Which of the following types of reproductive barriers separates two flowering plant species that could interbreed but for the fact that one has a deep flower tube and is pollinated by bumblebees whereas the other has a short, narrow flower tube and is pollinated by honeybees?
A) habitat isolation
B) behavioral isolation
C) mechanical isolation
D) gametic isolation

Question

Quizplus · Accepted Answer

The deep flower tube and short, narrow flower tube represent a mechanical isolation barrier, as the physical structure of the flowers prevents interbreeding between the two species. The other types of reproductive barriers listed do not directly relate to physical differences in the flowers.

Which of the Following Types of Reproductive Barriers Separates Two