A cupboard is typically dark, has still air, and potentially higher humidity compared to other environments like under a fan or in the sun. These conditions (darkness, no air movement, high humidity)

Step 1: Analyze the effect of a cupboard environment on transpiration. A cupboard is typically dark, has still air, and potentially higher humidity compared to other environments like under a fan or in the sun. These conditions (darkness, no air movement, high humidity) significantly reduce the rate of transpiration (loss of water vapor from the plant). Step 2: Relate transpiration rate to the time taken to lose a specific volume of water. If the rate of transpiration is low, it will take a longer time for the plant to lose the same volume of water. Conversely, if the rate of transpiration is high, it will take a shorter time. Step 3: Compare the given time options. The question asks for the time likely obtained in a cupboard. Since the cupboard environment leads to the lowest transpiration rate, it should correspond to the longest time among the given options for losing the same volume of water. The options are: A. 15 secs B. 30 secs C. 25 secs D. 20 secs E. 28 secs Step 4: Identify the longest time. Comparing the options, 30 seconds is the longest time. This aligns with the expectation that a cupboard environment would result in the slowest rate of water loss, thus requiring the most time to lose a given volume. The final answer is B. 30 secs