What is a primary crop that relies heavily on bee pollination?

Almonds are a primary crop that relies heavily on bee pollination due to the unique requirements of almond trees. They are not able to self-pollinate and require pollinators, particularly honeybees, to transfer pollen between flowers for successful fertilization and fruit set. This dependency is particularly pronounced in California, where a significant portion of the world's almond supply is produced, and where beekeepers often transport hives to almond orchards during the bloom season to ensure adequate pollination.

In contrast, while apples and blueberries also benefit from bee pollination, their level of dependency is less critical than that of almonds. Many varieties of apples can achieve some level of pollination through wind or self-pollination, and blueberries can also be pollinated by various other insects along with bees. Wheat, on the other hand, is primarily wind-pollinated and does not require bees for pollination, making it the least connected to bee activity among the options listed.