Fall-planted crops often have high sugar content because

• A. Most vegetable crops grow best in cooler temperatures
• B. Warm days and cool nights add sugar and crispness to vegetables
• C. Fall-planted crops do not need fertilizer
• D. The vegetables are planted twice as deep for warmth

Answer: (B)

Fall crops end up sweeter because of the day-night temperature pattern they experience. Warm daytime temperatures keep photosynthesis active, so the plants keep producing sugars. Cool nights slow the plant’s respiration, which is the process that normally uses up those sugars for energy. When respiration slows, more of the sugars stay in the edible tissue, boosting sweetness and often crispness.

So the combination of sunny, warm days and cool nights lets the plant build sugars during the day and conserve them at night, enhancing flavor and texture. The other statements don’t capture this interaction—the effect isn’t due to fertilizer, planting depth, or simply cooler temperatures alone.