In some species of flowering plants,pollen from unrelated species may germinate on the female stigma,but the pollen tube grows only a short distance and fertilization does not occur.This is an example of ___ isolation.
A) species
B) temporal
C) behavioral
D) ecological
E) mechanical

Question

Quizplus · Accepted Answer

This is an example of mechanical isolation, where the structures of the reproductive organs prevent successful fertilization between unrelated species. In this case, the pollen tube is unable to penetrate the female's reproductive structures and reach the egg, preventing fertilization.

In Some Species of Flowering Plants,pollen from Unrelated Species May