Question 1

B) A bee transfers pollen between the flowers of different plants of the same species.

Sexual reproduction involves the combination of genetic material from two different individuals, typically leading to offspring that are genetically distinct from their parents. The transfer of pollen by a bee between flowers of different plants exemplifies this process, as it facilitates fertilization and the creation of seeds, which is a hallmark of sexual reproduction.

A) A single bacterium increases in size and divides into two bacteria.

This option describes a process known as binary fission, which is an asexual method of reproduction. In binary fission, a single organism replicates its genetic material and divides into two identical offspring, without the involvement of genetic exchange from another organism.

C) A small bud forms on a yeast cell, slowly grows, and separates from the original cell.

This scenario illustrates budding, which is another form of asexual reproduction. In budding, a new organism develops from an outgrowth or bud on the parent cell and eventually detaches, resulting in genetically identical offspring rather than the combination of genetic materials from two different parents.

D) A flatworm's body fragments into different parts, which all become fully formed adults.

This option refers to a form of asexual reproduction known as fragmentation. In this process, parts of the flatworm can regenerate into complete organisms, again producing offspring that are clones of the original organism rather than the result of sexual reproduction involving genetic mixing.

Conclusion

Option B is definitively correct as it accurately represents sexual reproduction through the transfer of pollen, which is essential for fertilization and genetic diversity. In contrast, options A, C, and D describe various asexual reproductive strategies, each resulting in offspring that are genetically identical to the parent, demonstrating why they do not illustrate sexual reproduction.