A bee will pollinate a flower if it moves pollen from

A. The filament to the style
B. The anther to the stigma
C. The pistil to the stamen
D. The sepal to the pedicel

B. The anther to the stigma

A bee will pollinate a flower if it moves pollen from:

B. The anther to the stigma

The correct answer is B. The anther to the stigma.

To understand why the correct answer is B, we need to understand the parts of a flower involved in pollination.

In a typical flower, the male reproductive part is called the stamen, which consists of the filament and the anther. The anther is the part of the stamen where pollen is produced. The female reproductive part is called the pistil, which consists of the stigma, style, and ovary. The stigma is located at the top of the pistil and is where pollen germination occurs.

For pollination to occur, the pollen needs to be transferred from the male reproductive organs (anthers) to the female reproductive organ (stigma). Bees are one of the major pollinators and play a significant role in this process.

When a bee lands on a flower, it can unintentionally pick up pollen grains from the anthers. As the bee moves around to other flowers, it brushes against the stigma of another flower, thereby transferring pollen to the stigma. This transfer of pollen from the anther to the stigma is known as cross-pollination.

In this scenario, the correct answer is B. The bee will pollinate a flower if it moves pollen from the anther to the stigma. The other choices (A, C, and D) involve incorrect combinations of flower parts and do not describe the process of pollination.