General Knowledge - Biology - Discussion

I think its red.

Because white light is a collection of 7 lights.

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.

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.

According to me, it's red light.

No the answer is absolutely wrong. The answer will be "red light" and I have the sufficient evidence.

So simple as along with chlorophyll a and b other accessory pigments to get excited. So max photosynthesis occur.

Why is it white light not yellow light?

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.

White does not correct option I think yellow light is correct.

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.