Question 2 of 9 Corn seeds were germinated (grew and put out shoots after a period of dormancy) in a dark room

placed in the light, 75 of these seedlings turned green. Which conclusion about chlorophyll (the

plants can most reasonably be drawn from this information?

(1 point)

DA. Light is the only factor that controls the production of chlorophyll

.

B. Darkness is the only factor that prevents the production of chlorophyll.

IC Light and vitamins are necessary for chlorophyll production.

D. Light and some other factor are necessary for chlorophyll production.

Page 2 of 9

What does it mean for a cell membrane to be selectively permable

Which of the following sex and generation combinations directly produces the pollen tube of angiosperms? a) male gametophyteb) female gametophytec) male sporophyted) female sporophyte

To answer this question, researchers studied populations of the dusky salamander (desmognathus ochrophaeus) living on different mountain ranges in the southern appalachian mountains. the researchers tested the reproductive isolation of pairs of salamander populations by leaving one male and one female together and later checking the females for the presence of sperm. four mating combinations were tested for each pair of populations (a and b)—two within the same population (female a with male a and female b with male b) and two between populations (female a with male b and female b with male a). the proportion of successful matings for each mating combination was measured. for example, when all the matings of a particular combination were successful, the researchers gave it a value of 1; when none of the matings were successful, they gave it a value of 0. then the researchers calculated an index of reproductive isolation that ranged from 0 (no isolation) to 2 (full isolation). the reproductive isolation value for two populations is the sum of the proportion of successful matings of each type within populations (aa + bb) minus the sum of the proportion of successful matings of each type between populations (ab + ba). the table provides data for the geographic distances and reproductive isolation values for 27 pairs of dusky salamander populations.