Biochemical recognition systems within the stigma of a flowering plant prevent the pollen from a different species from developing a pollen tube and fertilizing its eggs. This is an example of what kind of reproductive isolation?
A)pre-zygotic, behavioral isolation
B)pre-zygotic, temporal separation
C)pre-zygotic, lock and key
D)post-zygotic, temporal separation
E)post-zygotic, ecological separation

Question

Quizplus · Accepted Answer

Biochemical recognition systems within the stigma of a flowering plant preventing the pollen from a different species from developing a pollen tube and fertilizing its eggs is an example of pre-zygotic isolation. It is specifically an example of lock and key, where the biochemical recognition systems act as a lock and the pollen must have a specific "key" (compatible molecules) to fertilize the egg.

Biochemical Recognition Systems Within the Stigma of a Flowering Plant