In the absence of honey bees, the yield of sunflower goes down tremendously.

Ans. 1. Sunflower pollen is heavy and sticky. So it cannot be carried by wind. 2. So, pollen is transferred from one plant to another plant through the agency of honey bees resulting in cross pollination. 3. Cross pollination also increases the yield of seeds. 4. Therefore, in the absence of honey bees, the yield of sunflower goes down tremendously