which of the Times Below Is a Plant at Greatest