Question

I don't even understand this.. o-O

Answer 1

What even is this. @thomaster

Answer 2

c?? maybe??

Answer 3

I always pick c when I don't know the answer ._.

Answer 4

lol i think it might be c. i'm like 65% sure

Answer 5

Where's the other 35%? Cx

Answer 6

http://www.buzzle.com/articles/why-do-leaves-change-color.html

Answer 7

does that article say i'm right

Answer 8

It says how chlorophyll give leaves a green color and carotenoid give leaves brown colors
Has something to do with absorbing sunlight, read id :)
And yes i think it says C is correct :D

Answer 9

Mkay, now I just have to wait for my school site to stop being so slow and load already.. -_- Thanks Ari c:

Answer 10

lol you're thanking me for my 65%? you should thank thomaster :]

Answer 11

frostbite's typin. he gon tell us we're all wrong

Answer 12

I thank thomater everyday lol

Answer 13

I don't see why chlorophyll should be converted into carotenoids. Carotenoids are extended polyenes that absorb light between 400 and 500 nm. The carotenoids are responsible for the most of the yellow and red colours of fruits and flowers yes and they provide the brilliance of fall when the chlorophyll molecules degrade and then revealing the carotenoids (as the article say).
And this is why I don't see why they are converted:
The 26-kd subunit of the light harvesting complex (LHC-II) is the most abundant membrane protein in the chloroplasts. That subunit bind 7 chlorophyll a molecules, 6 chlorophyll molecules and two carotenoid molecules, so how would such a conversion be done?

Answer 14

So what would be the correct answer then?
I have no idea what Pf or Pfr are :P

Answer 15

No idea too :P but could guess it might be a excited state for the special pair :P

Answer 16

Kitt020912 you know what the weird p thingy means? :)

Answer 17

Phytochrome?

Answer 18

Phytochromes adopt two different states, termed Pr and Pfr. The Pr state is best at absorbing red light, which is found in full-sun conditions. When it absorbs red light, phytochrome converts to the Pfr state, which is better at absorbing far-red light. Far-red light is more indicative of shade, which is typically depleted of red light. The Pfr state can then convert back to the Pr state either by absorbing far-red light, or if it is in the dark for a while, by slow thermal conversion. Thus, this switch between Pr and Pfr states allows the plant to see if it is in the sun or the shade.

http://sbkb.org/kb/archives.jsp?pageshow=25

Answer 19

So I was right?

Answer 20

Well I would say the answer should be A.
Plants synthesize phytochrome as Pr, and if the seeds are kept in the dark, the pigment remains almost entirely in the Pr form. Sunlight contains both red light and far-red light, but the conversion to Pfr is faster than the conversion to Pr. Therefore, the ratio of Pfr to Pr should increase in the sunlight. When the seeds are exposed to adequate sunlight, the production and accumulation of Pfr will trigger their germination.

Answer 21

@thomaster do you agree? :)

Answer 22

yes :)

Answer 23

Cool :D

Answer 24

Well, the course player crashed.. So now I have to wait for tech support to fix it..

Answer 25

Sucks. :/

Answer 26

Omg -_-