AP BIOLOGY

Detailed explanation-1: -In photosystem l, the reaction centre has an absorption peak at 700 nm (red light), hence is called P700 and in PS ll, the reaction centre has an absorption peak at 680 nm (red light), hence is called P680.

Detailed explanation-2: -This species is vital due to its ability to absorb light energy with a wavelength approximately between 430 nm-700 nm, and transfer high-energy electrons to a series of acceptors that are situated near it.

Detailed explanation-3: -In Photosystem I (PS I) long-wavelength chlorophylls (LWC) of the core antenna are known to extend the spectral region up to 750 nm for absorbance of light that drives photochemistry.

Detailed explanation-4: -PS I is the system where the chlorophyll and other pigments get collected and absorb the wavelength of light at 700nm.

Detailed explanation-5: -the absorption peak of ps1 and ps2 is 700nm and 680 nm respectively, which is close to the wavelength of red light .