Login

Join for Free!
118820 members


Why are leaves green?

Plants!

Moderator: BioTeam

Postby Linn » Mon Jul 24, 2006 12:35 pm

normal that plants " want" as much energy from the sun as possible. Now if all that`s right, than why are they reflecting the most valuable wavelengths of the suns light-rays? Other words WHY ARE THEY GREEN?



I dont really understand this myself. YET :lol:
This is hard to understand and explain. :?

It has to do with the pigments absorbtion spectrum that is for that type of plant. as well as different arrangments

I expect that it has something also to do with plants becoming darker or different colored in lower light or deep shade. perhaps to do with carbon/oxygen ratio?

Most plants chlorophyll is green so obviously that is a factor :roll: Then you have red and purple plants which reflect those colors.. :idea:

I will have to do some googling i guess or text book reads. :D
"How far you go in life depends on your being tender with the young, compassionate with the aged, sympathetic with the striving and tolerant of the weak and strong. Because someday in life you will have been all of these".

~ George washington Carver
User avatar
Linn
King Cobra
King Cobra
 
Posts: 1735
Joined: Sun Jan 22, 2006 3:53 am
Location: Massachusetts, USA

Postby MrMistery » Mon Jul 24, 2006 8:35 pm

aaahhh... the ultimate question in botany. Eventually comes down to why are plants green?
Well, the answer is very complex actually. plants are green because chlorophyll reflects green light and absorbes red and blue light. But why does it work like that? The answer- evolution. During the day, in bright sunlight it doesn't matter what the absorbtion spectrum is, because all colors are present. But in the morning and in the evening red light is present as the majority of photons making up the spectrum of the sun. And blue light? Well, since the energy of blue light is the highest, blue light is the only one that can pass through clouds. So you see, it is very important for plants to be green.
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter
User avatar
MrMistery
Inland Taipan
Inland Taipan
 
Posts: 6832
Joined: Thu Mar 03, 2005 10:18 pm
Location: Romania(small and unimportant country)

Postby Linn » Fri Jul 28, 2006 3:59 pm

MrMistery wrote:aaahhh... the ultimate question in botany. Eventually comes down to why are plants green?
Well, the answer is very complex actually. plants are green because chlorophyll reflects green light and absorbes red and blue light. But why does it work like that? The answer- evolution. During the day, in bright sunlight it doesn't matter what the absorbtion spectrum is, because all colors are present. But in the morning and in the evening red light is present as the majority of photons making up the spectrum of the sun. And blue light? Well, since the energy of blue light is the highest, blue light is the only one that can pass through clouds. So you see, it is very important for plants to be green.


I must save this answer for my notes you explained it well :)
"How far you go in life depends on your being tender with the young, compassionate with the aged, sympathetic with the striving and tolerant of the weak and strong. Because someday in life you will have been all of these".

~ George washington Carver
User avatar
Linn
King Cobra
King Cobra
 
Posts: 1735
Joined: Sun Jan 22, 2006 3:53 am
Location: Massachusetts, USA


Postby MrMistery » Sat Jul 29, 2006 8:11 pm

Glad to be of some help. This is the question i ask teachers when i want to humiliate them :lol:
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter
User avatar
MrMistery
Inland Taipan
Inland Taipan
 
Posts: 6832
Joined: Thu Mar 03, 2005 10:18 pm
Location: Romania(small and unimportant country)

Postby Linn » Mon Jul 31, 2006 11:15 pm

Ya I found out that there is a lot not yet understood in botany. Things my professor couldnt answer.
"How far you go in life depends on your being tender with the young, compassionate with the aged, sympathetic with the striving and tolerant of the weak and strong. Because someday in life you will have been all of these".

~ George washington Carver
User avatar
Linn
King Cobra
King Cobra
 
Posts: 1735
Joined: Sun Jan 22, 2006 3:53 am
Location: Massachusetts, USA

Postby biology_rox_my_jox » Tue Aug 08, 2006 12:25 am

because god made them that way...gees
biology is the study of living things
biology_rox_my_jox
Garter
Garter
 
Posts: 2
Joined: Mon Aug 07, 2006 1:25 am
Location: my pc lol

Postby canalon » Tue Aug 08, 2006 2:09 am

biology_rox_my_jox wrote:because god made them that way...gees


Interesting answer, but do you have more scientific background and experiments to back up your quite short explanation?
Patrick

Science has proof without any certainty. Creationists have certainty without
any proof. (Ashley Montague)
User avatar
canalon
Inland Taipan
Inland Taipan
 
Posts: 3909
Joined: Thu Feb 03, 2005 2:46 pm
Location: Canada

Postby MrMistery » Tue Aug 08, 2006 5:55 pm

Thank you for enlightening me.
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter
User avatar
MrMistery
Inland Taipan
Inland Taipan
 
Posts: 6832
Joined: Thu Mar 03, 2005 10:18 pm
Location: Romania(small and unimportant country)

Postby efendy » Thu Aug 17, 2006 4:38 am

I dont think that more answers are needed since chris4 explained it very well subsequently.
But, as an addition, energy at around 380 nm is 3.1 electron volt whereas it is around 1.8 eV at above 700 nm. This proves that violet - blue range is the most energetic in visible region.
cheers
efendy
Garter
Garter
 
Posts: 1
Joined: Thu Aug 17, 2006 4:25 am

Postby MrMistery » Thu Aug 17, 2006 6:35 pm

yes it is, but it does not matter. The plant can gain the same amount of energy from any photon, regardless of the actual energy it has. That is why blue light is said to be used by plants most ineficiently. Because blue light has a high energy, and the plant takes only a small part of it.
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter
User avatar
MrMistery
Inland Taipan
Inland Taipan
 
Posts: 6832
Joined: Thu Mar 03, 2005 10:18 pm
Location: Romania(small and unimportant country)

Re: Why are leaves green?

Postby diamndprncss » Wed Jul 23, 2008 6:26 pm

Leaves on green because the sky is blue.
diamndprncss
Garter
Garter
 
Posts: 1
Joined: Wed Jul 23, 2008 6:23 pm

Postby MrMistery » Wed Jul 23, 2008 7:42 pm

Brilliant!
"As a biologist, I firmly believe that when you're dead, you're dead. Except for what you live behind in history. That's the only afterlife" - J. Craig Venter
User avatar
MrMistery
Inland Taipan
Inland Taipan
 
Posts: 6832
Joined: Thu Mar 03, 2005 10:18 pm
Location: Romania(small and unimportant country)

PreviousNext

Return to Botany Discussion

Who is online

Users browsing this forum: No registered users and 1 guest