Which of the following may indicate potassium deficiency?

Potassium deficiency is characterized by specific symptoms that reflect the nutrient's crucial role in plant health, particularly concerning water regulation, enzyme activation, and photosynthesis. The correct choice indicates that one of the primary signs of potassium deficiency is the appearance of scorched leaves and shriveled fruit.

The scorching of leaves typically manifests as marginal leaf burn or browning, which occurs due to impaired water regulation, since potassium helps control the opening and closing of stomata. This loss of water regulation can lead to a decrease in the plant's ability to maintain turgor pressure, further exacerbating stress conditions. Additionally, potassium deficiency affects the development of fruit, leading to symptoms like shriveling, which indicates that the plant is unable to transport necessary nutrients and moisture to the fruit properly.

Recognizing these symptoms can help in diagnosing potassium deficiency early, allowing for corrective measures such as the application of potassium fertilizers, ultimately improving plant health and yield.