Certified Crop Advisor Practice Exam

In many crops, night temperatures are important in triggering _______________.

1. germination

2. flowering

3. root growth

4. nutrient uptake

The correct answer is: flowering

Night temperatures play a critical role in the flowering process of many crops. For several plant species, including some fruits and vegetables, the transition from vegetative growth to flowering is influenced significantly by temperature fluctuations, particularly the contrast between daytime and nighttime temperatures. Cooler night temperatures can promote the physiological changes necessary for flower development, facilitating the plant's ability to initiate flowering at the right time, which is essential for maximizing yield. In contrast, germination primarily relies on adequate moisture and warmth rather than specific night temperature conditions. Root growth is influenced by soil temperature and moisture availability but is not directly triggered by night temperatures. Nutrient uptake is closely related to root activity and overall plant health and is affected by multiple factors including soil moisture, temperature, and root development rather than specific nighttime temperature conditions alone. Therefore, the correct answer highlights the importance of night temperatures in the flowering process of crops.