Question

The wavelength of light most absorbed during photosynthesis is
(a) 700 nm
(b) 660 nm
(c) 550 nm
(d) 400 nm

Answer 1

Dear Student,

◆ Answer -

The wavelength of light most absorbed during photosynthesis is 660 nm.

● Explaination -

Chlorophylls absorb maximum light between the wavelength of 450-475 nm and 650-675 nm.

◆ Extra information -

• Chlorophyll is the green-colored pigment which absorbs light for photosynthesis in plants.
• It is considered to be primary pigment and is available in two forms chlorophyll a & chlorophyll b.
• Some other imp pigments include carotenoids, anthocyanins, xanthophylls, etc.

Thanks dear. Hope this helps you...

Answer 2

The ‘wavelength’ of light most absorbed during ‘photosynthesis’ is 660 nm.

Option: (b)

Explanation:  

• The chemical present in the ‘leaves’ for capturing of sunlight is known as chlorophyll.  

• The chlorophyll gets excited by only a certain light of the ‘visible spectrum’ that is blue and red light.  

• Now red light has a lower source of energy, since energy is inversely proportional to wavelength. Now red light has a wavelength of 660 nm and blue light has 440 nm.  

• So, the amount of energy is sufficient to excite the electron present in chlorophyll to a higher orbit.