The reaction-center chlorophyll of photosystem i is known as p700 because
a) there are 700 chlorophyll molecules in the center
b) this pigment isbest at absorbing light with a wavelength of 700 nm.
c) there are 700 photosystem i components to each chloroplast.
d) it absorbs 700 photons per minute

The correct answer will be option-B.

Explanation:

Photosystem of a plant is complex pigment-protein molecules which absorbs the light energy required for the formation of a glucose molecule.

Two types of Photosystem are present in the plants which are: P₆₈₀ and P₇₀₀. The 680 and 700 denote the wavelength of the light energy absorbed by the pigment of the chloroplast. The electrons get excited only at their absorbing wavelength.

Thus, Option-B is the correct answer.

layer 3 is younger than layer 6.