General Knowledge - Biology - Discussion

Discussion :: Biology - Section 1 (Q.No.19)


Photosynthesis takes place faster in

[A]. yellow light
[B]. white light
[C]. red light
[D]. darkness

Answer: Option B


No answer description available for this question.

Divya Pandey said: (Sep 21, 2010)  
Why its white light ? why not in red light.

Devyansh said: (Dec 18, 2010)  
Photosynthesis is always fastest in blue and red light .well though white light has blue red and others of vibgyor but orange and violet decreases speed of it.

Bolu said: (Mar 18, 2011)  
If it is white light then it needs a prove although I partially agree that it is white light.

Priyanka said: (May 5, 2011)  
Why not in green light.

Gaurav said: (May 29, 2011)  
I think that the ans is red.

But if its white then I need some proof?

Tahir said: (Jun 11, 2011)  
The correct ans. is red bcoz red has the longest wavelength...but i dont think that orange and violet decreases the speed DEVYANSH....

Sravani said: (Jul 23, 2011)  
I think the answer is red followed by blue, and never in green because leaves reflect green.

Ajay Jaiswal said: (Jan 25, 2012)  
Red is correct ans...

Nadeem said: (May 16, 2012)  
I think it is white light because white light has all 7 colours red blue green yellow. etc so white light increase the photosynthesis because sun provided white light.

Subrata said: (Jul 6, 2012)  
It would be red light having reasonable wave length required for photo-oxidation.

Parish Mishra said: (Aug 28, 2012)  
Not all wavelengths of light can support photosynthesis. The photosynthetic action spectrum depends on the type of accessory pigments present. In green plants generally red n blue light needed, in red algae red, green n blue light is needed n white light is mixture of all colour so the answer should be white.

Smat said: (Sep 22, 2012)  
When we talk about plant we should consider the pigment of plant, as red can reflect red light, blue with blue. Etc so white light will be the correct answer.

Nirav said: (Oct 5, 2012)  
The red light has pick level of energy to liberate proton from chlorophyll's. The white light is not true. It is only the Red light in which the photosynthesis process becomes rapid and in the green light its become slower.

Koperunchozhan said: (Jan 15, 2013)  
Why it can't been take place in yellow light but anyway I agree it can take place in white light.

Suhana said: (May 16, 2013)  
Actually white is more attracts the sun and also doesn't reflect like other colours.

Ashu said: (May 23, 2013)  
Because white color absorbs all the light fallen on it.

Khushbu said: (Sep 30, 2013)  
Why is it white?

Jayasree said: (Dec 24, 2013)  
Photosynthesis takes place faster in white light only because it has all colours in the white light.

Hirday said: (Dec 28, 2013)  
My dear first we know about colour & it's Temperature.

Temperature Colour
30,000-60,000K blue
10,000-30,000k blue-white
7,500-10,000k white
6,000-7,500k yellow-white
5,000-6,000k yellow
3,500-5,000k orange
3,500-3,500k red

Temperature of Sun's photosphere is average about 5'773.15 - 6,273.15k is very low from blue and higher then red. photosynthesis is a process to get maximum energy by solar light. It is also dependent on producing by solar, so it is higher in white.We can show green leaf always green colour in white light. In red blue and yellow we show it dark colour.

Vaishu said: (Dec 28, 2013)  
In general, we all know that sunlight contain all VIBGYOR colour. WHITE is produced by all these 7 colors so white is correct.

Rohit said: (Mar 19, 2014)  
Because if we place a prism towards sunlight(white light) it differentiate into 7 colour called VIBGYOR.

Vaibhav Gupta said: (Mar 22, 2014)  
White light is correct answer because it is longest wavelength because it contains all the lights that have been get mp3 and all seven call alert that had.

Huma Parveen said: (May 10, 2014)  
White light is a mixture of 7 colours & a plant need all VIBGYOR colours.

Mahalaxmi said: (May 25, 2014)  
Photosynthesis is faster in green and red light if it is white I want some clear answer why it is faster in white.

Rathish said: (May 28, 2014)  
What about darkness, is it in 2nd position? or red.

Donte said: (Jun 18, 2014)  
Wouldn't darkness be the opposite of light?

Suresh Naik said: (Oct 30, 2014)  
Answer is red light because photosynthetic activity is more during this period.

Manojsheoran said: (Dec 21, 2014)  
I think red is right answer because it has longest wavelength.

Rohit Swaroop said: (Jan 9, 2015)  
Max rate of Photosynthesis is in red light, and min rate of Photosynthesis is in green please clarify it if I am wrong.

Caroline Anastasia said: (Mar 20, 2015)  
I think red is the answer. Since photosynthesis takes place in red and blue light. But I partially agree that it is white because when white light is present it not only has the red region but also has the blue.

Therefore PS rate increases when supplied with white light. So, maybe white light is the correct answer after all.

Subhradeep said: (Apr 13, 2015)  
Why no photosynthesis takes place in blue color light, and why minimum photosynthesis takes place in green color light, and Why the rate of photosynthesis is maximum in red color light?

Answer 1:

That is a great question, light is a very tricky thing as it comes in various forms of energy levels. UV light (close to purple and blue) is very high energy and that's why we get sunburned. On the other side of the spectrum is Infrared (close to red) which is seen in night vision goggles and can be seen from heat emitting from our bodies, a relatively low energy light. Plants, just like us can only tolerate certain wavelengths of light, especially for the chemical reactions of photosynthesis. Photosynthesis occurs when pigments, molecules in the plant cell, absorb light photons and transfer them around to create chemical energy. These pigments are picky in terms of which light they can use. There are two types of Chlorophyll pigments, A and B. Chlorophyll A absorbs a lot of red and some blue while Chlorophyll B absorbs a lot of blue and some red. Neither absorb green much which is why plants appear green.

Answer 2:

Chlorophyll absorbs red light. No light gets absorbed by chlorophyll means the plant can't do photosynthesis.

Answer 3:

Trees and plants are green because of a green pigment called chlorophyll. This pigment absorbs red light the best, and converts the light into energy that it uses for metabolism. As you likely know, this pigment allows plants to use light as a form of energy, as a part of a process called photosynthesis. Instead of eating food to build molecules, plants can take light from the sun and use the energy to convert carbon dioxide from the air into useful molecules! However, the pigment doesn't strongly absorb blue or green light, so plants can't use this energy for photosynthesis. Interestingly, we know this even from the color of plants! White light contains all the colors, and plants appear green because they absorb the red light, leaving what appears to us as green light, to be seen by our eyes! If the light isn't being absorbed by the plant, it can't be used for photosynthesis!

Jawalika said: (Apr 14, 2015)  
What is white light?

Rachita said: (Apr 20, 2015)  
Why not blue light?

Hanamant Hukkeri said: (May 29, 2015)  
My dear friends red and blue light is the answer.

Whatever a plant getting that is white light only in that white light contains the 7 colors those are VIBGYOR. In this situation chlorophyll will absorb the red and blue light maximum.

Dipti Dhumale said: (Jul 13, 2015)  
White colour is not included in VIBGYOR, how its white light?

Ruweida said: (Aug 11, 2015)  
My dear, yeah I agree with you white is not included in VIBGYOR. But it outgrowth of all the 7 colors. Red and blue color are needed in green plants.

So instead of individually getting red or blue color, white color suits the best as it produces both red and blue color whichever color (that is red and blue color) chlorophyll may need to absorb, its present in white color.

Hence, increasing the rate of photosynthesis.

Sanjay said: (Aug 29, 2015)  
White does not correct option I think yellow light is correct.

Kumar Akshay said: (Jan 12, 2016)  
White would be the correct answer. As white color has all the blamer series wavelengths, its efficiency would be many folds greater than red or blue alone.

Jasmine said: (Feb 7, 2016)  
Why is it white light not yellow light?

Kanha said: (Feb 16, 2016)  
So simple as along with chlorophyll a and b other accessory pigments to get excited. So max photosynthesis occur.

Subhajit Ghosh said: (Jun 17, 2016)  
No the answer is absolutely wrong. The answer will be "red light" and I have the sufficient evidence.

Chador said: (Jun 19, 2016)  
According to me, it's red light.

Aaheli Ghosh said: (Jul 2, 2016)  
In red light only ps 1 will be excited, so only cyclic pathway will be operated but in white or mixed light both ps 1 and ps 2 will be excited. So, photosynthetic yield will increase.

This is Emerson's red drop effect and enhancement effect.

Aaheli Ghosh said: (Jul 4, 2016)  
Emerson's Enhanced Effect tells us that in polychromatic light (provided in a discontinuous manner), the rate of photosynthesis increases as both PS 1 and PS 2 will be excited and hence both cyclic and non-cyclic photophosphorylation will take place. White light i.e. sunlight is a polychromatic light.

According to Emerson's Red Drop Effect if only red light i.e. Monochromatic light is provided to plants, photosynthetic yield will decrease as only PS 1 will be excited resulting in only cyclic photophosphorylation as red light has a wavelength of 700 nm at which only PS 1 is excited because PS 2 requires light of wavelength 680 nm for photoexcitation.

Rajesh Yadav said: (Aug 6, 2016)  
I think its red.

Because white light is a collection of 7 lights.

Jazuli Ishaq said: (Oct 4, 2016)  
Yes, It's white light.

Maggi Dhobale said: (Oct 16, 2016)  
In which part of the plant the maximum process photosynthesis takes place?

Kamalesh said: (Oct 18, 2016)  
Red light is the correct answer.

Sangeetha S said: (Jan 26, 2017)  
I think red is the correct answer. Because there is an experiment to check the photosynthesis is maximum with monochromatic light especially with far red and red in spectrum.

Rehan Jawalekar said: (Jan 29, 2017)  
White light has all 7 colours red blue green yellow etc. So white light increase the photosynthesis because sun provided white light.

Ajay Rattan said: (Apr 21, 2017)  
If someone has the knowledge of enhancement effect then he will come to know that although rate of photosynthesis is higher maximum in red light then followed by blue and then other colors but when they are given together the rate increases.

Interesting point is that suppose we have rate unit as simple number e.g, for red 2 and for blue 3 and when they are given together it should be 2+3=5 but interestingly it will greater than 5.
i.e, 6 or something else greater than 5 this is called enhancement effect.

Hopefully, I could explain the fact behind the answer white light is the correct answer and one-word explanation is enhancement effect.

Ajay Rattan said: (Apr 21, 2017)  
You are absolutely right @Aaheli Ghosh.

Ram said: (Jun 23, 2017)  
Rate is maximum in red light.

While photosynthesis is maximum in blue color.

Priyansh said: (Jul 22, 2017)  
The correct answer is red as photosynthesis rate is fastest in blue and red light.

Aniruddh said: (Aug 30, 2017)  
Red light is the best for plants.

Rohit Baba said: (Dec 27, 2017)  
White light is the combinataion of all lights. So white light is the right answer. It's sum of all lights.

Sarita said: (Jan 4, 2018)  
Red light is the right answer.

Sudheer said: (Mar 17, 2018)  
I think it is red light.

Ashi said: (Mar 29, 2018)  
I also think it's red.

Garima Bisen said: (Jul 20, 2018)  
Why it's white light? why not yellow or red light?

Ama Ghana said: (Jul 25, 2018)  
I think it is red light.

Ritu said: (Aug 4, 2018)  
I think in red light, the rate of photosynthesis is higher.

Ankit Patra said: (Oct 26, 2018)  
I think the red light is the correct answer.

Tani said: (Apr 3, 2019)  
I think White light is correct if white light does not come to the plants then how a plant can trap red light to do photosynthesis.

Md Samim Akhtar said: (Apr 16, 2019)  
Red light have maxi wavelength and low frequency. It's suitable for photosynthesis.

Aakash said: (Jun 7, 2019)  
As photosynthesis is maximum in case of red light. The leaves absorb the red light.

Kartik said: (Jun 29, 2019)  
I think red light will be the correct answer.

Rupal said: (Dec 16, 2019)  
White light is the correct answer.

Rupal said: (Dec 16, 2019)  
After white light, we have violet where photosynthesis occurs to a higher extent because it has the shortest wavelength.

Premchand said: (Jan 30, 2020)  
White is correct. Agree with given answer.

Ashok Behera said: (Apr 1, 2020)  
As far as the rate of photosynthesis is concerned, it is fastest in white light making the rate of photosynthesis maximum.

After White, We Have Violet Light Where Photosynthesis Occur To A Higher Extent as It Has The Shortest Wavelength Hence Has The Max Energy.

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