Question

Rocky Mountain juniper (Juniperus scopulorum) and one-seeded juniper (J. monosperma) have overlapping ranges. Pollen grains (which contain sperm cells) from one species are unable to germinate and make pollen tubes on female ovules (which contain egg cells) of the other species These two juniper species are kept separate by:______
a. temporal isolation
b. habitat isolation
c. behavioral isolation
d. gametic isolation

Answer 1

Answer:

Option B

Explanation:

Both the species of juniper, in this case, belong to the same class but they do not interbreed because of differences in their behavior. These two classes of organisms live in nearly the same environment and are geographically not restricted from mating, yet they do not interbreed. Such organisms develop behavioral differences between them and prefer to remain in their own sphere and mate among themselves only  

Hence, option B is correct