Final answer:
The correct answer is options a. root pressure exceeds transpiration pull and d. roots are not absorbing minerals from the soil.
Step-by-step explanation:
Guttation is the process by which plants release excess water in the form of droplets from specialized structures called hydathodes. It typically occurs under conditions of high humidity and root pressure exceeding transpiration pull. When root pressure is high, water is forced into the xylem vessels and can be pushed up to the leaves, where it accumulates and is eventually released through the hydathodes.
Transpiration rates being high are not likely to cause guttation, as transpiration involves the loss of water vapor from the leaves through stomata, rather than the release of liquid water.
The preceding evening being hot, windy, and dry can also contribute to guttation, as it leads to water loss through transpiration and an increase in root pressure. The combination of reduced water uptake by the roots and increased transpiration can result in the accumulation of water in the leaves, leading to guttation.